Effect of Heat Treatment on Microstructure and Corrosion Resistance of NiCrCoTiV High-entropy Alloy Prepared by Vacuum Hot-pressing Sintering
WEN Xin1, JIN Guo1, PANG Xuejia2, CAI Zhaobing1, ZHANG Zihan1, CUI Xiufang1, WANG Haidou1,3, XU Binshi3
1 Institute of Corrosion Science and Surface Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001; 2 The 703 Research Institute of China Shipbuilding Industry Corporation, Harbin 150078; 3 National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072
Abstract: 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 and corrosion-resisting of the NiCrCoTiV high-entropy alloy were studied in detail by X-ray diffraction, scanning electron microscopy and electrochemical workstation. 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 corrosion 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.
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2017, Vol. 31 
