Plastic deformation of a Zr-based bulk metallic glass fabricated by selective laser melting

• 作 者: L.Deng K.Kosiba R.Limbach L.Wondraczek U.Kühn S.Pauly
• 机 构: IFW Dresden,Institute for Complex Materials,Helmholtzstra?e 20,D-01069,Dresden,Germany;Otto Schott I
• 出 处: 材料科学技术（英文版）
• 发表日期: 2021年1期
• 关键词: Powder bed fusion Selective laser melting Bulk metallic glass Serrated flow Hete

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 geome-tries but also for manipulating their deformation behaviour through tailoring porosity and structural heterogeneity.