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激光增材制造AlMoxNbTayTiZr难熔高熵合金的高温抗氧化性能OA北大核心CSTPCD

High temperature oxidation resistance of AlMoxNbTayTiZr refractory high entropy alloys fabricated by laser additive manufacturing

中文摘要英文摘要

难熔高熵合金具有优异的高温力学性能,但高温抗氧化能力一直是其应用的限制因素之一.利用激光增材制造技术设计并制备AlNbTaTiZr,AlMoNbTiZr,AlMoNbTaTiZr和AlMo0.5NbTa0.5TiZr四种难熔高熵合金,测试其在900℃和1000℃两种温度下的氧化增重情况并研究不同试样的氧化层结构,对比分析Mo,Ta两种元素对AlNbTiZr基难熔高熵合金高温抗氧化性能的影响.结果表明:激光增材制造制备的四种高熵合金沉积态均为BCC+HCP双相结构,枝晶干以高熔点BCC相为主,少量富含Al,Zr元素的HCP相分布在枝晶间;四种高熵合金在 900℃与 1000℃长时间氧化时AlNbTaTiZr表现出最佳的抗氧化性,以Ta替代Mo在一定程度上提升了难熔高熵合金的抗氧化性能.

Refractory high entropy alloys have excellent high temperature mechanical properties,but the high temperature oxidation resistance has always been one of the limiting factors in their application.Four kinds of refractory high entropy alloys AlNbTaTiZr,AlMoNbTiZr,AlMoNbTaTiZr and AlMo0.5NbTa0.5TiZr were designed and prepared by laser additive manufacturing technology.The oxidation mass gain of AlNbTiZr-based refractory high entropy alloys was measured at 900℃and 1000℃,and the oxidation layer structure of different samples was studied.The effects of Mo and Ta on the high temperature oxidation resistance of AlNbTiZr-based refractory high entropy alloys were compared and analyzed.The results show that the four kinds of as-deposited high entropy alloys prepared by laser additive manufacturing are BCC+HCP dual-phase structures.The dendrites are mainly BCC phases with high melting points,and a small amount of HCP phase rich in Al and Zr is distributed among the dendrites.AlNbTaTiZr shows the best oxidation resistance after oxidation at 900℃and 1000℃for a long time,and Ta instead of Mo to some extent improves the oxidation resistance of refractory high entropy alloys.

张智博;李卓;苏冰;申春杰;任鹏吉

北京航空航天大学 大型金属构件增材制造国家工程实验室,北京 100191

金属材料

难熔高熵合金激光增材制造微观组织高温氧化

refractory high entropy alloylaser additive manufacturingmicrostructurehigh temperature oxidation

《材料工程》 2024 (007)

33-43 / 11

国家重点研发计划项目(2023YFB4603300);国家科技重大专项(Y2019-Ⅶ-0011-0151)

10.11868/j.issn.1001-4381.2024.000006

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