PLASTIC DEFORMATION MECHANISMS IN NANOTWINNED METALS

doi:10.3724/SP.J.1037.2013.00697

Acta Metall Sin

2014, Vol. 50

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

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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

Cite this article:

LU Lei, YOU Zesheng. PLASTIC DEFORMATION MECHANISMS IN NANOTWINNED METALS. Acta Metall Sin, 2014, 50(2): 129-136.

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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

Received: 05 November 2013

ZTFLH:

TG146

Fund: Supported by National Basic Research Program of China (No.2012CB932202) and National Natural Science Foundation of China (Nos.51071153 and 51371171)

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

Fig.1

Thompson双四面体与纳米孪晶片层的相对位向关系

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	$(111) [1 - 01]$

fcc纳米孪晶金属的滑移系类别

Fig.2

$[1 1 - 0]$ 织构纳米孪晶Cu的Schmid因子分析

Fig.3

[111]织构纳米孪晶Cu的Schmid因子分析

Fig.4

[111]织构纳米孪晶Cu相对于孪晶界不同方向压缩的Schmid因子分析

Fig.5

柱状纳米孪晶Cu相对于孪晶界不同方向压缩变形的微观结构观察^[45]

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