首页|时效处理对激光熔覆Mo0.5NbTiVCr0.25高熵合金涂层显微组织和耐磨性能的影响

时效处理对激光熔覆Mo0.5NbTiVCr0.25高熵合金涂层显微组织和耐磨性能的影响

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通过激光熔覆技术在TC4基体上制备难熔Mo0.5NbTiVCr0.25高熵合金涂层.涂层在600、800和1000 ℃下时效热处理24 h,然后水冷.采用X射线衍射(XRD)、扫描电子显微镜(SEM)、电子背散射衍射(EBSD)、透射电子显微镜(TEM)等技术、以及维氏硬度和万能摩擦磨损测试手段对高熵合金涂层的相组成、显微组织和力学性能进行研究.结果表明,高熵合金涂层经不同时效热处理后仍保持体心立方结构.经800℃时效热处理后,涂层含有富Ti沉淀相,通过TEM术证实其为Ti(O,N)面心立方结构.最佳时效温度为600 ℃,涂层硬度为HV0.2410.该涂层的磨损机制为黏着磨损和磨料磨损.
Effects of aging on micro structure and wear resistance of laser cladding Mo0.5NbTiVCr0.25 high-entropy alloy coating
Refractory Mo0.5NbTiVCr0.25 high-entropy alloy coatings were fabricated on TC4 substrates using laser cladding technology.The coatings were aged at 600,800 and 1000 ℃ for 24 h and then water-cooled.The phase composition,microstructure,and mechanical properties of the high-entropy alloy coatings were investigated using X-ray diffraction(XRD),scanning electron microscopy(SEM),electron backscattered diffraction(EBSD),transmission electron microscopy(TEM),Vickers hardness testing and universal friction wear testing.The results showed that high-entropy alloy coatings retained a body-centered cubic structure after different aging heat treatments.After the aging heat treatment at 800 ℃,the coatings exhibited Ti-rich precipitation phases,which were verified as Ti(O,N)face-centered cubic structures by TEM technique.The optimum aging temperature was 600 ℃ and the hardness of the coating was HV0.2 410.The wear mechanisms of the coatings were adhesive and abrasive wear.

Mo0.5NbTiVCr0.25 alloylaser claddingrefractory high-entropy alloymicrostructureagingwear

何吉、付华萌、刘翠容、朱正旺、张龙、李正坤、李宏、张海峰

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中国科学院金属研究所核材料与安全评价重点实验室,沈阳 110016

太原科技大学材料科学与工程学院,太原 030024

中国科学院金属研究所师昌绪先进材料创新中心,沈阳 110016

Mo0.5NbTiVCr0.25合金 激光熔覆 难熔高熵合金 显微组织 时效 磨损

National Key Research and Development ProgramChinese Academy of Sciences of ChinaLing-Chuang Research Project of the China National Nuclear Corporation

2021YFA0716303ZDBS-LY-JSC023

2024

10.1016/S1003-6326(24)66536-2

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(7)