Enhanced plasticity in Zr-Cu-Ag-Al-Be bulk metallic glasses

	Enhanced plasticity in Zr-Cu-Ag-Al-Be bulk metallic glasses
	Cao, QP; Jin, JB; Ma, Y; Cao, XZ; Wang, BY; Qu, SX; Wang, XD; Zhang, DX; Jiang, JZ; Cao XZ(曹兴忠)
刊名	JOURNAL OF NON-CRYSTALLINE SOLIDS
	2015
卷号	412 页码:35-44
关键词	Bulk metallic glass Bending plasticity Poisson's ratio Free volume Shear transformation zone
英文摘要	The dependences of bending plasticity on compositional adjustment and structural relaxation in Zr-Cu-Ag-Al-Be bulk metallic glasses (BMGs) were systematically studied. We revealed that with increasing Zr content, the plasticity was enhanced at the expense of glass forming ability and the shear transformation zone (STZ) volume became larger, while structural relaxation resulted in the embrittlement accompanied with the further enlarged STZ volume. Average positron lifetime, representing average free volume content, dropped with the increased Zr content and structural relaxation. These results indicate that neither STZ volume nor average positron lifetime can solely describe plastic deformability of BMGs. Analyzing positron annihilation lifetime spectra, a bimodal distribution of free volume size was observed. The smaller free volume shrinks with increased concentration and the larger free volume expands with decreased concentration due to the increase in the Zr content, while structural relaxation mainly reduces smaller free volume. The effects of free volume size distribution on the STZ activation and shear band propagation have been discussed. It has been demonstrated that combining the STZ volume with free volume size distribution can explain the plasticity evolution with composition and structural relaxation, which may shed light on understanding the deformation mechanism of BMGs. (C) 2015 Elsevier B.V. All rights reserved.
学科主题	Materials Science
类目[WOS]	Materials Science, Ceramics ; Materials Science, Multidisciplinary
收录类别	SCI ; EI
WOS记录号	WOS:000350937300007
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228228]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Cao, QP,Jin, JB,Ma, Y,et al. Enhanced plasticity in Zr-Cu-Ag-Al-Be bulk metallic glasses[J]. JOURNAL OF NON-CRYSTALLINE SOLIDS,2015,412:35-44.
APA	Cao, QP.,Jin, JB.,Ma, Y.,Cao, XZ.,Wang, BY.,...&王宝义.(2015).Enhanced plasticity in Zr-Cu-Ag-Al-Be bulk metallic glasses.JOURNAL OF NON-CRYSTALLINE SOLIDS,412,35-44.
MLA	Cao, QP,et al."Enhanced plasticity in Zr-Cu-Ag-Al-Be bulk metallic glasses".JOURNAL OF NON-CRYSTALLINE SOLIDS 412(2015):35-44.