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Differences in surface mechanical properties of Zr-based bulk metallic glass related to stress condition
Materials Letters ( IF 3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.matlet.2020.127315
Zhichao Ma , Hongwei Zhao , Xiaoxi Ma , Kaiyang Zeng , Luquan Ren

Abstract Differences in surface mechanical properties of Zr55Cu30Al10Ni5 bulk metallic glass (BMG) was revealed through indentation tests. Inhomogeneous stress condition was constructed through fabricating asymmetrical double V-notches. Indentation responses at various locations along with and perpendicular to the connection line between the notch tips indicated a significant difference in surface hardness with range from 1.012 GPa to 1.463 GPa, corresponding to a tensile stress ranging from 11.8 MPa to 246.3 MPa. The stress gradients induced by prefabricted notches cased the anisotropy of residual indentation morphologies. Furthermore, selected area electron diffraction analysis adjacent to the notch tip exhibited typical halo ring and amorphous state, which indicated that the morphological anisotropy and differences in indentation responses were mainly caused by inhomogeneous stress and Poisson effect rather than local crystallization behaviors.

中文翻译:

Zr基块体金属玻璃表面力学性能与应力条件相关的差异

摘要 通过压痕试验揭示了Zr55Cu30Al10Ni5块状金属玻璃(BMG)表面力学性能的差异。通过制造不对称的双 V 形缺口来构建非均匀应力条件。沿和垂直于缺口尖端之间的连接线的不同位置的压痕响应表明表面硬度存在显着差异,范围为 1.012 GPa 至 1.463 GPa,对应的拉伸应力范围为 11.8 MPa 至 246.3 MPa。由预制凹口引起的应力梯度反映了残余压痕形态的各向异性。此外,与凹口尖端相邻的选区电子衍射分析显示出典型的晕环和非晶态,
更新日期:2020-04-01
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