Nanoscale creep behavior and its size dependency of a Zr-based bulk metallic glass manufactured by selective laser melting

Materials & Design

Yuequn Fu¹  Yuyu Liu²  Wenxian Wang³  Jianying He⁴  Zhiliang Zhang⁵  Meichao Lin⁵  Xiaobo Ren⁵  Siqi Liu⁵  Zexin Chang⁵ 

[1]College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, PR China

[2]College of Materials Science and Engineering, Taiyuan University of Technology, 79 West Yingze Street, Taiyuan 030024, PR China

[3]School of Material Science and Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, PR China

[4]Materials and Nanotechnology, SINTEF Industry, NO‐7465 Trondheim, Norway

[5]NTNU Nanomechanical Lab, Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway

关键词: Bulk metallic glass;    Additive manufacturing;    Selective laser melting;    Shear transformation zone;    Nanoindentation;    Creep behavior;   

DOI  :  

来源: DOAJ

【 摘 要 】

Nanoscale creep behaviors of metallic glasses (MGs) have gathered considerable interests in recent years, owing to their distinct atomistic mechanisms of plasticity. Additive manufacturing (AM) is a burgeoning technique for manufacturing MGs, the nanoscale creep characteristics and creep mechanism of the AM-ed MGs, however, remain ambiguous. In this work, the nanoscale creep behavior and creep size effect of a selective laser melted (SLM-ed) Zr-based MG were investigated by using nanoindentation. The creep stress exponent (n) and shear transformation zone (STZ) volume, as the indicators of the creep mechanism, were estimated. The n values are in the range of 2–3, and STZ volumes are around 2 nm3. The creep resistance of the MG was found to decrease with the increasing applied peak loads. A potential mechanism for this creep size effect was revealed: the smaller of the STZ volume, as well as the greater ratio of plastic flow under the higher maximum load, are responsible for the decreasing tendency of creep resistance. This research gives a comprehensive understanding of the atomistic mechanisms in the AM-ed MG during the nanoscale creep deformation process and can serve as a reference for improving the plasticity and further engineering applications.

【 授权许可】

Unknown