时效对激光重熔Mo_(0.5)NbTiVCr_(0.25)高熵合金涂层组织及性能的影响  

Effects of Aging on Microstructure and Properties of Laser Remelted Layer of Mo_(0.5)NbTiVCr_(0.25) High Entropy Alloys

作　　者：何吉 刘翠荣[1] 付华萌[2,3] 李松涛 朱正旺[2,3] 张龙[2,3] 李正坤[2,3] 李宏[2,3] HE Ji;LIU Cuirong;FU Huameng;LI Songtao;ZHU Zhengwang;ZHAGN Long;LI Zhengkun;LI Hong(School of Materials Science and Technology,Taiyuan University of Science and Technology,Taiyuan 030024,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]中国科学院金属研究所师昌旭先进材料创新中心,辽宁沈阳110016 [3]中国科学院金属研究所中国科学院核用材料与安全评价重点实验室,辽宁沈阳110016

出　　处：《热加工工艺》2025年第3期65-70,共6页Hot Working Technology

基　　金：中国科学院重点部署项目(ZDRW-CN-2021-2-3);国家重点研发计划项目(2021YFA0716303)。

摘　　要：研究了不同温度时效热处理对激光重熔Mo_(0.5)NbTiVCr_(0.25)高熵合金涂层微观组织和维氏硬度的影响。利用X射线衍射仪(XRD)、扫描电镜(SEM)、电子背散射衍射仪(EBSD)和维氏硬度机对重熔涂层和重熔热处理涂层进行微观组织和显微硬度测试。结果表明:重熔涂层经时效热处理后微观组织的变化不明显,仍以枝晶结构为主。该重熔涂层经时效热处理后晶粒的尺寸有所增加,在时效800℃及以上的温度,有含Ti析出相。经时效热处理后,涂层的硬度整体随温度升高呈下降趋势。The effects of aging at different temperatures on the microstructure and Vickers hardness of laser remelted Mo_(0.5)NbTiVCr_(0.25) high-entropy alloy coatings were investigated.The microstructure and microhardness of the remelted coatings and remelting heat-treated coatings were tested using X-ray diffraction(XRD),scanning electron microscopy(SEM),electron backscatter diffraction(EBSD)and Vickers hardness machine.The results show that the changes of microstructure of remelted coatings after aging heat treatment are not obvious and still dominated by dendritic structure.The size of the grains of the remelted coating increases after the aging treatment,and there is Ti-containing precipitation phase at the aging temperature of 800℃and above.The hardness of the coatings shows an overall decreasing trend with the increase of the temperature after the aging heat treatment.

关 键 词：激光重熔 高熵合金 时效 显微组织 硬度 

分 类 号：TG156.92[金属学及工艺—热处理]