Enhanced cavitation erosion resistance of a friction stir processed high entropy alloy
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第10期
论文作者：Rakesh B.Nair H.S.Arora Harpreet Singh Grewal
文章页码：1353 - 1362
摘 要：Friction stir processing of an Al0.1CoCrFeNi high entropy alloy（HEA） was performed at controlled cooling conditions（ambient and liquid submerged）. Microstructural and mechanical characterization of the processed and as-cast HEAs was evaluated using electron backscatter diffraction, micro-hardness testing and nanoindentation. HEA under the submerged cooling condition showed elongated grains（10 μm）with fine equiaxed grains（2 μm） along the boundary compared to the coarser grain（～2 mm） of as-cast HEA. The hardness showed remarkable improvements with four（submerged cooling condition） and three（ambient cooling condition） times that of as-cast HEA（HV ～150）. The enhanced hardness is attributed to the significant grain refinement in the processed HEAs. Cavitation erosion behavior was observed for samples using an ultrasonication method. All of the HEAs showed better cavitation erosion resistance than the stainless steel 316 L. The sample processed under a submerged liquid condition showed approximately 20 and 2 times greater erosion resistance than stainless steel 316 L and ascast HEA, respectively. The enhanced erosion resistances of the processed HEAs correlate to their increased hardness, resistance to plasticity,and better yield strength than the as-cast HEA. The surface of the tested samples showed nucleation and pit growth, and plastic deformation of the material followed by fatigue-controlled disintegration as the primary material removal mechanism.
Rakesh B.Nair，H.S.Arora，Harpreet Singh Grewal
摘 要：Friction stir processing of an Al0.1CoCrFeNi high entropy alloy（HEA） was performed at controlled cooling conditions（ambient and liquid submerged）. Microstructural and mechanical characterization of the processed and as-cast HEAs was evaluated using electron backscatter diffraction, micro-hardness testing and nanoindentation. HEA under the submerged cooling condition showed elongated grains（10 μm）with fine equiaxed grains（2 μm） along the boundary compared to the coarser grain（～2 mm） of as-cast HEA. The hardness showed remarkable improvements with four（submerged cooling condition） and three（ambient cooling condition） times that of as-cast HEA（HV ～150）. The enhanced hardness is attributed to the significant grain refinement in the processed HEAs. Cavitation erosion behavior was observed for samples using an ultrasonication method. All of the HEAs showed better cavitation erosion resistance than the stainless steel 316 L. The sample processed under a submerged liquid condition showed approximately 20 and 2 times greater erosion resistance than stainless steel 316 L and ascast HEA, respectively. The enhanced erosion resistances of the processed HEAs correlate to their increased hardness, resistance to plasticity,and better yield strength than the as-cast HEA. The surface of the tested samples showed nucleation and pit growth, and plastic deformation of the material followed by fatigue-controlled disintegration as the primary material removal mechanism.
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