微合金化对铁基无磁中熵合金组织、力学和磁学性能的影响.

A medium entropy alloy (Fe63.3Mn14Si9.1Cr9.8C3.8)100-xYx(Y=Ag, Cu) was fabricated via a water cooled copper crucible magnetic levitation melting and copper mold negative pressure suction casting method. The effects of adding Ag and Cu elements micro alloying on the stacking fault energy, microstructure, mechanical properties and magnetic properties of the alloy were studied by XRD, SEM and VSM. The results show that the alloy contains fee phase and low stacking fault energy. The addition of diamagnetic elements Ag and Cu further reduces stacking fault and refines grain size, decreases the yield strength and improves the fracture strength and plasticity. The fracture strength and plasticity of(Fe63.3Mn14Si9.1Cr9.8C3.8)99.6Cu0.4 alloy are up to (2 435 ± 1) MPa and (22.2±0.1)%, respectively, while the relative permeability is just 1.00013, thus indicating excellent mechanical properties and paramagnetism. [ABSTRACT FROM AUTHOR]