Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature

IMR OpenIR

	Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature
	Z. T. Wang; J. Pan; Y. Li; C. A. Schuh
	2013
发表期刊	Physical Review Letters
ISSN	0031-9007
卷号	111 期号:13
摘要	The deformation of metallic glasses involves two competing processes: a disordering process involving dilatation, free volume accumulation, and softening, and a relaxation process involving diffusional ordering and densification. For metallic glasses at room temperature and under uniaxial loading, disordering usually dominates, and the glass can fail catastrophically as the softening process runs away in a localized mode. Here we demonstrate conditions where the opposite, unexpected, situation occurs: the densifying process dominates, resulting in stable plastic deformation and work hardening at room temperature. We report densification and hardening during deformation in a Zr-based glass under multiaxial loading, in a notched tensile geometry. The effect is driven by stress-enhanced diffusional relaxation, and is attended by a reduction in exothermic heat and hardening signatures similar to those observed in the classical thermal relaxation of glasses. The result is significant, stable, plastic, extensional flow in metallic glasses, which suggest a possibility of designing tough glasses based on their flow properties.
部门归属	[wang, z. t. ; pan, j. ; li, y.] natl univ singapore, dept mat sci & engn, singapore 117576, singapore. [li, y.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [schuh, c. a.] mit, dept mat sci & engn, cambridge, ma 02139 usa. ; li, y (reprint author), natl univ singapore, dept mat sci & engn, singapore 117576, singapore. ; mseliy@nus.edu.sg ; schuh@mit.edu
关键词	Free-volume Amorphous Pd40ni40p20 Structural Relaxation Inhomogeneous Flow Deformation Fracture Alloys Localization Transition Reduction
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71570
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. T. Wang,J. Pan,Y. Li,et al. Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature[J]. Physical Review Letters,2013,111(13).
APA	Z. T. Wang,J. Pan,Y. Li,&C. A. Schuh.(2013).Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature.Physical Review Letters,111(13).
MLA	Z. T. Wang,et al."Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature".Physical Review Letters 111.13(2013).