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Investigation on microstructure and properties of laser cladded AlCoCrCuFeNi high entropy alloy coating by ultrasonic impact treatment
Intermetallics ( IF 4.4 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.intermet.2020.107017
Shiyi Zhang , Bin Han , Meiyan Li , Chunyang Hu , Qi Zhang , Xiaofei Liu , Yong Wang

Abstract The application of high entropy alloy (HEA) as coating materials has become a research hotspot. The combination of laser cladding technology and ultrasonic impact treatment (UIT) may provide an opportunity for better performance of HEA and it is possible to enhance the application prospect of HEA. To research the effects of UIT on microstructure and properties of laser cladded HEA coating, AlCoCrCuFeNi HEA coating was prepared by means of laser cladding and UIT was applied to strengthen the surface properties of AlCoCrCuFeNi HEA coating. The phase structures of laser cladded AlCoCrCuFeNi HEA coating were composed of FCC and BCC phases. There were no new phases formed in the AlCoCrCuFeNi HEA coating after UIT, while the BCC phase volume fraction was increased. Additionally, a hardening layer with a depth of ~15 μm was formed at the top surface and the average values of grain sizes were refined from 34.4 μm to 18.6 μm. As expected, the hardness of AlCoCrCuFeNi HEA coating with UIT was significantly improved to 715 HV0.2 benefitted from the nano crystal structure and enhanced plastic deformation and then decreases gradually along the depth to approximately the same hardness value as that of without UIT (530 HV0.2). More impressively, the impact hardening AlCoCrCuFeNi HEA coating exhibited higher corrosion resistance in 3.5% NaCl solution resulting from the lower surface roughness and fewer microstructure defects.

中文翻译:

超声冲击处理激光熔覆AlCoCrCuFeNi高熵合金涂层的组织和性能研究

摘要 高熵合金(HEA)作为涂层材料的应用已成为研究热点。激光熔覆技术与超声冲击处理(UIT)的结合可能为HEA的更好性能提供机会,并有可能提升HEA的应用前景。为研究UIT对激光熔覆HEA涂层组织和性能的影响,采用激光熔覆制备AlCoCrCuFeNi HEA涂层,并应用UIT强化AlCoCrCuFeNi HEA涂层的表面性能。激光熔覆AlCoCrCuFeNi HEA涂层的相结构由FCC和BCC相组成。UIT后AlCoCrCuFeNi HEA涂层中没有新相形成,而BCC相体积分数增加。此外,在顶面形成了深度约为 15 μm 的硬化层,晶粒尺寸的平均值从 34.4 μm 细化到 18.6 μm。正如预期的那样,受益于纳米晶体结构和增强的塑性变形,带有 UIT 的 AlCoCrCuFeNi HEA 涂层的硬度显着提高至 715 HV0.2,然后沿深度逐渐减小,硬度值与没有 UIT 的硬度值(530 HV0 .2)。更令人印象深刻的是,由于较低的表面粗糙度和较少的微观结构缺陷,冲击硬化 AlCoCrCuFeNi HEA 涂层在 3.5% NaCl 溶液中表现出更高的耐腐蚀性。2受益于纳米晶体结构和增强的塑性变形,然后沿深度逐渐减小到与没有UIT的硬度值(530 HV0.2)大致相同的硬度值。更令人印象深刻的是,由于较低的表面粗糙度和较少的微观结构缺陷,冲击硬化 AlCoCrCuFeNi HEA 涂层在 3.5% NaCl 溶液中表现出更高的耐腐蚀性。2受益于纳米晶体结构和增强的塑性变形,然后沿深度逐渐减小到与没有UIT的硬度值(530 HV0.2)大致相同的硬度值。更令人印象深刻的是,由于较低的表面粗糙度和较少的微观结构缺陷,冲击硬化 AlCoCrCuFeNi HEA 涂层在 3.5% NaCl 溶液中表现出更高的耐腐蚀性。
更新日期:2021-01-01
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