Effect of cooling rate on plastic deformation of Zr-based bulk metallic glasses

The effect of cooling rate on plastic deformation of Zr-based bulk metallic glasses has been studied.The specimens with the diameters of 3 mm,4 mm and 6 mm cut from the same ladder-shaped Zr 55 Al 10 Ni 5 Cu 30 BMG rod were used in the present investigation.The experimental results indicated that th...

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Bibliographic Details
Published in:Progress in natural science 2012-01, Vol.22 (1), p.21-25
Main Authors: Li, Chunyan, Kou, Shengzhong, Zhao, Yanchun, Liu, Guangqiao, Ding, Yutian
Format: Article
Language:English
Subjects:
Bulk
Bulk metallic glasses
Cooling
Cooling rate
deformation
Free
Free volume
glasses
metallic
Plastic
Plastic deformation
rate
Serration
volume
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Summary:The effect of cooling rate on plastic deformation of Zr-based bulk metallic glasses has been studied.The specimens with the diameters of 3 mm,4 mm and 6 mm cut from the same ladder-shaped Zr 55 Al 10 Ni 5 Cu 30 BMG rod were used in the present investigation.The experimental results indicated that the different plastic strains were induced for the three type compression specimens.The compressive plastic strain increased with the decreasing diameter for the as-cast specimens,which means that the compressive plastic strain increased with the increasing cooling rate.The reason of the difference is attributed to the free volume existed in the BMGs during the rapid solidification,and the larger free volume was contained in the specimen fabricated with the higher cooling rate.It has been found that the prominent serrations and multiple shear bands appeared during the compressive deformation tests of the specimen with smaller diameter of 3 mm,indicating that the specimen with smaller diameter exhibits better plasticity due to more free volume content.
ISSN:1002-0071
DOI:10.1016/j.pnsc.2011.12.004