目的 通过原位合成技术获得TiB2-Ni(Al)复合粉末。方法 采用机械合金化方法在不同球磨时间的条件下，制备不同体积含量的TiB2陶瓷相增强Ni(Al)基复合粉末，其中Ni粉和Al粉的摩尔比为1:1。采用扫描电子显微镜（SEM）以及 X-射线衍射仪（XRD）分析球磨后粉末的显微组织结构及物相，研究不同球磨时间对制备TiB2-Ni(Al)复合粉末物相演变、组织结构及粒子间界面结合状态的影响。结果 在球磨过程中，球磨时间越长，Ni/Al间的塑变有利于原子之间的扩散，TiB2陶瓷相颗粒逐渐变小。当球磨时间增长到一定程度时，延展性好的Al粉颗粒发生扁平化且其表面积不断增大，使得碎化后的Ni粉颗粒不断嵌入Al粉颗粒中，最终形成 Ni(Al)固溶体。同时根据XRD分析发现，随着球磨时间的延长，TiB2-Ni(Al)复合粉末中的Al峰逐渐减小，说明Al不断固溶到Ni中，形成了一定量的Ni(Al)固溶体。结论 通过机械球磨技术在球磨一定时间后可原位合成Ni(Al)固溶体，这说明随着Ni与Al之间的相互扩散有利于形成Ni(Al)固溶体。

The work aims to obtain TiB2-Ni(Al) composite powder through in-situ synthetic technology. Ni(Al)-based composite powder reinforced by TiB2 ceramic phase with different volume contents was prepared by mechanical alloying method under different ball milling time. The molar ratio of Ni and Al was 1:1. The microstructure and phase of ball-milled powder were analyzed with scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively. The influence of various ball milling time on the phase evolution of TiB2-Ni(Al) composite powder prepared, microstructure and interfacial bonding between particles was studied. In the process of ball milling, with the milling time prolonging, the plastic deformation between Ni/Al was conducive to atom diffusion and the size of TiB2 ceramic phase particle became smaller and smaller. When the ball milling time increased to a certain extent, the Al powder particles of good ductility would be flattened and its surface area became larger. In such case, the broken Ni powder particles were embedded into Al powder particles to finally form Ni(Al) solid solution. Meanwhile, according to the analysis of XRD, with the ball milling prolonging, Al peak in TiB2-Ni(Al) composite powder was gradually decreased, which revealed that Al constantly diffused into Ni to form a certain amount of Ni(Al) solid solution. Ni(Al) solid solution can be successfully in-situ synthesized by mechanical ball milling technology after a certain milling time, so it is revealed that the inter-diffusion between Ni and Al is in favor of forming Ni(Al) solid solution.