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Enhanced cavitation erosion resistance of a friction stir processed high entropy alloy
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-07-27 , DOI: 10.1007/s12613-020-2000-9
Rakesh B. Nair , H. S. Arora , Harpreet Singh Grewal

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 316L. The sample processed under a submerged liquid condition showed approximately 20 and 2 times greater erosion resistance than stainless steel 316L 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.



中文翻译:

搅拌摩擦加工的高熵合金的抗气蚀性能增强

Al 0.1的搅拌摩擦加工CoCrFeNi高熵合金(HEA)在受控的冷却条件下(环境和液体浸没)进行。使用电子背散射衍射,显微硬度测试和纳米压痕评估了已加工和铸态HEA的微观结构和力学特性。浸没冷却条件下的HEA与沿铸态HEA的较粗晶粒(〜2 mm)相比,在边界处显示出拉长的晶粒(10 µm)和细等轴晶粒(2 µm)。在铸态HEA(HV〜150)的四倍(浸没冷却条件)和三倍(环境冷却条件)下,硬度显示出显着的提高。硬度的提高归因于加工过的HEA中的明显晶粒细化。使用超声方法观察了样品的空化侵蚀行为。与HEA 316L相比,所有HEA都显示出更好的抗气蚀性。在浸没液体条件下处理的样品的耐蚀性分别比不锈钢316L和铸态HEA高20倍和2倍。与铸态HEA相比,已加工的HEA增强的耐蚀性与其硬度,抗塑性和更好的屈服强度有关。测试样品的表面显示出成核和凹坑生长,材料的塑性变形,随后是疲劳控制的崩解,这是主要的材料去除机理。与铸态HEA相比,已加工的HEA增强的耐蚀性与其硬度,抗塑性和更好的屈服强度有关。测试样品的表面显示出成核和凹坑生长,材料的塑性变形,然后是疲劳控制的崩解,这是主要的材料去除机理。与铸态HEA相比,已加工的HEA增强的耐蚀性与其硬度,可塑性和更好的屈服强度有关。测试样品的表面显示出成核和凹坑生长,材料的塑性变形,随后是疲劳控制的崩解,这是主要的材料去除机理。

更新日期:2020-07-27
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