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摘要 ：
In this study, we investigated the microstructures and mechanical properties of Mg-6Gd-1Er-0.5Zr (GE61K) sheets. The results show that the rolling temperature has a remarkable influence on microstructures, age-hardening responses and mechanical properties of GE61K sheets. The microstructures varies with the increase in rolling temperatures, i.e. microstructures were dominated by the mixture of dynamic re-crystallized (DRXed) grains and un-DRXed grains at 300 degrees C, by DRXed grains at 350 degrees C, and by un-DRXed grains at 400 degrees C and 450 degrees C. Rolling at 300 degrees C leads to a formation of the bimodal microstructure which contains equilibrium Mg-5(Gd, Er) precipitates and a large number of dislocations. These dislocations leads to a formation of novel chain-like precipitates which comprise dominant beta', beta'(F) (or beta'(T)), tail-like "hexagonal ring" layers, individual "zig-zag" chain and individual "hexagonal ring", eventually improving age-hardening responses. The chain-like precipitates are beneficial for achieving a good strength-ductility balance by dividing the matrix into nano-scale units and forming subsequent honeycomb structures. As a result, the R-300 degrees C sheet shows good mechanical properties, i.e. ultimate tensile strength (UTS) of 367 +/- 3 MPa, yield strength (YS) of 349 +/- 4 MPa and elongation (EL) of 9.1 +/- 1.5%, respectively. However, such strength-ductility balance is destroyed sharply as soon as the rolling temperature increases to 400 degrees C because of the microstructure variations. (C) 2021 Elsevier B.V. All rights reserved.
关键词 ：
Age-hardening response Age-hardening response Mechanical properties Mechanical properties Mg-Gd-Er-Zr sheets Mg-Gd-Er-Zr sheets Precipitate chain Precipitate chain
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| GB/T 7714 | Liu, Ke , Lou, Feng , Yu, Zijian et al. Microstructures and mechanical properties of Mg-6Gd-1Er-0.5Zr alloy sheets produced with different rolling temperatures [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 893 . |
| MLA | Liu, Ke et al. "Microstructures and mechanical properties of Mg-6Gd-1Er-0.5Zr alloy sheets produced with different rolling temperatures" . | JOURNAL OF ALLOYS AND COMPOUNDS 893 (2022) . |
| APA | Liu, Ke , Lou, Feng , Yu, Zijian , Wang, Zhaohui , Li, Shubo , Du, Xian et al. Microstructures and mechanical properties of Mg-6Gd-1Er-0.5Zr alloy sheets produced with different rolling temperatures . | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 893 . |
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摘要 ：
Magnesium alloys have attracted significant attention due to their excellent characteristics, such as low density, high specific strength, high thermal conductivity, and superior damping ability. The prominent advantages of using magnesium-alloy parts are environmental protection, energy conservation, and emission reduction, especially forged magnesium-alloy parts, which are used to reduce the weight of equipment in transportation and aerospace fields. Presently, there are relatively few investigations on the forged Mg-RE alloys. Based on Mg-Gd binary alloy, a series of Mg-Gd-Er-Zr alloys were developed, exhibiting excellent room-temperature mechanical properties and high-temperature creep resistance. In this study, the Mg-8Gd-1Er-0.5Zr (mass fraction, %) alloy was conducted using a multidirectional forging (MDF) at a high strain rate. The microstructure and texture evolution in various accumulated strains (Sigma Delta epsilon) were examined, and their effects on the mechanical properties of the alloy were discussed. The results showed that the {10 (1) over bar2} extension twinning was activated within most grains in the early stage of forging. With an increase in Sigma Delta epsilon, the area fraction of twin decreases, while the area fraction of recrystallization increases. Continuous dynamic recrystallization (CDRX) was the dominant mechanism, supplemented by discontinuous dynamic recrystallization (DDRX) and twin-induced recrystallization (TDRX). The grain refinement was attributed to the twin-breaking, and the grain size decreased from 33.0 mm to 13.1 mu m when Sigma Delta epsilon was less than 1.32. However, it was attributed to the dynamic recrystallization, and the grain size was further refined to 4.2 mu m when Sigma Delta epsilon was greater than 1.32. As Sigma Delta epsilon increases, the texture of the alloy changed from basal to double-peak texture, and its intensity increased. When Sigma Delta epsilon = 0.66, the tensile strength, yield strength, and elongation at room-temperature of the MDFed-alloy reached 295 MPa, 252 MPa, and 13.8%, respectively, which were 80%, 157%, and 13.1% higher than those of the assolution state.
关键词 ：
grain refinement grain refinement mechanical property mechanical property Mg-Gd-Er-Zr alloy Mg-Gd-Er-Zr alloy multi-directional forging multi-directional forging texture texture twinning twinning
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| GB/T 7714 | Ding Ning , Wang Yunfeng , Liu Ke et al. Microstructure, Texture, and Mechanical Properties of Mg-8Gd-1Er-0.5Zr Alloy by Multi-Directional Forging at High Strain Rate [J]. | ACTA METALLURGICA SINICA , 2021 , 57 (8) : 1000-1008 . |
| MLA | Ding Ning et al. "Microstructure, Texture, and Mechanical Properties of Mg-8Gd-1Er-0.5Zr Alloy by Multi-Directional Forging at High Strain Rate" . | ACTA METALLURGICA SINICA 57 . 8 (2021) : 1000-1008 . |
| APA | Ding Ning , Wang Yunfeng , Liu Ke , Zhu Xunming , Li Shubo , Du Wenbo . Microstructure, Texture, and Mechanical Properties of Mg-8Gd-1Er-0.5Zr Alloy by Multi-Directional Forging at High Strain Rate . | ACTA METALLURGICA SINICA , 2021 , 57 (8) , 1000-1008 . |
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摘要 ：
In this study, the Mg-4Y-1Gd-1Nd-xCa-1Zn-0.3Zr (x = 0 and 0.4 wt%) cast alloys with low rare earth concentration were prepared in different routes of heat treatments, and their microstructures and mechanical properties were investigated. The Mg-4Y-1Gd-1Nd-1Zn-0.4Ca-0.3Zr cast alloy with ultimate tensile strength (UTS) of 264 +/- 7.8 MPa, tensile yield strength (TYS) of 153 +/- 1.2 MPa and elongation to failure (EL) of 17.2 +/- 1.2% was successfully developed by appropriate heat treatment. The improved mechanical performance was attributed to the combined strengthening effects of fine grains, -Mg24RE5, beta', beta(1), gamma' and LPSO phases. In the heat treatment process, cooling method of T4 treatment affected the microstructure, which consequently determined the mechanical properties air cooling, rather than water cooling, gave rise to the formation of gamma' phase in the alloy without Ca addition. However, Ca addition facilitated the formation of gamma' phase, and the gamma' phase precipitated in the alloy after T4 treatment either by water cooling or by air cooling, but the air cooling increased the number density of gamma' phase in comparison to the water cooling. Although the gamma' phase strengthened the studied alloys, the formation of gamma' phase inhibited the precipitatition of beta' and beta(1) phases in the following T6 treatment, and consequently reduced the strengthening effect of beta' and beta(1) phases. The results showed that the mechanical performance of the studied alloys was largely determined by the precipitation of gamma' phase, which was regulated by the Ca addition and the cooling method of T4 treatment.
关键词 ：
Heat treatment Heat treatment Magnesium alloy Magnesium alloy Mechanical properties Mechanical properties Microstructure Microstructure Rare earth Rare earth
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| GB/T 7714 | Yu, Zijian , Xu, Xi , Du, Baotian et al. Precipitate Characteristics and Mechanical Performance of Cast Mg-6RE-1Zn-xCa-0.3Zr (x=0 and 0.4 wt%) Alloys [J]. | ACTA METALLURGICA SINICA-ENGLISH LETTERS , 2021 . |
| MLA | Yu, Zijian et al. "Precipitate Characteristics and Mechanical Performance of Cast Mg-6RE-1Zn-xCa-0.3Zr (x=0 and 0.4 wt%) Alloys" . | ACTA METALLURGICA SINICA-ENGLISH LETTERS (2021) . |
| APA | Yu, Zijian , Xu, Xi , Du, Baotian , Shi, Kang , Liu, Ke , Li, Shubo et al. Precipitate Characteristics and Mechanical Performance of Cast Mg-6RE-1Zn-xCa-0.3Zr (x=0 and 0.4 wt%) Alloys . | ACTA METALLURGICA SINICA-ENGLISH LETTERS , 2021 . |
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摘要 ：
In this study, a high-performance Mg-8Gd-2Y-1Zn-6Li (wt%) alloy having a TYS of 202 +/- 2.6 MPa, UTS of 243 +/- 2.1 MPa and EL of 10.7 +/- 2.3% was successfully fabricated by casting, heat treatment and hot extrusion. The effects of intermetallic compounds on microstructure and mechanical properties were deeply investigated. The results show that the studied alloy consists of coarse deformed alpha-Mg grains with (0001) basal texture, fine recrystallized beta-Li grains with (002) texture and three Mg3RE phase variants, which are bulk Mg3RE phase with a size range of 10-30 mu m, spot Mg3RE phase with a size range of 1-2 mu m and spherical Mg3RE phase with a size range of 0.3-1 mu m, respectively. The spherical Mg3RE phase has a strong dispersion strengthening effect, while the bulk Mg3RE phase acts as crack resources and deteriorates the ductility. A novel island like beta(1R) phase (FCC, a = 0.78 nm) is found for the first time in the Mg-Gd-Li based alloys. It has a coherent ((1) over bar 12)beta(1R//)(10 (1) over bar0)(alpha) interface at the broad facet and a semi-coherent ((1) over bar 11)beta(1R)//(11 (2) over bar0)alpha interface at the end facet. The beta(1R) phase transforms from beta(H) phase at the semi-coherent interface by atomic shear of RE and Mg atoms. The beta(1R) phase provides a significant precipitation strengthening effect to the studied alloy, while the dissolution of beta(1R )phase results in the age-softening phenomenon. The high-performance of the studied alloy is mainly attributed to the alpha/beta( )duplex structure, three Mg3RE phase variants, and beta(1R )phase. (C) 2021 Elsevier B.V. All rights reserved.
关键词 ：
Hot extrusion Hot extrusion Intermetallic compounds Intermetallic compounds Mechanical properties Mechanical properties Mg-Li alloys Mg-Li alloys
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| GB/T 7714 | Yu, Zijian , Liu, Linlin , Mansoor, Adil et al. Microstructures and mechanical properties of as-extruded Mg-8Gd-2Y-1Zn-6Li alloy [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 864 . |
| MLA | Yu, Zijian et al. "Microstructures and mechanical properties of as-extruded Mg-8Gd-2Y-1Zn-6Li alloy" . | JOURNAL OF ALLOYS AND COMPOUNDS 864 (2021) . |
| APA | Yu, Zijian , Liu, Linlin , Mansoor, Adil , Liu, Ke , Li, Shubo , Du, Wenbo . Microstructures and mechanical properties of as-extruded Mg-8Gd-2Y-1Zn-6Li alloy . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 864 . |
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摘要 ：
In electromagnetic (EM) optimization of microwave design, a computationally bad starting point usually leads the local optimization process to be stuck into local optimum, which does not satisfy the design specifications. In this situation, global optimization methods can be an alternative to achieve the final optimal solution. However, global optimization methods always suffer from a relatively low convergence rate. To address this problem, we propose an efficient EM optimization technique with a novel parallel local sampling strategy and Bayesian optimization (BO) for microwave applications in this article. We develop a new parallel local sampling strategy to increase the exploitation ability near the potential optimal solution in each optimization iteration and improve the convergence of the entire optimization process. The local sampling range in each iteration is determined based on the derivative information of the current potential optimal solution. While conventional BO only uses the information of potential optimal solutions in each iteration during optimization, we propose to exploit both the generated local samples and the potential optimal solutions together to build a surrogate model and guide the optimization. Therefore, the exploration and exploitation during the proposed EM optimization are well balanced, and the entire EM optimization process is effectively accelerated in comparison to other existing global methods. Examples of EM optimizations of microwave components are used to demonstrate the proposed technique.
关键词 ：
Bayesian optimization (BO) Bayesian optimization (BO) Bayes methods Bayes methods Data models Data models electromagnetic (EM) optimization electromagnetic (EM) optimization microwave applications microwave applications Microwave theory and techniques Microwave theory and techniques Optimization Optimization Optimization methods Optimization methods parallel local sampling parallel local sampling Probabilistic logic Probabilistic logic Wireless communication Wireless communication
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| GB/T 7714 | Na, Weicong , Liu, Ke , Cai, Haocheng et al. Efficient EM Optimization Exploiting Parallel Local Sampling Strategy and Bayesian Optimization for Microwave Applications [J]. | IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS , 2021 , 31 (10) : 1103-1106 . |
| MLA | Na, Weicong et al. "Efficient EM Optimization Exploiting Parallel Local Sampling Strategy and Bayesian Optimization for Microwave Applications" . | IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS 31 . 10 (2021) : 1103-1106 . |
| APA | Na, Weicong , Liu, Ke , Cai, Haocheng , Zhang, Wanrong , Xie, Hongyun , Jin, Dongyue . Efficient EM Optimization Exploiting Parallel Local Sampling Strategy and Bayesian Optimization for Microwave Applications . | IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS , 2021 , 31 (10) , 1103-1106 . |
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摘要 ：
In this work, a high-performance Mg-8.4Gd-4.4Li-3.5Y-1.4Zn (wt%) alloy was successfully prepared by low-temperature hot extrusion. The studied alloy has a TYS of 295 ± 1 MPa and an EL of 2.5 %±0.2 % at room temperature, 159 ± 8 MPa and 15.9 %±1.4 % at 150 °C, and 143 ± 4 MPa and 19.8 %±1.8 % at 200 °C. The high performance at temperatures up to 200 °C is attributed to the dispersion strengthening of three Mg3RE phase variants, the solid solution strengthening of alloying elements and the bimodal structure consisting of fine DRXed grains with random texture and coarse un-DRXed grains with basal texture. A novel island shaped β1R phase (FCC, a = 0.78 nm) with a size of 30 nm–100 nm is observed in the studied alloy. The β1R phase precipitates on the {11¯00}α prismatic planes. The strain-induced, dislocation-assisted dynamic precipitation during low-temperature hot extrusion is responsible for the formation of the β1R phase. The growth of the β1R phase is owing to the aid of the formation and transformation of zig-zag structures. The basal slip of dislocations is the dominate deformation mechanism of the studied alloy in the early stage of tensile deformation at room temperature, while non-basal slip of and dislocations at 200 °C. Due to the strong interaction between β1R precipitates and dislocations, the densely distributed β1R precipitates significantly improve the mechanical properties via the Orowan strengthening both at room temperature and elevated temperatures. © 2021
关键词 ：
Alloying elements Alloying elements Deformation Deformation Extrusion Extrusion Gadolinium alloys Gadolinium alloys Lithium alloys Lithium alloys Magnesium alloys Magnesium alloys Metallographic microstructure Metallographic microstructure Precipitation (chemical) Precipitation (chemical) Temperature Temperature Tensile strength Tensile strength Textures Textures Zinc alloys Zinc alloys
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| GB/T 7714 | Yu, Zijian , Xu, Xi , Mansoor, Adil et al. Precipitate characteristics and their effects on the mechanical properties of as-extruded Mg-Gd-Li-Y-Zn alloy [J]. | Journal of Materials Science and Technology , 2021 , 88 : 21-35 . |
| MLA | Yu, Zijian et al. "Precipitate characteristics and their effects on the mechanical properties of as-extruded Mg-Gd-Li-Y-Zn alloy" . | Journal of Materials Science and Technology 88 (2021) : 21-35 . |
| APA | Yu, Zijian , Xu, Xi , Mansoor, Adil , Du, Baotian , Shi, Kang , Liu, Ke et al. Precipitate characteristics and their effects on the mechanical properties of as-extruded Mg-Gd-Li-Y-Zn alloy . | Journal of Materials Science and Technology , 2021 , 88 , 21-35 . |
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摘要 ：
The influence of primary and secondary extrusion on the microstructure and mechanical properties of the Mg-12Gd-2Er-0.4Zr alloy was investigated. After the primary extrusion, incomplete dynamic recrystallization (DRX) had led to the formation of non-homogenous grain structure with fine equiaxed grain and coarse grains, while the secondary extrusion refined the microstructure remarkably and further improved the mechanical properties. Moreover, the secondary phases were broken into small particles and distributed along the extrusion direction (ED). The secondary extruded (EX2) alloy had the smallest grain size similar to 3.0 mu m and exhibited the best balance of strength and elongation (ultimate tensile strength (UTS) of 305 +/- 5.7 MPa, tensile yield strength (TYS) of 258 +/- 10 MPa, and elongation (EL) of 31 +/- 2.4%). The excellent EL was mainly ascribed to the fully refined dynamic recrystallized (DRXed) grains after the secondary extrusion. Furthermore, the aged EX2 alloy (AEX2) exhibited an excellent balance of strength and elongation (TYS of 382 +/- 11 MPa, UTS of 423 +/- 6.2 MPa, and EL of 7.6 +/- 0.9%). The alloy strengthening was mainly attributed to the refined grains and strong precipitation strengthening.
关键词 ：
age hardening age hardening magnesium alloy magnesium alloy mechanical properties mechanical properties microstructure microstructure secondary extrusion secondary extrusion
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| GB/T 7714 | Mansoor, Adil , Du, Wenbo , Yu, Zijian et al. Effect of Secondary Extrusion on the Microstructure and Mechanical Properties of Mg-12Gd-2Er-0.4Zr Alloy [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2021 . |
| MLA | Mansoor, Adil et al. "Effect of Secondary Extrusion on the Microstructure and Mechanical Properties of Mg-12Gd-2Er-0.4Zr Alloy" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2021) . |
| APA | Mansoor, Adil , Du, Wenbo , Yu, Zijian , Ding, Ning , Fu, Junjian , Jia, Linyue et al. Effect of Secondary Extrusion on the Microstructure and Mechanical Properties of Mg-12Gd-2Er-0.4Zr Alloy . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2021 . |
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摘要 ：
Mg-Zn-Zr (ZK60) alloys reinforced by ultra-low content (< 0.1 wt%) of graphene nanoplatelets (GNPs) were fabricated via stirring cast and extrusion processes. In composites, GNPs thoroughly dispersed and continuously combined with Mg matrix at the interface, beneficial for the load and heat transfer of composites. The static and dynamic mechanical properties of GNP/ZK60 composite were investigated and respectively compared with those of ZK60 alloy. With only 0.04 wt% addition, GNP nanofillers improved the impact toughness twice that of ZK60 matrix up to 17 J cm(-2). In tensile test, GNP(0.04)/ZK60 composite performed enhanced tensile yield strength of 256 MPa, improved by 62% than ZK60 alloy. Although grain boundary is commonly considered as defect to deteriorate transport property, GNP(0.04)/ZK60 composite with largely refined grain size conducted superior thermal conductivity of 139.4 W.(mK)(-1) than ZK60 alloy (132.2 W.(mK)(-1)) at room temperature. The dispersed GNPs in matrix provide beneficial networks for efficient load and heat transfer. This work explores that graphene reinforcement is an effective way to simultaneously improve the mechanical and thermal properties of Mg alloys for enlarged applications.
关键词 ：
Graphene Graphene Impact toughness Impact toughness Interface Interface Magnesium Magnesium Mechanical property Mechanical property Thermal conductivity Thermal conductivity
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| GB/T 7714 | Du, Xian , Du, Wenbo , Wang, Zhaohui et al. Simultaneously improved mechanical and thermal properties of Mg-Zn-Zr alloy reinforced by ultra-low content of graphene nanoplatelets [J]. | APPLIED SURFACE SCIENCE , 2021 , 536 . |
| MLA | Du, Xian et al. "Simultaneously improved mechanical and thermal properties of Mg-Zn-Zr alloy reinforced by ultra-low content of graphene nanoplatelets" . | APPLIED SURFACE SCIENCE 536 (2021) . |
| APA | Du, Xian , Du, Wenbo , Wang, Zhaohui , Liu, Ke , Li, Shubo . Simultaneously improved mechanical and thermal properties of Mg-Zn-Zr alloy reinforced by ultra-low content of graphene nanoplatelets . | APPLIED SURFACE SCIENCE , 2021 , 536 . |
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摘要 ：
Magnesium alloys, as a new type of biodegradable medical metal material, have a promising application in the field of vascular stents. However, the poor deformability of Mg alloys due to hexagonal close-packed (hcp) structure makes it difficult to fabricate their thin tube. In this study, the micro-tubes of Mg-4Zn-0.2Mn-0.2Ca alloy, a new type of degradable magnesium alloy, with 3.1 similar to 3.6 mm in outer diameter and 0.25 similar to 0.4 mm in wall thickness were prepared by hot extrusion-drawing composite process. The microstructure evolution and mechanical properties of the one with 3.6 mm in outer diameter, 0.4 mm in wall thickness show that the crystal slip, twins and recrystallization occur during the plastic deformation of the tubes, and the work hardening is significant. This drawn tube exhibits a tensile strength of 427.3 MPa, yield strength of 383.4 MPa, and elongation of 5.2%. After annealing at 300 degrees C for 30 min, the microstructure becomes uniform and the elongation increases to 18.0%, which is conducive to the fabrication of vascular stents.
关键词 ：
drawing drawing extrusion extrusion mechanical properties mechanical properties Mg-Zn-Mn-Ca alloy Mg-Zn-Mn-Ca alloy microstructure evolution microstructure evolution
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| GB/T 7714 | Fu Junjian , Du Wenbo , Du Xian et al. Fabrication and Properties of Magnesium Alloy Microtubes for Vascular Stent [J]. | RARE METAL MATERIALS AND ENGINEERING , 2020 , 49 (10) : 3576-3581 . |
| MLA | Fu Junjian et al. "Fabrication and Properties of Magnesium Alloy Microtubes for Vascular Stent" . | RARE METAL MATERIALS AND ENGINEERING 49 . 10 (2020) : 3576-3581 . |
| APA | Fu Junjian , Du Wenbo , Du Xian , Liu Ke , Li Shubo , Fu Jinlong et al. Fabrication and Properties of Magnesium Alloy Microtubes for Vascular Stent . | RARE METAL MATERIALS AND ENGINEERING , 2020 , 49 (10) , 3576-3581 . |
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摘要 ：
提出一种基于集成光波导沟槽耦合器的超紧凑折射率(RI)传感器。该结构包括入射波导、反射波导及透射波导,亚微米宽的沟槽位于三条波导的交汇处。入射波导中的导波光在沟槽侧壁发生受抑全内反射,使得一部分光经消逝场耦合进入透射波导,另一部分光被反射进入反射波导。因为消逝场耦合效率依赖于沟槽填充物的折射率,因此透射光强度和反射光强度都会随着沟槽填充物折射率的变化而改变,这意味着这种集成光波导沟槽耦合结构可作为微纳传感器用于实时探测液体折射率或溶液浓度。以氮化铝脊型波导为例,采用时域有限差分(FDTD)法对这种新型折射率传感器性能进行理论分析,经过结构优化,其折射率灵敏度可达207.05%/RIU。
关键词 ：
受抑全内反射 受抑全内反射 折射率传感 折射率传感 沟槽耦合器 沟槽耦合器 集成光学 集成光学
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| GB/T 7714 | 张成龙 , 蔡宸 , 刘克 et al. 基于集成光波导沟槽耦合器的超紧凑折射率传感器 [J]. | 光学学报 , 2020 , 40 (24) : 98-104 . |
| MLA | 张成龙 et al. "基于集成光波导沟槽耦合器的超紧凑折射率传感器" . | 光学学报 40 . 24 (2020) : 98-104 . |
| APA | 张成龙 , 蔡宸 , 刘克 , 关宝璐 , 祁志美 . 基于集成光波导沟槽耦合器的超紧凑折射率传感器 . | 光学学报 , 2020 , 40 (24) , 98-104 . |
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