Plasticity enhancement of Zr-based bulk metallic glasses by direct current electropulsing

JOURNAL OF ALLOYS AND COMPOUNDS

卷:525

Article

Yiu, P.¹  Jang, J. S. C.²  Chang, S. Y.³  Chen, Y. C.⁴  Chu, J. P.⁴  Hsueh, C. H.¹ 

[1] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 10617, Taiwan

[2] Natl Cent Univ, Inst Mat Sci & Engn, Jhongli 32001, Taiwan

[3] Natl Chung Hsing Univ, Dept Mat Sci & Engn, Taichung 402, Taiwan

[4] Natl Taiwan Univ Sci & Technol, Dept Mat Sci & Engn, Taipei 10607, Taiwan

关键词: Metallic glasses;    Amorphous materials;    Mechanical properties;    Nanoindentation;    Shear band;    Electropulsing;   

DOI  :  10.1016/j.jallcom.2012.02.074

来源: Elsevier

【 摘 要 】

Direct current electropulsing was used to improve the plasticity of (Zr53Cu30Ni9Al8)(99.5)Si-0.5 bulk metallic glasses. After the electropulsing treatment, the specimen showed reductions in both the glass transition and the crystallization temperatures while retaining its amorphous structure, and both Young's modulus and the hardness decreased while the nanoindentation loading curve became more serrated. Using the bond-interface method and Vickers indentation, the treated specimen showed more branching of semicircular shear bands and less radial shear bands compared to its as-cast counterpart. The possible plasticity enhancement mechanism of the electropulsing treatment was also discussed. (C) 2012 Elsevier B. V. All rights reserved.

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