Influence of thin-film metallic glass coating on fatigue behavior of bulk metallic glass: Experiments and finite element modeling

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:692

Article

Yu, Chia-Chi¹  Chu, Jinn P.¹  Jia, Haoling²  Shen, Yu-Lin³  Gao, Yanfei²  Liaw, Peter K.²  Yokoyama, Yoshihiko⁴ 

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

[2] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[3] Univ New Mexico, Dept Mech Engn, Albuquerque, NM 87131 USA

[4] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

关键词: Metallic glass;    Four-point-bend fatigue;    Shear band;    Finite-element modeling;   

DOI  :  10.1016/j.msea.2017.03.071

来源: Elsevier

【 摘 要 】

A coating of the Zr-based thin-film metallic glass (TFMG) was deposited on the Zr50Cu30Al10Ni10 bulk metallic glass (BMG) to investigate shear-band evolution under four-point-bend fatigue testing. The fatigue endurance limit of the TFMG-coated samples is 33% higher than that of the BMG. The results of finite-element modeling (FEM) revealed a delay in the shear-band nucleation and propagation in TFMG-coated samples under applied cyclic-loading. The FEM study of spherical indentation showed that the redistribution of stress by the TFMG coating prevents localized shear-banding in the BMG substrate. The enhanced fatigue characteristics of the BMG substrates can be attributed to the TFMG coatings retarding shear-band initiation at defects on the surface of the BMG.

【 授权许可】

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