Impact of cryogenic cycling on tracer diffusion in plastically deformed Pd40 Ni40 P 20 bulk metallic glass

被引：22
作者：
Hassanpour, Afrouz [1 ]
Vaidya, Mayur [2 ]
Divinski, Sergiy, V [1 ,3 ]
Wilde, Gerhard [1 ]
机构：
[1] Westfalische Wilhelms Univ Munster, Inst Mat Phys, Wilhelm Klemm Str 10, D-48149 Munster, Germany
[2] Indian Inst Technol Hyderabad, Kandi 502285, Sangareddy, India
[3] Samara Natl Res Univ, Moskovskoye Shosse 34, Samara 443086, Russia
来源：
ACTA MATERIALIA | 2021年 / 209卷 / 209期
关键词：
Bulk metallic glass; Plastic deformation; Cryogenic thermal cycling; Shear bands; Diffusion; SHEAR BANDS; PD40NI40P20; RELAXATION; LIQUID; DEFORMATION; NI; REJUVENATION; TEMPERATURE; STABILITY; KINETICS;
D O I：
10.1016/j.actamat.2021.116785
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The impact of thermo-mechanical treatment, in particular of room temperature high-pressure torsion (HPT), cold rolling and cryogenic thermo-cycling on shear band diffusion in a model Pd40Ni40P20 bulk metallic glass is investigated. Tracer diffusion measurements reveal the existence of fast short-circuit dif-fusion in deformed glasses and the diffusion enhancement was found to depend on the processing mode. The HPT processing imposes an extremely large shear deformation under quasi-hydrostatic conditions whereas cold rolling induces individual well-separated shear bands, though shear band diffusion is found to be faster after cold rolling. The cryogenic thermo-cycling enhances the shear band diffusion further and a conceptual explanation for the processes leading to kinetic rejuvenation is proposed. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：10
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