Journal of Materials Research

Articles

Influence of casting temperature on microstructures and mechanical properties of Cu50Zr45.5Ti2.5Y2 metallic glass prepared using copper mold casting

Zhengwang Zhua1, Haifeng Zhanga2 c1, Hao Wanga3, Bingzhe Ding, Zhuang-Qi Hua4 and Han Huanga5

a1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; and Faculty of Engineering and Surveying, The University of Southern Queensland, Toowoomba, Queensland 4350, Australia

a2 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

a3 Faculty of Engineering and Surveying, The University of Southern Queensland, Toowoomba, Queensland 4350, Australia

a4 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

a5 Division of Mechanical Engineering, School of Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia

Abstract

The influence of casting temperatures on microstructures and mechanical properties of rapidly solidified Cu50Zr45.5Ti2.5Y2 alloy was investigated. With increasing casting temperatures, the amount of the crystalline phase decreases. At a high casting temperature, i.e., 1723 K, glass-forming ability (GFA) of the present alloy is enhanced. The results imply that adjusting the casting temperature could be used for designing the microstructures of bulk metallic glass matrix composite. Nanoindentation tests indicated that CuZr phases are slightly softer and can accommodate more plastic deformation than the amorphous matrix. Compression tests confirmed that this kind of second phase (CuZr) precipitated under lower casting temperatures helps to initiate multiple shear bands, resulting in a great improvement in mechanical properties of the samples. Our work indicates that casting temperatures have a great influence on GFA, microstructures, and mechanical properties of the rapidly solidified alloy, therefore controlling the casting temperature is crucial to the production of BMGs.

(Received March 17 2009)

(Accepted May 06 2009)

Key Words:

  • Amorphous;
  • Microstructure;
  • Rapid solidification

Correspondence:

c1 Address all correspondence to this author.e-mail:hfzhang@imr.ac.cn

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