Criteria for tensile plasticity in Cu-Zr-Al bulk metallic glasses

被引：76

作者：

Pauly, S. ^{[1
]}

Liu, G. ^{[2
]}

Gorantla, S. ^{[1
]}

Wang, G. ^{[1
]}

Kuehn, U. ^{[1
]}

Kim, D. H. ^{[3
]}

Eckert, J. ^{[1
,4
]}

机构：

[1] IFW Dresden, Inst Komplexe Mat, D-01069 Dresden, Germany

[2] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[3] Yonsei Univ, Dept Met Engn, Ctr Noncrystalline Mat, Seoul 120749, South Korea

[4] Tech Univ Dresden, Inst Werkstoffwissensch, D-01062 Dresden, Germany

来源：

ACTA MATERIALIA | 2010年 / 58卷 / 14期

关键词：

Bulk metallic glasses; Tensile tests; Ductility; Twinning; Martensitic transformation; MECHANICAL-PROPERTIES; AMORPHOUS-ALLOYS; SHEAR BANDS; MARTENSITIC-TRANSFORMATION; INTERMETALLIC COMPOUND; ALUMINUM-ALLOYS; DEFORMATION; MICROSTRUCTURE; COMPOSITES; NANOCRYSTALLIZATION;

D O I：

10.1016/j.actamat.2010.05.026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

(Cu0.5Zr0.5)(100-x)Al-x (x = 5, 6, 8) bulk metallic glasses (BMGs) were deformed in tension. Besides ductility up to 0.5%, the material shows work-hardening behaviour. Both effects are attributed to the deformation-induced precipitation of B2 CuZr nanocrystals and the formation of twins in the nanocrystals larger than 20 nm. The precipitation of the nanocrystals alters the stress field in the matrix and is expected to retard shear band propagation, which in turn allows stresses in the nanocrystals to rise. This stress build-up is more severe in the larger grains and might be responsible for the subsequent twinning. Both deformation-induced nanocrystallization and twinning consume energy and avoid crack formation and with it premature failure. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4883 / 4890

页数：8

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