Microstructure and tribological properties of laser clad Ti2Ni3Si/NiTi intermetallic coatings
Microstructure and tribological properties of laser clad Ti2Ni3Si/NiTi intermetallic coatings
复制标题
激光熔覆Ti2Ni3Si/NiTi金属间涂层的显微组织和摩擦学性能
DOI：
10.1016/s1359-6454(03)00465-8
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发表时间：
2003-12-08
期刊：
影响因子：
9.4
通讯作者：
Zhang, LY
中科院分区：
文献类型：
--
作者：
Wang, HM;Cao, F;Zhang, LY
以Ti-Ni-Si合金粉末为前驱体，采用激光熔覆工艺在0.2%C低碳钢基体上制备了由三元金属硅化物Ti 2Ni 3Si初生枝晶和枝晶间Ti 2Ni 3Si/NiTi共晶组成的Ti 2Ni 3Si/NiTi全金属间化合物耐磨复合涂层。采用光学显微镜（OM）、扫描电镜（SEM）、X射线衍射仪（XRD）和能谱仪（EDS）对涂层的微观结构进行了表征。在室温干滑动磨损试验条件下，研究了激光熔覆Ti 2Ni 3Si/NiTi金属间化合物涂层的耐磨性。结果表明，Ti 2Ni 3Si/NiTi金属间化合物涂层在干滑动磨损条件下具有优异的耐磨性和抗粘着磨损性能，这是由于金属间化合物NiTi的高屈服强度和韧性与三元金属硅化物Ti 2Ni 3Si的高硬度、强共价键和可能的强硬度异常的独特结合。(C)2003 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Wear resistant Ti2Ni3Si/NiTi full intermetallic composite coatings with a microstructure consisting of ternary metal silicide Ti2Ni3Si primary dendrites and interdendritic Ti2Ni3Si/NiTi eutectic were fabricated on a substrate of 0.2%C low carbon steel by the laser cladding process using Ti-Ni-Si alloy powders as the precursor materials. Microstructure of the coatings was characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDS). Wear resistance of the laser clad Ti2Ni3Si/NiTi intermetallic coatings was evaluated under dry sliding wear test conditions at room temperature. Results indicate that the Ti2Ni3Si/NiTi intermetallic coatings have excellent abrasive and adhesive wear resistance under dry sliding wear test conditions because of the unique combination of high yield strength and toughness of the intermetallic compound NiTi and the high hardness, strong covalent dominant atomic bonds and possible strong hardness anomaly of the ternary metal silicide Ti2Ni3Si with MgZn2 type Laves crystal structure. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.