TiZrHfNbMo难熔高熵合金等离子体氢化及力学性能

Plasma Hydrogenation and Mechanical Properties of TiZrHfNbMo Refractory High-entropy Alloy

为了改善难熔高熵合金的热加工性,通过等离子辅助气体合金化的方式,在熔炼气氛中通入H;和Ar的混合气体,使氢溶入TiZrHfNbMo难熔高熵合金中。研究了不同H含量下,TiZrHfNbMo难熔高熵合金组织和力学性能的变化规律。结果表明,H的存在并没有改变合金相组成,但室温压缩强度、硬度、伸长率有所下降,伸长率从21%降至19%,H的加入显著细化了枝晶间距,减少二次枝晶臂数量及尺寸。置氢以后的合金高温流动应力从622 MPa降至498 MPa。

In order to improve the hot working ability of refractory high entropy alloys, the mixture gas of H;and Ar was introduced into the melting atmosphere by plasma assisted gas alloying, so that hydrogen was dissolved into Ti Zr Hf NbMo refractory high entropy alloys. The microstructures and properties of TiZrHfNbMo refractory high-entropy alloy under different H contents were studied. The results show that H does not change the composition of the alloy phase, but the compressive strength, hardness and elongation at room temperature decrease, and the elongation decreases from 21% to 19%.H addition significantly refines the dendrite spacing and reduces the number and size of secondary dendrite arms. The high temperature flow stress of the alloy after hydrogenating decreases from 622 to 498 MPa.