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Materials 2016, 9(6), 408; doi:10.3390/ma9060408

A Series of Zr-Based Bulk Metallic Glasses with Room Temperature Plasticity

1
College of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414000, China
2
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
3
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4
School of Physics and Electronics, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Peter J. Uggowitzer
Received: 18 April 2016 / Revised: 10 May 2016 / Accepted: 17 May 2016 / Published: 25 May 2016
(This article belongs to the Section Structure Analysis and Characterization)

Abstract

A group of plastic Zr-Al-Ni-Cu bulk metallic glasses (BMGs) with low Zr content was developed and their thermal and mechanical properties were investigated. The results show that these Zr-based BMGs have a single crystallization event for all heating rates in the studied temperature region. The glass transition temperature Tg decreases with increasing Zr content for all heating rates. There are two melting procedures for the BMGs whose Zr content is less than 52 at %, while three melting procedures for the other Zr-based BMGs. The second melting procedure is split into two melting procedures for Zr52.5Al12.2Ni12.6Cu22.7 and Zr53Al11.6Ni11.7Cu23.7 BMGs, while the first melting procedure is split into two melting procedures for the other BMGs. The activation energy decreases with increasing sensitivity index β for the studied Zr-based BMGs. The plastic strain εp is in the region of 0.2%–19.1% for these Zr-based BMGs. Both yield strength σy and fracture strength σf are smallest for Zr55Al8.9Ni7.3Cu28.8 BMG whose εp is largest among all studied Zr-based BMGs and reaches up to 19.1%. In addition, the mechanism for the large difference of the plasticity among the studied Zr-based BMGs is also discussed. View Full-Text
Keywords: Zr-based bulk metallic glass; plasticity; mechanical property Zr-based bulk metallic glass; plasticity; mechanical property
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cai, A.; Ding, D.; Liu, Y.; Wu, H.; An, W.; Zhou, G.; Luo, Y.; Peng, Y. A Series of Zr-Based Bulk Metallic Glasses with Room Temperature Plasticity. Materials 2016, 9, 408.

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