<strong>CoCuFeNiTi</strong>高熵合金涂层的制备和性能研究

doi:10.11901/1005.3093.2020.541

材料研究学报

2021, Vol. 35

Issue (8): 561-571 DOI: 10.11901/1005.3093.2020.541

研究论文

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CoCuFeNiTi高熵合金涂层的制备和性能研究

王根, 李新梅(

), 卢彩彬, 王松臣, 柴程

新疆大学机械工程学院乌鲁木齐 830047

Preparation and Properties of CoCuFeNiTi High Entropy Alloy Coating

WANG Gen, LI Xinmei(

), LU Caibin, WANG Songchen, CHAI Cheng

College of Mechanical Engineering, Xinjiang University, Urumqi 830047, China

引用本文:

王根, 李新梅, 卢彩彬, 王松臣, 柴程. CoCuFeNiTi高熵合金涂层的制备和性能研究[J]. 材料研究学报, 2021, 35(8): 561-571.
Gen WANG, Xinmei LI, Caibin LU, Songchen WANG, Cheng CHAI. Preparation and Properties of CoCuFeNiTi High Entropy Alloy Coating[J]. Chinese Journal of Materials Research, 2021, 35(8): 561-571.

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摘要:

采用激光熔覆技术在40 Cr钢基材表面制备CoCuFeNiTi高熵合金涂层，使用SEM、XRD和EDS等手段分析涂层的显微组织和相组成，研究了涂层的制备工艺、显微硬度、耐磨损和耐腐蚀性能。结果表明：在激光功率为700 W、扫描速度为6 mm/s条件下制备的CoCuFeNiTi高熵合金涂层表面质量较好，涂层与基体之间形成了良好的冶金结合；这种涂层由FCC相、少量的Cu₄Ti相和微纳级富Cu析出相构成，具有典型的树枝晶显微组织，Cu元素在枝晶间偏聚并形成微纳级富Cu析出相；涂层的显微硬度约为438.83HV，是基体的1.7倍；涂层的磨损质量损失约为基体的1/2，表明这种涂层具有更高的耐磨损性能。涂层的磨损，以黏着磨损为主伴有一定程度的磨粒磨损；这种涂层在pH=4的酸性溶液和3.5%NaCl溶液中的耐蚀性均优于基体。

关键词 ：金属材料, 高熵合金, 电化学腐蚀, 磨损

Abstract：

The CoCuFeNiTi high entropy alloy coating was prepared by laser cladding technology on the surface of 40 Cr steel, which then was characterized by means of SEM, XRD and EDS, as well as microhardness tester, wear resistance and corrosion resistance test. The results show that among others the coating prepared by laser beam with power of 700 W and scanning speed of 6 mm/s presents the best in surface quality and metallurgical bonding between the coating and the substrate. The coating is mainly composed of FCC phase, a small amount of Cu₄Ti phase and nano precipitates rich in Cu. The microstructure of the coating shows typical dendrite structure, while Cu segregated in between dendrites as micro- and/or nano-particulates rich in Cu. The microhardness of the coating is 438.83HV, which is 1.7 times that of 40 Cr steel. The wear mass loss of the coating is about 1/2 that of 40 Cr steel, indicating the coating has better wear resistance. The wear of the coating is mainly adhesive wear, accompanied by a certain degree of abrasive grain wear. The corrosion resistance of the coating in acidic medium of pH=4 and 3.5%NaCl solution was better than that of 40 Cr steel.

Key words： metallic materials high entropy alloy electrochemical corrosion wear

收稿日期: 2020-12-21

ZTFLH:

TL214+.6

基金资助:国家自然科学基金(51865055);新疆自治区天山英才计划(201720025);新疆自治区研究生创新项目(XJ2020G051)

作者简介: 王根，男，1996年生，硕士生

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表1 激光功率单因素试验表

表2 扫描速度单因素试验表

图1 激光功率不同的单道涂层

图2 不同激光功率涂层的截面形貌

图3 激光扫描速度不同的单道涂层

图4 不同激光扫描速度涂层的截面形貌

图5 预置层粉末和CoCuFeNiTi高熵合金涂层的XRD谱

图6 CoCuFeNiTi高熵合金涂层的显微组织

图7 CoCuFeNiTi高熵合金涂层中各元素的分布

表3 各元素之间的混合焓(kJ·mol-1)[23]

图8 CoCuFeNiTi高熵合金涂层显微硬度的分布

图9 热影响区的显微组织

图10 CoCuFeNiTi高熵合金涂层和基体的磨损质量损失

图11 CoCuFeNiTi高熵合金涂层的磨损形貌

图12 CoCuFeNiTi高熵合金涂层和基体在不同腐蚀溶液中的极化曲线

表4 基体和CoCuFeNiTi高熵合金涂层在不同腐蚀介质中的Ecorr，Icorr，Ep和Ipass

图13 CoCuFeNiTi高熵合金涂层和基体在pH=4酸性溶液中的腐蚀形貌

图14 CoCuFeNiTi高熵合金涂层和基体在3.5%NaCl溶液中的腐蚀形貌

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