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Grain Refinement of CrCoNi Multi-principal-element Alloy

Grain Refinement of CrCoNi Multi-principal-element Alloy

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第十三届全国铸造年会暨2016中国铸造活动周

作者： Liu Xinwang Guillaume Laplanche AleksANDer Kostka Suzana G.Fries janine pfetzing-micklich Liu Gang Fan Zitian Easo P.George Department of Materials Design Ruhr-University Bochum State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Interdisciplinary Centre for Advanced Materials Simulation Ruhr-University Bochum

The equiatomic multi-principal-element alloy, CrCoNi, as a single-phase FCC solid solution, displays excellent strength-toughness properties that exceed those of all high entropy alloys, which is considered as a promising engineering alloy at cryogenic temperatures. Cast, as a common-used method to form complex-shaped components, is a necessary technique for engineering alloys, whereas the cast multi-principal-element alloys have not be systematically investigated previously. Here we study the grain refinement of cast CrCoNi alloy and their corresponding mechanical properties. The alloys were produced by arc melting and drop casting, which are much simpler than the preparation procedures of deformed alloys by cold deformation and recrystallization in the previous studies. The cast CrCoNi alloy consists with anisotropic coarse columnar grains with the average width of more than 210 m. Their microstructures, however, become equiaxed grains after grain modification which exhibit uniform fine equiaxed grains with the size of 76 m nearly throughout the entire ingots. The tensile tests at an engineering strain rate of 10-3 s-1 reveals that yield strength, ultimate tensile strength and elongation to fracture are all improved by grain refinement both at 293 and 77 K. Meanwhile, the cast alloy shows the comparable mechanical properties with the alloys after cold working and recrystallization. The corresponding mechanism was also discussed related to the constitutional supercooling.

关键词： multi-principal-element alloy grain refinement microstructures tensile properties

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