热处理对真空热压烧结NiCrCoTiV高熵合金组织结构及耐腐蚀性能的影响  

Effect of Heat Treatment on Microstructure and Corrosion Resistance of NiCrCoTiV High-entropy Alloy Prepared by Vacuum Hot-pressing Sintering

作　　者：温鑫[1] 金国[1] 庞学佳[2] 蔡召兵 张子晗 崔秀芳[1] 王海斗[1,3] 徐滨士[3] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,腐蚀科学与表面技术研究所,哈尔滨150001 [2]中国船舶重工集团公司703研究所,哈尔滨150078 [3]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072

出　　处：《材料导报》2017年第12期79-83,共5页Materials Reports

基　　金：国家自然科学基金(51575118;51375106);中央高校基金重大培育计划(HEUCFP-2016154)

摘　　要：采用真空热压烧结技术制备了NiCrCoTiV高熵合金,并分别在500℃、600℃和700℃下对高熵合金进行18h保温热处理。采用X射线衍射仪、扫描电子显微镜、电化学测试系统研究了不同热处理温度对高熵合金物相结构、微观组织及耐腐蚀性能的影响。结果表明,高熵合金的物相组成在不同温度热处理后均未发生明显改变,表现出良好的热稳定性。热处理后,高熵合金晶粒细化,析出相减少;热处理温度越高,晶粒细化效果越好。相比于未热处理的试样,热处理后试样的耐腐蚀性能明显提高,并且随热处理温度升高,耐腐蚀性能呈上升趋势。The NiCrCoTiV high-entropy alloy was prepared by vacuum hot-pressing sintering and heated at 500 ℃, 600 ℃ and 700 ℃ for 18 h, respectively. The effects of different heat-treatments on the phase, microstructure ana corroslon-reslsnng oi me NiCrCoTiV high-entropy alloy were studied in detail by X-ray diffraction, scanning electron microscopy and electrochemical worksta- tion. The experiment results show that after different heat-treatment, the phase of high-entropy alloy did not change significantly, showing excellent high temperature stability. After heat-treatment, the grains of high-entropy alloy are refined and the precipitation phase is reduced. With the increase of heat-treatment temperature, the grain size gradually decreases. After heat-treatment, the cor- rosion resistance of high-entropy alloy gets a great increase. In addition, the corrosion resistance of the high-entropy alloy increases with the heat-treatment temperature rises.

关 键 词：高熵合金 热处理 微观组织 耐蚀性 

分 类 号：TG174.2[金属学及工艺—金属表面处理]