Mechanical annealing in the flow of supercooled metallic liquid

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	Mechanical annealing in the flow of supercooled metallic liquid
	Zhang M; Dai LH(戴兰宏); Liu L; Liu, L (reprint author), Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mold Technol, Wuhan 430074, Peoples R China.
发表期刊	JOURNAL OF APPLIED PHYSICS
	2014-08-07
卷号	116 期号:5 页码:53522
ISSN	0021-8979
摘要	Flow induced structural evolution in a supercooled metallic liquid Vit106a (Zr58.5Cu15.6Al10.3 Ni12.8Nb2.8, at. %) was investigated via uni-axial compression combined with differential scanning calorimeter (DSC). Compression tests at strain rates covering the transition from Newtonian flow to non-Newtonian flow and at the same strain rate 2 x 10(-1) s(-1) to different strains were performed at the end of glass transition (Tg-end = 703 K). The relaxation enthalpies measured by DSC indicate that the samples underwent non-Newtonian flow contain more free volume than the thermally annealed sample (703 K, 4 min), while the samples underwent Newtonian flow contain less, namely, the free volume of supercooled metallic liquids increases in non-Newtonian flow, while decreases in Newtonian flow. The oscillated variation of the relaxation enthalpies of the samples deformed at the same strain rate 2 x 10(-1) s(-1) to different strains confirms that the decrease of free volume was caused by flow stress, i.e., "mechanical annealing." Micro-hardness tests were also performed to show a similar structural evolution tendency. Based on the obtained results, the stress-temperature scaling in the glass transition of metallic glasses are supported experimentally, as stress plays a role similar to temperature in the creation and annihilation of free volume. In addition, a widening perspective angle on the glass transition of metallic glasses by exploring the 3-dimensional stress-temperature-enthalpy phase diagram is presented. The implications of the observed mechanical annealing effect on the amorphous structure and the work-hardening mechanism of metallic glasses are elucidated based on atomic level stress model. (C) 2014 AIP Publishing LLC.
关键词	High-temperature Deformation Free-volume Changes Glass-transition Homogeneous Deformation Structural Relaxation Shear Bands Dynamics Behavior State Dissipation
学科领域	Physics
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000341178900030
项目资助者	This work was financially supported by the National Nature Science Foundation of China under Grant Nos. 51271082 and 52171081, the National Basic Research Program of China under Grant No. 2012CB937500) and the CAS/SAFEA International Partnership Program for Creative Research Teams. M. Zhang and L. Liu are also grateful to the Analytical and Testing Center, Huazhong University of Science & Technology for technical assistances.
课题组名称	LNM冲击动力学与新型材料力学性能
论文分区	二类/Q2
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/49136
专题	非线性力学国家重点实验室
通讯作者	Liu, L (reprint author), Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mold Technol, Wuhan 430074, Peoples R China.
推荐引用方式 GB/T 7714	Zhang M,Dai LH,Liu L,et al. Mechanical annealing in the flow of supercooled metallic liquid[J]. JOURNAL OF APPLIED PHYSICS,2014,116,5,:53522.
APA	Zhang M,Dai LH,Liu L,&Liu, L .(2014).Mechanical annealing in the flow of supercooled metallic liquid.JOURNAL OF APPLIED PHYSICS,116(5),53522.
MLA	Zhang M,et al."Mechanical annealing in the flow of supercooled metallic liquid".JOURNAL OF APPLIED PHYSICS 116.5(2014):53522.

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