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,2019,48(4):1225~1230.[Li Mingchuan,Zhang Peilei,Yu Zhishui,Yan Hua,Ye Xin,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.]
激光熔覆Ni-Ti-Si合金组织及微观力学性能研究
投稿时间:2017-09-23  修订日期:2017-11-06
中文关键词:  激光熔覆  镍基合金  铜表面改性  快速凝固
基金项目: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)
中文摘要:
      采用激光熔覆技术在铜表面制备了55Ni-35Ti-10Si (at.%)合金熔覆层,熔覆层呈现上、下两层。利用光学显微镜(OM)、扫描电子显微镜(SEM)、X 射线衍射仪(XRD)、能谱仪(EDS)分析上层组织为树枝晶,组成相为初生钛固溶体+枝晶间Ni3Si;下层组织为胞状晶,组成相为初生钛固溶体+枝晶间铜固溶体,胞状晶区高度约为200μm。利用KGT和LKT改进模型计算得出熔覆层熔池凝固过程枝晶尖端过冷度-凝固速度曲线,从热力学角度分析熔覆层出现分层的机理。对熔覆层进行显微硬度试验,得到上层树枝晶区域和下层胞状晶区域平均硬度分别为800HV和220HV。提出下层胞状晶区域的存在有利于熔覆层与基体间性能过渡,提高了熔覆层稳定性。
Microstructure and micromechanics features of Ni-Ti-Si coating deposited by laser cladding
英文关键词:laser cladding  Ni-based alloy  surface modification of Cu  rapid solidification
英文摘要:
      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.
作者单位E-mail
李明川 上海工程技术大学材料工程学院 15317538065@163.com 
张培磊 上海工程技术大学材料工程学院 oxidpl@126.com 
于治水 上海工程技术大学材料工程学院  
闫华 上海工程技术大学材料工程学院  
叶欣 上海工程技术大学材料工程学院  
李绍伟 上海工程技术大学材料工程学院  
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