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Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature
Z. T. Wang; J. Pan; Y. Li; C. A. Schuh
2013
Source PublicationPhysical Review Letters
ISSN0031-9007
Volume111Issue:13
AbstractThe 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.
description.department[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
KeywordFree-volume Amorphous Pd40ni40p20 Structural Relaxation Inhomogeneous Flow Deformation Fracture Alloys Localization Transition Reduction
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Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/71570
Collection中国科学院金属研究所
Recommended Citation
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).
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