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
刊名	JOURNAL OF APPLIED PHYSICS
	2014-08-07
通讯作者邮箱	lliu2000@mail.hust.edu.cn
卷号	116 期号:5 页码:53522
关键词	HIGH-TEMPERATURE DEFORMATION FREE-VOLUME CHANGES GLASS-TRANSITION HOMOGENEOUS DEFORMATION STRUCTURAL RELAXATION SHEAR BANDS DYNAMICS BEHAVIOR STATE DISSIPATION
ISSN号	0021-8979
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.
产权排序	[Zhang, Meng; Liu, Lin] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mold Technol, Wuhan 430074, Peoples R China; [Zhang, Meng; Dai, Lan Hong] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
合作状况	国内
中文摘要	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.
学科主题	Physics
分类号	二类/Q2
收录类别	SCI ; EI
资助信息	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.
原文出处	http://dx.doi.org/10.1063/1.4892457
语种	英语
WOS记录号	WOS:000341178900030
公开日期	2014-11-03
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/49137]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Zhang M,Dai LH,Liu L. 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.(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.