Characteristics of the Cold-Rolled Multi-Phase Cr30Fe30Ni15Co10Cu10Ti5 High-Entropy Alloy

Ahad Rezaee; Mostafa Ketabchi; Seyed Amir Arsalan Shams; Hamid Reza Jafarian; Chong Soo Lee

doi:10.1007/s12540-022-01296-4

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자료유형: 학술저널

저자정보: Ahad Rezaee (Amirkabir University of Technology (Tehran Polytechnic)) Mostafa Ketabchi (Amirkabir University of Technology (Tehran Polytechnic)) Seyed Amir Arsalan Shams (Pohang University of Science and Technology) Hamid Reza Jafarian (Iran University of Science and Technology (IUST)) Chong Soo Lee (Pohang University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.5

발행연도: 2023.5

수록면: 1,366 - 1,381 (16page)

DOI: 10.1007/s12540-022-01296-4

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Microstructure and mechanical behavior of a non-equiatomic Cr30Fe30Ni15Co10Cu10Ti5high-entropy alloy were investigatedduring cold rolling. The alloy was cast by vacuum arc melting and after homogenization, it was hot rolled and solutionannealed. The as-cast microstructure consisted of two face-centered cubic (FCC1: Ni-rich, FCC2: Cu-rich) and a hardCr-rich σ phases. The dendritic structure disappeared after solution annealing and the σ phase partially transformed to asofter phase with a body-centered cubic (BCC) structure. The addressed thermomechanical process was found to result infavorable microstructural characteristics, which provided the possibility of subsequent heavy cold rolling up to 85% thicknessreduction. Results indicated that while no phase transformation was detected during the cold rolling, the plastic deformationfollowed the dislocation slip mechanism at the early stages. The formation of mechanical twinning and shear bands werealso identified as the main plastic deformation mechanisms at the higher levels of cold rolling in FCC1. In addition, grainrefinement by dynamic recrystallization mechanism was observed in the BCC phase. However, the grain size of the Cu-richphase was refined to < 500 nm after just a 25% thickness reduction. Although a small number of interfacial and intergranularcracks were initiated in some of the σ phase particles, a good material flow was observed around this hard phase. The resultsalso showed that applying 85% cold rolling lead to a significant increase in ultimate tensile strength (UTS) of the materialto 1794 MPa. However, the optimum combination of UTS and elongation (1267 MPa and 31%, respectively) was achievedafter thickness reduction of 40%.

#Non-equiatomic high-entropy alloy · Cold rolling · Deformation mechanism · Mechanical properties

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