Elemental partitioning as a route to design precipitation-hardened high entropy alloys
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第13期
论文作者：Feng He Bin Han Zhongsheng Yang Da Chen Guma Yeli Yang Tong Daixiu Wei Junjie Li Zhijun Wang Jincheng Wang Ji-jung Kai
摘 要：Precipitation-hardened high entropy alloys（HEAs） with carefully tuned compositions have shown excellent mechanical properties,demonstrating great potential for engineering applications.However,due to the lack of precise multiple phase diagrams,the composition design of multi-principal-component HEAs still inevitably relies on the extremely time-consuming trial-and-error approach.The present study,on the basis of powerful composition quantification ability of atom probe tomography（APT） technology,proposed a framework to guide the quantitative design of precipitation-hardened HEAs.In this framework,the elemental partitioning was used as a crucial route to avoid the thermodynamic challenge of designing precipitation-hardened HEAs.As a case study,the role of Ti/Al ratio in the design of γ-γ’ HEAs was predicted through the proposed framework and then validated by experimental studies.The framework predicted that when the total content of Ti and Al is fixed,a higher Ti/Al ratio makes γ-γ’ HEA stronger.APT and mechanical results agreed well with these predictions and validated the feasibility of the framework.These findings provided a new route to design the precipitation-hardened alloys and a deeper insight into the design of γ-γ’ HEA.
Feng He1,2，Bin Han1,3，Zhongsheng Yang2，Da Chen1,4，Guma Yeli1，Yang Tong5，Daixiu Wei6，Junjie Li2，Zhijun Wang2，Jincheng Wang2，Ji-jung Kai1,4
1. Centre for Advanced Nuclear Safety and Sustainable Development, City University of Hong Kong2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University3. Institute of Atomic and Molecular Science, Shaanxi University of Science and Technology4. Department of Mechanical Engineering, City University of Hong Kong5. Division of Materials Science and Technology, Oak Ridge National Laboratory6. Institute for Materials Research, Tohoku University
摘 要：Precipitation-hardened high entropy alloys（HEAs） with carefully tuned compositions have shown excellent mechanical properties,demonstrating great potential for engineering applications.However,due to the lack of precise multiple phase diagrams,the composition design of multi-principal-component HEAs still inevitably relies on the extremely time-consuming trial-and-error approach.The present study,on the basis of powerful composition quantification ability of atom probe tomography（APT） technology,proposed a framework to guide the quantitative design of precipitation-hardened HEAs.In this framework,the elemental partitioning was used as a crucial route to avoid the thermodynamic challenge of designing precipitation-hardened HEAs.As a case study,the role of Ti/Al ratio in the design of γ-γ’ HEAs was predicted through the proposed framework and then validated by experimental studies.The framework predicted that when the total content of Ti and Al is fixed,a higher Ti/Al ratio makes γ-γ’ HEA stronger.APT and mechanical results agreed well with these predictions and validated the feasibility of the framework.These findings provided a new route to design the precipitation-hardened alloys and a deeper insight into the design of γ-γ’ HEA.
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