||Calphad-assisted design of the Al-Co-Cr-Fe-Ni multiprincipal component alloys with high strength and high ductility
||Department of Materials Science and Engineering
Multiprincipal component alloys
Multiprincipal component alloys, also known as high-entropy alloys, are a new concept of alloys that breaks through the limitation of traditional alloy design which is usually based on one or, at most two key elements, and uses multiple principal elements to form alloys. In this study, the Al-Co-Cr-Fe-Ni system was used as the research object. The CALPHAD approach was used to predict the phase formation and understand the impact of each element. It’s hoped that CALPHAD can be used to find the correlation between alloy composition, phase volume fraction and mechanical properties, and design an Al-Co-Cr-Fe-Ni multiprincipal component alloy with high strength and high ductility. The results show that in the Al-Co-Cr-Fe-Ni system, Co and Ni are FCC phase stabilizers, Cr is a BCC phase stabilizer, Al is a B2 phase stabilizer, and Fe is a neutral element. CALPHAD can accurately simulate the reaction of Al-Co-Cr-Fe-Ni multi-principal component alloy during the solidification process and the phase type in the as-cast structure, but the values of volume fraction are inaccurate with the experimental values. By precipitating B2 and L12 from the FCC matrix, the target alloy appears high strength and high ductility, and its YS, UTS and elongation are 470 MPa, 790 MPa, and 48%, respectively.
第一章 前言 1
第二章 文獻回顧 2
2.3 CALPHAD 14
2.3.1 CALPHAD的原理與特點 14
2.3.2 CALPHAD於多主元合金設計的應用 18
2.4 Al-Co-Cr-Fe-Ni系統多主元合金 23
2.4.3 CALPHAD於Al-Co-Cr-Fe-Ni系統多主元合金的研究 32
第三章 實驗方法與步驟 35
第四章 結果與討論 52
第五章 結論 100
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