Amorphous/crystalline Zn60Zr40 Alloys Lattice Structures with Improved Mechanical Properties Fabricated by Mechanical Alloying and Selective Laser Melting
Virtual and physical prototyping(2023)
摘要
In the present study, mechanical alloying (MA) was employed for synthesising non-equilibrium Zn60Zr40 amorphous powders, and then consolidated into amorphous/crystalline Zn60Zr40 alloys using selective laser melting (SLM). The results showed that the MA process destabilised the atomic periodicity of Zn and Zr powders and induced crystalline-to-amorphous transformation due to atomic size mismatch and negative heat of mixing. Moreover, the amorphisation trend of as-milled powders was intensified with increasing milling time and attained almost fully amorphous structure after 30 h of milling. During SLM, the ultra-high cooling rate restricted the long-range atomic diffusion of the amorphous powders and enabled successful survival of amorphous phase, leading to amorphous/crystalline Zn60Zr40 alloys. The alloys exhibited a maximum compressive yield strength and microhardness of 160.9 & PLUSMN; 9.1 MPa and 3.73 & PLUSMN; 0.8 GPa, respectively. These findings demonstrated that the developed MA-SLM process might be a promising strategy for the preparation of amorphous/crystalline alloys with superior properties.
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关键词
Mechanical alloying,selective laser melting,amorphous,crystalline,Zn60Zr40 alloys,mechanical properties
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