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作者:

Li, Jingwei (Li, Jingwei.) | Sui, Manling (Sui, Manling.) (学者:隋曼龄) | Li, Bin (Li, Bin.)

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EI Scopus SCIE

摘要:

Among the twinning modes in hexagonal close-packed (HCP) metals, the mechanism for {11 (2) over bar2}< 11 (2) over bar(3) over bar > mode is particularly confusing and controversial. In the literature reports, there are three possible second invariant planes, i.e. the K-2 planes for {11 (2) over bar2}< 11 (2) over bar(3) over bar > twinning mode: {11(2)over bar>(4) over bar} which has been widely accepted and corresponds to a three-layer zonal twinning dislocation; {11 (2) over bar(2) over bar} that is deemed unfavorable; and (0002) which has only been observed in atomistic simulations and corresponds to a single-layer twinning dislocation. {11 (2) over bar(4) over bar} was predicted by classical twinning theory and the experimentally measured magnitude of twinning shear s in titanium and zirconium seemed to agree well with the prediction. However, {11 (2) over bar(4) over bar} has never been verified in simulations which show that (0002) should be the K-2 plane. This conflict has not been resolved due to the lack of experimental observation of the structure of twinning dislocations. In this work, scanning transmission electron microscopy (STEM) observations are conducted to resolve the twin boundary structure in deformed pure titanium on the atomic scale, combined with atomistic simulations. Atomic resolution STEM unambiguously shows that the twinning dislocation only involves a single twinning plane and the K-2 plane is (0002), which is consistent with the atomistic simulations. The STEM results also reveal a half-shear-half-shuffle process which is manifested by a unique twin boundary structure generated by the glide of single-layer twinning dislocations. To explain these results, the lattice correspondences of all three K-2 planes are examined in great detail. In particular, shear and shuffle required in the lattice transformations are analyzed inside the framework of classical theory. These analyses explain well why (0002) is the more favorable K-2 plane than {11(2)over bar>(4) over bar} and {11 (2) over bar(2) over bar}, and properly resolve the conflict between the prediction of the classical twinning theory and the simulation results. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

关键词:

Lattice correspondence Twin boundary Twinning dislocation

作者机构:

  • [ 1 ] [Li, Jingwei]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Properties Solids, Beijing 100124, Peoples R China
  • [ 2 ] [Sui, Manling]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Properties Solids, Beijing 100124, Peoples R China
  • [ 3 ] [Li, Bin]Univ Nevada, Dept Chem & Mat Engn, Reno, NV 89557 USA

通讯作者信息:

  • 隋曼龄

    [Sui, Manling]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Properties Solids, Beijing 100124, Peoples R China;;[Li, Bin]Univ Nevada, Dept Chem & Mat Engn, Reno, NV 89557 USA

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来源 :

ACTA MATERIALIA

ISSN: 1359-6454

年份: 2021

卷: 216

9 . 4 0 0

JCR@2022

ESI学科: MATERIALS SCIENCE;

ESI高被引阀值:116

JCR分区:1

被引次数:

WoS核心集被引频次: 18

SCOPUS被引频次: 18

ESI高被引论文在榜: 0 展开所有

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中文被引频次:

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