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学者姓名：高坤元
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Abstract ：
The crystal structure, orientation, reduced modulus, and hardness of Al 3 Sc single crystal were studied using X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and nanoindentation techniques, combined with Hertzian elastic theory method (Hertz) and Oliver-Pharr method (O & P). Millimeter-sized Al 3 Sc single crystals were prepared using quasi-equilibrium solidification of hypereutectic Al-15(wt %) Sc alloy. The XRD results showed that the samples were composed of L1 2 -Al 3 Sc and Al phases. The EBSD and nanoindentation results showed that for five Al 3 Sc single crystals with different orientations, the reduced moduli measured by Hertz method were 146.6 +/- 0.4-148.3 +/- 0.2 GPa; while measured by O & P method they were 147 +/- 2-150 +/- 3 GPa. The corresponding hardnesses were varied between 3.8 +/- 0.1 and 3.9 +/- 0.1 GPa. The Poisson's ratio and elastic constants were determined through iterative calculation based on the relationship between the reduced modulus and Young's modulus at various orientations. The polycrystal elastic properties, bulk modulus, shear modulus and Young's modulus, were determined. The elastic constants c11, c12, and c44 were 179.2 +/- 0.4, 44.1 +/- 0.1, and 68.3 +/- 0.3 GPa, respectively; the Poisson's ratio was 0.196 +/- 0.001. The Young's modulus of five Al 3 Sc single crystals oriented in different directions was in the narrow range 161-164 GPa. The anisotropy factor of Al 3 Sc crystal was 1.011 +/- 0.002, confirming that it is elastically isotropic. These results provide fundamental information for the research and development of the Al 3 Sc intermetallic compound and related alloys in future.
Keyword ：
Nanoindentation Nanoindentation Hertzian elasticity theory Hertzian elasticity theory Oliver-Pharr method Oliver-Pharr method Mechanical properties Mechanical properties Al-3 Sc Single crystal Al-3 Sc Single crystal
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| GB/T 7714 | Ning, Jing , Gao, Kunyuan , Wang, Jianzhu et al. The mechanical properties of Al 3 Sc single crystal investigated by nanoindentation using Hertzian elasticity theory method and Oliver-Pharr method [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2024 , 994 . |
| MLA | Ning, Jing et al. "The mechanical properties of Al 3 Sc single crystal investigated by nanoindentation using Hertzian elasticity theory method and Oliver-Pharr method" . | JOURNAL OF ALLOYS AND COMPOUNDS 994 (2024) . |
| APA | Ning, Jing , Gao, Kunyuan , Wang, Jianzhu , Xiong, Xiangyuan , Li, Haonan , Min, Fanlei et al. The mechanical properties of Al 3 Sc single crystal investigated by nanoindentation using Hertzian elasticity theory method and Oliver-Pharr method . | JOURNAL OF ALLOYS AND COMPOUNDS , 2024 , 994 . |
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Abstract ：
The ballistic impact of two 7XXX aluminum alloys, 7A52-T6 and 7A62-T6, as well as their combination in a 7B52 laminate plate, was simulated and experimentally tested. Three types of projectiles were utilized hard ogival nosed, hard blunt nosed, and 304 steel core projectiles to investigate the ballistic resistance and failure mechanisms of the aluminum alloy targets. Additionally, an existing modified Gurson-Tvergaard-Needleman (GTN) model incorporating shear, void growth, and spalling failure mechanisms, was employed to simulate the ballistic impact process, utilized to analyze energy dissipation during impact. The results reveal that the 7A52 alloy only experiences ductile hole expansion failure, whereas the 7A62 high-strength aluminum alloy undergoes spalling and fragmentation subsequent to penetration, leading to potential impact hazards. Due to its backing layer being the highly ductile 7A52 alloy, the laminate plate will not produce fragments after penetration. The improved GTN model provided better predictions of the impact failure modes of the aluminum alloys. Concerning impact performance, when subjected to hard ogival projectiles, the laminate alloy did not enhance material impact resistance. However, when impacted by blunt-nosed projectiles, the laminate alloy exhibited a 27 % improvement over the 7A52 plate and an 11.9 % increase over the 7A62 plate. Furthermore, when impacted by 304 steel core ogival projectiles, the laminate alloy demonstrated over a 41.3 % improvement compared to the 7A52 plate and over a 15.5 % increase compared to the 7A62 plate. The laminate plate's high ballistic performance was attributed to the increased plastic deformation energy after spalling failure, while ensuring high energy absorption during ductile hole expansion penetration.
Keyword ：
Failure mechanisms Failure mechanisms Impact simulation Impact simulation Ballistic resistance Ballistic resistance Energy dissipation Energy dissipation Aluminum alloy laminate plate Aluminum alloy laminate plate
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| GB/T 7714 | Min, Fanlei , Gao, Kunyuan , Wei, Wu et al. Ballistic resistance of 7XXX laminate aluminum alloy plates and base alloys subjected to different projectiles [J]. | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 191 . |
| MLA | Min, Fanlei et al. "Ballistic resistance of 7XXX laminate aluminum alloy plates and base alloys subjected to different projectiles" . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 191 (2024) . |
| APA | Min, Fanlei , Gao, Kunyuan , Wei, Wu , Wu, Xiaolan , Wen, Shengping , Huang, Hui et al. Ballistic resistance of 7XXX laminate aluminum alloy plates and base alloys subjected to different projectiles . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 191 . |
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Abstract ：
The effects of Si addition to Fe on the formation and growth of intermetallic compounds (IMC) in Fe/Al composites were studied by Scanning electron microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and electron backscatter diffraction (EBSD) techniques. The results showed that: when annealing time was 1 h, the critical IMC formation temperature of Pure Al/Pure Fe, Pure Al/Fe+0.82Si, Al+0.88Si/Pure Fe and Al+0.88Si/Fe+0.82Si were 440 degrees C, 480 degrees C, 520 degrees C and 620 degrees C, respectively. The major IMC phase formed in the four composites after heat treatments at 640 degrees C/1h and 640 degrees C/24h was the eta phase (Fe2Al5), and a large number of theta phase (Fe4Al13) particles were present in the eta phase for the Pure Al/Pure Fe sample. When Si element was added to Fe and Al, Fe3Al2Si3 phase and FeAl2Si phase were observed in the eta phase. The thickness of the formed IMC layer in the four composites after heat treatment at 640 degrees C/1h was in the order: Pure Al/Pure Fe approximate to Pure Al/Fe+0.88Si > Al+0.888Si/Pure Fe approximate to Al+0.888Si/Fe+0.88Si. The growth activation energies of the IMC layer in the Pure Al/Pure Fe, Pure Al/Fe+0.82Si, Al+0.88Si/Pure Fe, Al+0.88Si/Fe+0.82Si samples were 76.1 kJ/mol, 276 kJ/mol, 349 kJ/mol and 519.6 kJ/mol, respectively. The effect of Si atoms on the formation of IMC was mainly by the interfacial enrichment mechanism and the new phase inhibition mechanism of FexAlySiz. The enrichment of Si at the interface of Al and Fe increased the growth activation energy and reduce the growth rate of IMC layer thickness. The formation of new FexAlySiz phase can inhibit the rapid growth of IMC phase along the C axis.
Keyword ：
Si Si Al/Fe composites Al/Fe composites Growth rate Growth rate Intermetallic compounds Intermetallic compounds
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| GB/T 7714 | Zhang, Xiaojun , Gao, Kunyuan , Xiong, Xiangyuan et al. Effect of Si addition to Fe on the formation and growth of intermetallic compounds in Fe/Al composites [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 28 : 1294-1302 . |
| MLA | Zhang, Xiaojun et al. "Effect of Si addition to Fe on the formation and growth of intermetallic compounds in Fe/Al composites" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 28 (2024) : 1294-1302 . |
| APA | Zhang, Xiaojun , Gao, Kunyuan , Xiong, Xiangyuan , Hu, Xiuhua , Wang, Zhen , Wang, Jianzhu et al. Effect of Si addition to Fe on the formation and growth of intermetallic compounds in Fe/Al composites . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 28 , 1294-1302 . |
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Abstract ：
一种激光粉末床熔合技术制备高强度Al‑Si‑Mg合金的方法，属于增材制造材料领域。包含S1：Al‑Si‑Mg合金粉末成分设计；S2：筛分Al‑Si‑Mg合金粉末；S3：Al‑Si‑Mg合金粉末干燥处理；S4 : 成型参数设计；本发明通过Er、Zr微合金化并且调控Si、Mg含量，优化LPBF成型参数，细化胞晶尺寸。提高了LPBF制备Al‑Si‑Mg合金的应变硬化能力，屈服强度可以达到370MPa以上。
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| GB/T 7714 | 魏午 , 毕舰镭 , 黄晖 et al. 一种激光粉末床熔合技术制备高强度Al-Si-Mg合金的方法 : CN202310409560.1[P]. | 2023-04-17 . |
| MLA | 魏午 et al. "一种激光粉末床熔合技术制备高强度Al-Si-Mg合金的方法" : CN202310409560.1. | 2023-04-17 . |
| APA | 魏午 , 毕舰镭 , 黄晖 , 亓鹏 , 荣莉 , 吴晓蓝 et al. 一种激光粉末床熔合技术制备高强度Al-Si-Mg合金的方法 : CN202310409560.1. | 2023-04-17 . |
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Abstract ：
一种提高铝合金叠层复合板抗冲击性能的时效工艺，属于有色金属技术领域，对两种Zn、Mg含量差别较大的叠层复合板轧制，得到叠层复合板的总厚度为5.0mm, 其中Al‑7.0Zn‑3.0Mg合金的厚度为4.07mm，Al‑4.4Zn‑2.3Mg合金厚度为0.93mm，然后对复合板进行470℃/1h的统一固溶处理，进一步进行统一时效处理，时效工艺为105～110℃保温36～60h，本发明所得叠层复合板具有高的抗冲击强度和良好的冲击韧性。
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| GB/T 7714 | 高坤元 , 窦义武 , 闵范磊 et al. 一种提高铝合金叠层复合板抗冲击性能的时效工艺 : CN202310272434.6[P]. | 2023-03-17 . |
| MLA | 高坤元 et al. "一种提高铝合金叠层复合板抗冲击性能的时效工艺" : CN202310272434.6. | 2023-03-17 . |
| APA | 高坤元 , 窦义武 , 闵范磊 , 聂祚仁 , 黄晖 , 文胜平 et al. 一种提高铝合金叠层复合板抗冲击性能的时效工艺 : CN202310272434.6. | 2023-03-17 . |
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Abstract ：
复合添加Er、Zr的超高强Al‑Zn‑Mg‑Cu合金及制备工艺，成分是Zn7.4～8.1wt.％、Mg 2.2～2.6wt.％、Cu 0.8～1.2wt.％％、Mn 0.2～0.5wt.％、Er0.02～0.20wt.％、Zr 0.05～015wt.％，余量为Al及不可避免的杂质。采用纯铝、纯锌、纯镁、Cu板、Al‑Mn、Al‑Zr、Al‑Er配料；Mg、Cu、Zn以纯金属形式加入，Zr、Er以中间合金形式加入，完成铸锭熔炼。为消除铸态组织偏析，提高合金组织均匀性，同时促进合金中Al3(Er, Zr)粒子弥散析出，进行三级均匀化处理：350℃/8h+420℃/4h+480℃/8h；450℃挤压为厚壁管材；为析出相弥散析出，进行470℃/2h固溶处理，水冷，提高合金过饱和程度；120℃/16h+180℃/Xmin+120℃/20h、120℃/16h+190℃/Xmin+120℃/20h三级回归再时效。三级回归再时效处理保证合金强度且改善合金抗腐蚀性能。
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| GB/T 7714 | 吴晓蓝 , 杨太辉 , 文胜平 et al. 复合添加Er、Zr的超高强Al-Zn-Mg-Cu合金及制备工艺 : CN202310228661.9[P]. | 2023-03-03 . |
| MLA | 吴晓蓝 et al. "复合添加Er、Zr的超高强Al-Zn-Mg-Cu合金及制备工艺" : CN202310228661.9. | 2023-03-03 . |
| APA | 吴晓蓝 , 杨太辉 , 文胜平 , 高坤元 , 魏午 , 黄晖 et al. 复合添加Er、Zr的超高强Al-Zn-Mg-Cu合金及制备工艺 : CN202310228661.9. | 2023-03-03 . |
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Abstract ：
一种Zn、Er、Zr复合微合金化AlMgMn合金的双级均匀化退火工艺，属于有色金属技术领域。其有以下合金成分5.82％Mg、0.18％Er、0.12％Zr、0.69％Mn、0.58％Zn，其余含量为纯铝。经325℃/(2‑10h)低温析出退火后，再进行420‑430℃/24h的高温均匀化退火。其中，最优的双级均匀化工艺为325℃/8h+430℃/24h。该工艺在达到均匀化目的的同时，使得第二相粒子在低温均匀弥散析出，提高了合金的力学性能，并为后续的热处理工艺奠定了基础。
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| GB/T 7714 | 高坤元 , 李琳 , 王剪烛 et al. 一种Zn、Er、Zr复合微合金化AlMgMn合金的双级均匀化退火工艺 : CN202310263794.X[P]. | 2023-03-17 . |
| MLA | 高坤元 et al. "一种Zn、Er、Zr复合微合金化AlMgMn合金的双级均匀化退火工艺" : CN202310263794.X. | 2023-03-17 . |
| APA | 高坤元 , 李琳 , 王剪烛 , 路易 , 聂祚仁 , 黄晖 et al. 一种Zn、Er、Zr复合微合金化AlMgMn合金的双级均匀化退火工艺 : CN202310263794.X. | 2023-03-17 . |
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Abstract ：
The Gurson-Tvergaard-Needleman (GTN) model has provided a powerful description of the nucleation growth and coalescence of micro voids, but it has limitations in simulating shear fracture due to the absence of a description of shear localization behavior. A shear improvement method is proposed for simulating the ductile fracture of materials under different stress states. The modified model not only allows for strain hardening of the matrix material, but also accounts for the stress degradation caused by shear. The strength equation of the material is described by both the shear stress state function and a decay function, making it easier for materials under shear stress state to experience material softening and further inducing shear fracture. The modified GTN model is developed by incorporating the shear stress degradation factor into the yield function, while taking into account both void growth and shear failure mechanisms. By carefully calibrating the model's parameters, the deformation and fracture processes of tensile, plane strain, notch tensile, and compression specimens in the 7A52 aluminum alloy are simulated. The damage evolution behavior of the material under different stress states is analyzed. The results indicate that the damage include void growth mechanism and void shear mechanism. The proportions of these two mechanisms vary under different levels of stress triaxiality. Upon localizing material deformation, the shear stress state intensifies, and the shear damage mechanism assumes a critical role in fracture. The modified GTN model accurately predicts the load-displacement response and fracture path of the 7A52 aluminum alloy under a wide range of stress states.
Keyword ：
stress states stress states stress degradation stress degradation aluminum alloy aluminum alloy shear modified GTN model shear modified GTN model ductile fracture ductile fracture
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| GB/T 7714 | Min, Fanlei , Gao, Kunyuan , Zhang, Xiaojun et al. A shear modified GTN model based on stress degradation method for predicting ductile fracture [J]. | MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING , 2023 , 31 (8) . |
| MLA | Min, Fanlei et al. "A shear modified GTN model based on stress degradation method for predicting ductile fracture" . | MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING 31 . 8 (2023) . |
| APA | Min, Fanlei , Gao, Kunyuan , Zhang, Xiaojun , Wei, Wu , Qi, Peng , Wu, Xiaolan et al. A shear modified GTN model based on stress degradation method for predicting ductile fracture . | MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING , 2023 , 31 (8) . |
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Abstract ：
The depth profiling of the element content and precipitation phase distribution of the AA4045/AA3003mod (Al-1.5Mn-0.35Cu alloy)/AA4045 brazed sheets were investigated by optical microscope observation, electron probe microanalysis (EPMA), focused ion beamscanning transmission electron microscopy (FIB-STEM). The electrochemical test and sea water acetic acid test (SWAAT) were performed to obtain the evolution of electrochemical responses and corrosion forms of brazed sheet. EPMA results showed that a diffusion layer with the thickness of approximately 50 mm existed between the clad layer and core layer, where the Cu diffused from the core layer and Si diffused from the clad layer. It was found that brazing led to a significant low elements solid solution area at the end of the Si diffusion path, where the open circuit potential was lower by 25 mV comparing to the unaffected region. Thus the diffusion zone can provide effective cathodic protection to the unaffected region as sacrificial anode by the potential gradient. The SWAAT analysis revealed the corrosion mechanism of the residual cladding was pitting and intergranular corrosion. This area with high density of intermetallic compounds and Si particles increased sensitivity to localized attacks. These results demonstrated the successful application of the FIB-STEM system in illustrating the electrochemical responses and corrosion propagation by an accurate in-depth characterization of intermetallic particles and the matrix solid solution. (c) 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keyword ：
Band of dense precipitates Band of dense precipitates Solid solution Solid solution Diffusion Diffusion Corrosion Corrosion Brazed sheet Brazed sheet
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| GB/T 7714 | Hu, Xiuhua , Gao, Kunyuan , Xiong, Xiangyuan et al. The influence of microstructure on corrosion mechanism for brazed sheet of AA4045/ AA3003mod/AA4045 laminated composites at different depths [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2023 , 27 : 1190-1199 . |
| MLA | Hu, Xiuhua et al. "The influence of microstructure on corrosion mechanism for brazed sheet of AA4045/ AA3003mod/AA4045 laminated composites at different depths" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 27 (2023) : 1190-1199 . |
| APA | Hu, Xiuhua , Gao, Kunyuan , Xiong, Xiangyuan , Ding, Yusheng , Zhang, Xiaojun , Wei, Wu et al. The influence of microstructure on corrosion mechanism for brazed sheet of AA4045/ AA3003mod/AA4045 laminated composites at different depths . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2023 , 27 , 1190-1199 . |
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Abstract ：
一种降低喷射成形铝合金的热塑性变形抗力的方法，属于铝合金加工技术领域。在变形前对致密化喷射成形的铝合金试样进行高温短时保温；然后进行热塑性变形；高温保温温度为420℃，保温时间为0～4h，且不为0；保温后水淬。可以有效控制合金的微观组织，提高热加工性能。该方法利用铝合金再热变形过程中的合金变形抗力及动态再结晶行为制定热加工制度，适用性广，易于实现工业化规模生产，适用于各系铝合金材料。操作简单，考虑全面，实用性强。
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| GB/T 7714 | 高坤元 , 宋硕 , 荣莉 et al. 一种降低喷射成形铝合金的热塑性变形抗力的方法 : CN202210046255.6[P]. | 2022-01-14 . |
| MLA | 高坤元 et al. "一种降低喷射成形铝合金的热塑性变形抗力的方法" : CN202210046255.6. | 2022-01-14 . |
| APA | 高坤元 , 宋硕 , 荣莉 , 魏午 , 黄晖 , 文胜平 et al. 一种降低喷射成形铝合金的热塑性变形抗力的方法 : CN202210046255.6. | 2022-01-14 . |
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