Microstructure and mechanical properties of Fe-based bulk metallic glass composites fabricated by selective laser melting

摘要

Selective laser melting of ductile Cu particles reinforced Fe-based bulk metallic glass composites (Fe-based BMGCs) were used to break geometric complexity limitations and improve the mechanical properties. In this work, the effects of Cu content on microstructure, mechanical properties and fracture deformation behavior of Fe-based BMCGs were systematically investigated. The appropriate Cu addition can decrease stress concentration by altering elements distribution, especially C element which will increase the brittleness of BMGs and lead to crack formation. The crack-free Fe-based BMGCs with a well bonding interface between the secondary phase and matrix is presented with 40 vol.% Cu addition. The improved plasticity of BMGCs with Cu addition originates from the inhibition of shear bands via formation of multiple shear bands. This work demonstrates that introducing tough secondary phase into BMGs is an effective method to improve their formability and performance.

关键词