首页|热处理过程TiAlCrMn高熵合金的高温氧化特性与力学性能

热处理过程TiAlCrMn高熵合金的高温氧化特性与力学性能

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采用真空熔炼制备不同Al、Cr、Mn含量的TiAlCrMn系高熵合金,并对其高温氧化特性和热处理前后的力学性能进行研究.结果表明,随着Al、Cr、Mn含量的增加,其高温氧化质量增加率明显降低,这是因为在氧化层中形成了连续且致密的富(Al,Cr)氧化物,阻碍氧原子与其他合金原子相互扩散形成新的氧化物.另外,热处理前后的样品,其显微硬度均存在单调递增的趋势,晶粒粗化会导致样品硬度降低,而在高含量合金元素的样品中,析出强化会改善其硬度.变形诱导强化使材料获得更高的压缩强度,在500 ℃热处理后的样品其屈服强度有所降低,而经过900 ℃热处理的材料屈服强度得到提升,但其延展性降低.
High-temperature oxidation behaviors and mechanical properties of TiAlCrMn HEAs during heat treatment
A series of TiAlCrMn high entropy alloys(HEAs)with variable atomic ratios of Al,Cr,and Mn were prepared using vacuum melting.High-temperature oxidation behaviors and mechanical properties were investigated before and after heat treatment.The oxidation mass gain rate is declined dramatically with increasing Al,Cr,and Mn element contents.Enhanced oxidation resistance is attributed to a continuously dense(Al,Cr)-rich oxidation layer,which can hinder the inter-diffusion of O and alloying elements.Furthermore,microhardness increases monotonously with increasing Al,Cr,and Mn element contents of the alloys before and after heat treatment.Grain coarsening can result in lower microhardness,but precipitation strengthening contributes to higher hardness of the alloys with high alloying element contents.Meanwhile,deformation-induced strengthening also contributes to higher compressive strength.The value after heat treatment at 500 ℃ is lower than that of as-cast samples while an increased value occurs after heat treatment at 900 ℃ accompanied by sacrificing the malleability.

high entropy alloys(HEAs)oxidation resistancemicrostructural evolutionmicrohardnesscompressive strength

陈平虎、李柏春、刘震、周英豪、李瑞卿、张昀

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深圳大学机电与控制工程学院增材制造所,深圳 518060

哈尔滨工业大学(深圳)材料科学与工程学院,深圳 518055

香港城市大学机械工程学院,香港

中南大学轻合金研究院高性能复杂制造国家重点实验室,长沙 410083

湖南科技大学机电工程学院,湘潭 411201

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高熵合金(HEAs) 抗氧化性 显微组织演变 显微硬度 压缩强度

Open Research Fund of State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University,CHunan Provincial Natural Science Foundation,ChinaProject of State Key Laboratory of High Performance Complex Manufacturing,Central South University,China

Kfkt2020-012021JJ40774ZZYJKT2021-01

2024

10.1016/S1003-6326(23)66392-7

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(1)
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