退火温度对包套挤压FeCoCrNiMo<sub>0.1</sub>高熵合金组织与摩擦性能的影响

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摘要以气雾化FeCoCrNiMo_0.1高熵合金粉末为原料,采用包套挤压法制备成高熵合金棒材,然后对挤压棒材分别在350,500,650 ℃下退火4 h,通过扫描电镜和XRD观察与分析合金的微观组织和物相组成,并测定合金的硬度和耐磨性能。结果表明：气雾化FeCoCrNiMo_0.1合金粉末的球形度较高,挤压态及退火态合金均为单相FCC结构,不同温度下退火的合金硬度相差不大,微观组织的变化主要体现在晶粒大小以及孪晶的种类和数量。与挤压态合金相比,350 ℃退火后,变形孪晶数量减少,合金的耐磨性和屈服强度略有下降,摩擦界面出现颗粒粘附,合金的摩擦因数降低。随退火温度升高,孪晶数量增加,合金的耐磨性和屈服强度提高,磨损机理以黏着磨损为主,摩擦因数增大。

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	田彦文
	任俊业
	黄千里
	李清湘
	周少强
	刘银
	吴宏

关键词 ：高熵合金, 气雾化粉末, 退火, 屈服强度, 摩擦磨损

Abstract：A high-entropy alloy bar was prepared by canned extruding using gas-atomization FeCoNiMo_0.1 as raw materials. The extruded bar was annealed at 350, 500 and 650 ℃ for 4 h, respectively. The microstructure and phase composition of the samples were analyzed using scanning electron microscopy (SEM) and X-Ray diffraction (XRD). In addition, the hardness and abrasive resistance of the samples were also tested. The results show that the gas-atomized FeCoCrNiMo_0.1powder has a high sphericity, the extruded and annealed samples are single-phase FCC structure, the hardness of the samples annealed at different temperatures have no obvious change. The change of microstructure is mainly reflected in the grain size and the type and number of the twins. After annealing at 350 ℃, the number of deformation twins decreases, the wear resistance and compression pressure of the alloy decrease slightly, the grain adhesion appeares at the friction interface and the friction coefficient of the alloy decreases. After annealing at 500 ℃ and 650 ℃, the number of twins increases, the wear resistance and yield strength of the alloy increase, the wear mechanism is mainly adhesive wear, and the friction coefficient increases.

Key words： high-entropy alloy gas atomization powder annealing compression yield friction and wear

收稿日期: 2018-02-28 出版日期: 2019-07-12

ZTFLH:

TG156.2

基金资助:国家重点研发计划资助项目(2016YFB1100103); 湖南省重点研发计划资助项目(2016JC2003); 中南大学创新驱动计划资助项目(2016CX003)

通讯作者: 吴宏,副教授,博士。电话：0731-88877669;E-mail: wuhong927@126.com

引用本文:

田彦文, 任俊业, 黄千里, 李清湘, 周少强, 刘银, 吴宏. 退火温度对包套挤压FeCoCrNiMo_0.1高熵合金组织与摩擦性能的影响[J]. 粉末冶金材料科学与工程, 2018, 23(5): 482-487.
TIAN Yanwen, REN Junye, HUANG Qianli, LI Qingxiang, ZHOU Shaoqiang, LIU Yin, WU Hong. Effects of annealing temperature on the microstructure and friction properties of FeCoCrNiMo_0.1 high-entropy alloy fabricated by canned extruding. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 482-487.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2018/V23/I5/482

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