Plastic deformation of a Zr-based bulk metallic glass fabricated by selective laser melting
Plastic deformation of a Zr-based bulk metallic glass fabricated by selective laser melting
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DOI：
10.1016/j.jmst.2020.06.007
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发表时间：
2021-01-10
影响因子：
10.9
通讯作者：
Pauly, S.
中科院分区：
文献类型：
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作者：
Deng, L.;Kosiba, K.;Pauly, S.
通过选择性激光熔化（SLM）技术制备了相对密度超过 98% 的全非晶 Zr52.5Cu17.9Ni14.6Al10Ti5 大块金属玻璃（BMG）样品。圆柱形 SLM 样品获得了约 1700 MPa 的高断裂应力和约 0.5% 的可再现塑性应变。对压缩加载期间观察到的锯齿的分析表明，增材制造样品中的剪切带动力学与铸态玻璃的剪切带动力学明显不同。这种现象似乎源于均匀分散的球形孔的存在以及仪器压痕所揭示的玻璃本身更明显的不均匀性。尽管存在这些不均匀性，剪切带是直的并且形成在最大剪切应力的平面中。因此，增材制造不仅可以生产具有复杂几何形状的大型 BMG 样品，还可以通过定制孔隙率和结构异质性来控制其变形行为。 (C) 2020 由Elsevier Ltd 代表Journal of Materials Science & Technology 编辑部出版。
Fully amorphous Zr52.5Cu17.9Ni14.6Al10Ti5 bulk metallic glass (BMG) samples with a relative density exceeding 98% were fabricated via selective laser melting (SLM). High fracture stresses of around 1700 MPa and a reproducible plastic strain of about 0.5% were obtained for cylindrical SLM samples. The analysis of the observed serrations during compressive loading implies that the shear-band dynamics in the additively manufactured samples distinctly differ from those of the as-cast glass. This phenomenon appears to originate from the presence of uniformly dispersed spherical pores as well as from the more pronounced heterogeneity of the glass itself as revealed by instrumented indentation. Despite these heterogeneities, the shear bands are straight and form in the plane of maximum shear stress. Additive manufacturing, hence, might not only allow for producing large BMG samples with complex geometries but also for manipulating their deformation behaviour through tailoring porosity and structural heterogeneity. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.