纳米孪晶金属塑性变形机制<sup>*</sup>

doi:10.3724/SP.J.1037.2013.00697

金属学报

2014, Vol. 50

Issue (2): 129-136 DOI: 10.3724/SP.J.1037.2013.00697

本期目录 | 过刊浏览

纳米孪晶金属塑性变形机制^*

卢磊(

), 尤泽升

中国科学院金属研究所沈阳材料科学国家(联合)实验室, 沈阳110016

PLASTIC DEFORMATION MECHANISMS IN NANOTWINNED METALS

LU Lei(

), YOU Zesheng

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

引用本文:

卢磊, 尤泽升. 纳米孪晶金属塑性变形机制^*[J]. 金属学报, 2014, 50(2): 129-136.
Lei LU, Zesheng YOU. PLASTIC DEFORMATION MECHANISMS IN NANOTWINNED METALS[J]. Acta Metall Sin, 2014, 50(2): 129-136.

全文: PDF(2381 KB) HTML

摘要:

本文综述了纳米孪晶金属材料的塑性变形机制. 通过分析纳米孪晶二维结构变形时可启动的滑移位错类型, 揭示纳米孪晶金属塑性变形的3种位错机制, 即位错塞积并穿过孪晶界机制, Shockley不全位错诱导孪晶界迁移机制以及贯穿位错在孪晶片层内受限滑移机制. 通过改变加载方向与孪晶界面的相对取向可实现这3类位错机制的可控转变.

关键词 ：纳米孪晶金属, 变形机制, 位错滑移, 各向异性, 力学性能

Abstract：

A brief overview is provided about the plastic deformation mechanisms in nanotwinned metals. The unique two-dementional nanoscale twin lamellae lead to different dislocation slip systems activated during plastic deformation. It has been revealed that there are three distinctly different dislocation-mediated deformation mechanisms in nanotwinned metals, namely dislocation pile-up against and slip transfer across twin boundaries, Shockley partials gliding on twin boundaries leading to twin boundary migration, and threading dislocations slip confined by neighboring twin boundaries. It is further demonstrated that these three dislocation-mediated mechanisms are switchable upon changing in the loading direction with respect to twin boundaries.

Key words： nano-twinned metal deformation mechanism dislocation slip anisotropy mechanical property

收稿日期: 2013-11-05

ZTFLH:

TG146

基金资助:* 国家重点基础研究发展计划项目2012CB932202以及国家自然科学基金项目51071153和51371171资助

作者简介: null

卢磊, 女, 1970年生, 研究员, 博士

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链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00697 或 https://www.ams.org.cn/CN/Y2014/V50/I2/129

图 1

No.	Category	Slip plane	Slip direction	Miller index
1	Hard mode I	DBC	DB	$(1 1 - 1) [011]$
2		DBC	DC	$(1 1 - 1) [110]$
3		DAC	DA	$(1 - 11) [101]$
4		DAC	DC	$(1 - 11) [110]$
5		DAB	DA	$(11 1 -) [101]$
6		DAB	DB	$(11 1 -) [011]$
7	Hard mode II	DBC	BC	$(1 1 - 1) [1 - 01]$
8		DAC	AC	$(1 - 11) [01 1 -]$
9		DAB	AB	$(11 1 -) [1 - 10]$
10	Soft mode	ABC	AB	$(111) [1 - 10]$
11		ABC	AC	$(111) [01 1 -]$
12		ABC	BC	$(111) [1 - 01]$

表1

图 2

图 3

图4

图 5

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