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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.
Source PublicationJOURNAL OF APPLIED PHYSICS
2014-08-07
Volume116Issue:5Pages:53522
ISSN0021-8979
AbstractFlow 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.
KeywordHigh-temperature Deformation Free-volume Changes Glass-transition Homogeneous Deformation Structural Relaxation Shear Bands Dynamics Behavior State Dissipation
Subject AreaPhysics
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000341178900030
Funding OrganizationThis 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.
DepartmentLNM冲击动力学与新型材料力学性能
Classification二类/Q2
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/49137
Collection非线性力学国家重点实验室
Corresponding AuthorLiu, L (reprint author), Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mold Technol, Wuhan 430074, Peoples R China.
Recommended Citation
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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