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李明川,张培磊,于治水,闫华,叶欣,李绍伟.激光熔覆Ni-Ti-Si合金组织及微观力学性能研究[J].稀有金属材料与工程(英文),2019,48(4):1225~1230.[Li Mingchuan,Zhang Peilei,Yu Zhishui,Yan Hua,Ye Xin and Li Shaowei.Microstructure and micromechanics features of Ni-Ti-Si coating deposited by laser cladding[J].Rare Metal Materials and Engineering,2019,48(4):1225~1230.]
Microstructure and micromechanics features of Ni-Ti-Si coating deposited by laser cladding
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Received:September 23, 2017  Revised:November 06, 2017
Key words: laser cladding  Ni-based alloy  surface modification of Cu  rapid solidification
Foundation item:国家自然科学基金(51375294, 51605276, 51405288),上海汽车工业科技发展基金会(1604),上海市“创新行动计划”基础研究领域项目(17JC1400600,17JC1400601)
Author NameAffiliation
Li Mingchuan,Zhang Peilei,Yu Zhishui,Yan Hua,Ye Xin and Li Shaowei  
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      A cladding layer 55Ni-35Ti-10Si (at.%) was synthesized on copper using laser cladding in this paper. It was composed of two kinds of microstructures. The microstructures of the cladding layer were characterized by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). According to the analysis results, phases appeared in upper layer should be Ti solid solution+Ni3Si and the morphology was dendritic. The under layer was composed of Ti solid solution+ Cu solid solution and the morphology was cellulate. The crystal growth in solidification process was analysed using a modification model which is combined Kurz-Giovanola-Trivedi (KGT) model with Lipton-Kurz-Trivedi (LKT) model. Mechanism of cladding layer stratification was studied by thermodynamics. Microhardness of cladding layer was tested. The average hardness of upper layer and under layer were 800HV and 220HV, respectively. The synthesis of under layer increased the stability of cladding layer.