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Materials Science and Technology Volume 28, 2012 - Issue 2
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Short communication

Mechanical behaviours of workhardening and worksoftening bulk metallic glasses

W H JiangDepartment of Materials Science and Engineering, The University of Tennessee, Knoxville, TN37996, USACorrespondence[email protected]
,
F JiangDepartment of Materials Science and Engineering, The University of Tennessee, Knoxville, TN37996, USA
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F X LiuDepartment of Materials Science and Engineering, The University of Tennessee, Knoxville, TN37996, USA
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Y D WangKey Laboratory for Anisotropy and Texture of Materials (MOE), Northeastern University, Shenyang110004, China
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H M DangDepartment of Chemical and Materials Engineering, University of Kentucky, Lexington, KY40506, USA
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F Q YangDepartment of Chemical and Materials Engineering, University of Kentucky, Lexington, KY40506, USA
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H ChooDepartment of Materials Science and Engineering, The University of Tennessee, Knoxville, TN37996, USA;Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN37831, USA
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P K LiawDepartment of Materials Science and Engineering, The University of Tennessee, Knoxville, TN37996, USA
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Pages 249-255 | Received 06 Nov 2010, Accepted 15 Jan 2011, Published online: 12 Nov 2013
 
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Abstract

The workhardening Cu47·5Zr47·5Al5 and the worksoftening Zr52·5Cu17·9Ni14·6Al10·0Ti5·0 bulk metallic glasses before and after precompression deformation were characterised for thermal and mechanical behaviours. The predeformation introduces excessive free volume in both glasses. Cu47·5Zr47·5Al5 and Zr52·5Cu17·9Ni14·6Al10·0Ti5·0 exhibit substantial workhardening and worksoftening behaviours respectively. For Cu47·5Zr47·5Al5, the precompression has a negligible effect on serrations in the plastic flow during nanoindentation, which is related to the hardening of a shear band, while for Zr52·5Cu17·9Ni14·6Al10·0Ti5·0, the precompression moderates serrations in the plastic flow during nanoindentation, which is associated with the softening of a shear band. Strengthening from mechanically induced nanocrystallites at shear bands is responsible for the workhardening of Cu47·5Zr47·5Al5, which overwhelms softening due to the introduction of excessive free volume.

The present work was supported by the National Science Foundation (NSF) International Materials Institutes (IMI) Program (grant no. DMR-0231320), with Dr C. Huber as the Program Director. YDW thanks the financial support by the National Natural Science Foundation of China (grant no. 50725102).

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