Tailoring mechanical and magnetic properties of AlCoCrFeNi high-entropy alloy via phase transformation
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第14期
论文作者：Chendong Zhao Jinshan Li Yudong Liu William Yi Wang Hongchao Kou Eric Beaugnon Jun Wang
摘 要：Phase constitutions,either changed by alloying or by phase transformation,are the key factors to determine the magnetic and mechanical performances of high-entropy alloys（HEAs）.Using the AlCoCrFeNi HEA as a candidate alloy,this paper demonstrates the effect of phase transformation on both the mechanical and magnetic properties in the multi-phase system.With increasing heat treatment temperature,the sigma（σ） and face-centered-cubic（FCC） phases disappeared at 1000℃ and 1200℃,respectively.Such volume fraction changes of σ,FCC and body-centered-cubic（BCC） phases have divergent effects on mechanical and magnetic properties.The excellent strength-ductility combination will be achieved as the disappearance of σ phase and formation of FCC phase.As for the magnetic properties,the volume fraction of BCC phase plays a major role in determining its saturation magnetization.When the volume fraction change of BCC phase is not evident,the higher volume fraction of FCC phase will influence its magnetization at 2 T.Our present work might provide insights into analyzing the evolution of both mechanical and magnetic properties of HEAs caused by complex phase transformation.
Chendong Zhao1，Jinshan Li1，Yudong Liu1，William Yi Wang1，Hongchao Kou1，Eric Beaugnon2，Jun Wang1
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University2. Univ.Grenoble Alpes, INSA Toulouse, Univ.Toulouse Paul Sabatier, EMFL,CNRS, LNCMI
摘 要：Phase constitutions,either changed by alloying or by phase transformation,are the key factors to determine the magnetic and mechanical performances of high-entropy alloys（HEAs）.Using the AlCoCrFeNi HEA as a candidate alloy,this paper demonstrates the effect of phase transformation on both the mechanical and magnetic properties in the multi-phase system.With increasing heat treatment temperature,the sigma（σ） and face-centered-cubic（FCC） phases disappeared at 1000℃ and 1200℃,respectively.Such volume fraction changes of σ,FCC and body-centered-cubic（BCC） phases have divergent effects on mechanical and magnetic properties.The excellent strength-ductility combination will be achieved as the disappearance of σ phase and formation of FCC phase.As for the magnetic properties,the volume fraction of BCC phase plays a major role in determining its saturation magnetization.When the volume fraction change of BCC phase is not evident,the higher volume fraction of FCC phase will influence its magnetization at 2 T.Our present work might provide insights into analyzing the evolution of both mechanical and magnetic properties of HEAs caused by complex phase transformation.
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