摘要：钛基复合材料是指在钛或钛合金中加入增强相的一种复合材料，具有高于钛合金的强度、优异的蠕变性、良好的耐蚀性和高温性能。但是钛基复合材料也有缺陷，比如钛合金基体和陶瓷增强体之间弹性模量相差较大，导致材料性质不连续，容易产生微裂纹，应力集中等一系列问题。

本文主要是关于钛基复合材料相界控制的研究。通过化学镀的方法在5vol.%(TiC+TiB)/Ti-6Al-4V试样表面获得镀镍层，分别研究镀液温度、镀液PH值、活化时间以及试样表面粗糙度对镀层的影响，通过高温预扩散热处理研究镍钛之间的扩散机理，再对其进行不同温度的热处理。利用扫描电镜观察其表面形貌，透射电镜观察其组织结构，通过拉伸试验测试其力学性能，并测定不同组织的硬度、耐磨性和耐蚀性等，从而更好地对钛基复合材料相界进行研究。

研究结果表明：化学镀镍过程中，当镀液温度为85℃，镀液PH值为8，活化时间为20s，粗糙度越小，此时化学镀镍的效果最好；试样化学镀镍后在热处理扩散过程中会生成多种镍钛的化合物，包括NiTi、Ni3Ti和Ti2Ni；镍原子的扩散方式基本上是沿着相界扩散的；随着温度的升高，镍原子扩散的过程中会产生新的镍钛相，先出现Ti2Ni和Ni3Ti，后出现NiTi；预扩散处理过程使试样硬度有所提升；随着温度的升高，试样整体的硬度基本上是先下降后上升的趋势；镀镍层的硬度基本上高于镍钛的化合物层和基体的硬度；镀镍试样耐磨性较好，热处理后的镀镍试样耐磨性稍有降低；原基体的耐蚀性能不如镀镍后扩散处理的试样，热处理后的镀镍试样的耐蚀性能略低于镀镍后扩散处理的试样。

关键字：钛基复合材料；界面；组织；性能

Abstract：Titanium matrix composite is a composite material that reinforcement is added in titanium or titanium alloy, with higher strength, excellent creep resistance, good corrosion resistance and high temperature performance. However, titanium matrix composite also has defects. For example, a large difference of the elastic modulus between titanium alloy matrix and ceramic reinforence makes the material properties discontinuous, prone to micro-cracks, stress concentration and other problems.

Phase Boundary Control of Titanium Matrix Composites was studied in this paper. This article intends to obtain nickel plating on 5vol.% (TiC+TiB) /Ti-6Al-4V samples by chemical plating method, study the effects of temperature, pH, activation time and surface roughness on the coating ,study the diffusion mechanism between Ni and Ti by high temperature diffusion heat treatment and then these samples were subjected to heat treatment in different temperature. Through the heat treatment, the surface morphology was observed by scanning electron microscopy,  the microstructure was observed by transmission electron microscopy, the mechanical properties were tested by tensile test, and evaluate the hardness of different tisues, wear resistance and corrosion resistance to study more about the interface of titanium-based composite materials.

The results show that the best results are achieved when the temperature is  85℃,pH value is 8, the activation time is 20s, the smaller the roughness,the best the electroless nickel plating in the electroless nickel plating process .After electroless nickel plating in the heat treatment the samples will produce a variety of NiTi compounds,including NiTi,Ni3Ti and Ti2Ni. The diffusion of nickel atoms diffuse along the boundary essentially. With the increasing of temperature, it will produce new nickel-titanium phase in the process of diffusion of nickel atoms, first appeared Ti2Ni,after the emergence of NiTi and Ni3Ti. The pre-diffusion process improves the hardness of the sample. With the increasing of the temperature, the hardness of these samples firstly decline ,then ascends basically. The hardness of the nickel layer is higher than that of the NiTi layer and the hardness of the matrix. The wear   resistance of nickel-plated samples is better and the wear resistance of nickel-plated samples after heat treatment is slightly lower. The corrosion resistance of the nickel-plated sample is better than that of the original matrix, and the corrosion resistance of the nickel-plated sample after heat treatment is slightly lower than that of  the nickel-plated sample.