利用原位合成的思路制备Ti-Ti3Al金属复合材料是提高钛基复合材料性能的好方法。通过选区激光熔化（SLM)技术和原位合成技术对不同混合比例的Ti-AlSi10Mg复合粉末进行成形试验,研究Al含量对SLM制备原位自生Ti-Ti3Al金属复合材料显微组织和力学性能的影响,并分析其物相、显微组织、显微硬度、耐磨性和拉伸压缩性能。试验结果表明：Al元素在成形过程中进入了Ti晶体中,形成了Ti-Al置换固溶体,对样件进行固溶强化,且会析出Ti3Al增强相颗粒。随着Al含量的增加,样件的力学性能逐步提升。显微硬度显著提高,当Al质量分数为10%时,硬度提升到538.56 HV,达到纯钛（220.59 HV）的2倍以上。耐磨性提高,样件的平均摩擦因数逐渐下降。抗压强度最高达到1 653.9 MPa,较纯钛样件提升164.48%,且优于退火后的纯钛板材（400~450 MPa）和SLM成形的TC4合金（1 128 MPa）。抗拉强度随着Al元素的上升,先上升后下降,但依然高于纯钛样件。通过原位合成思路与SLM技术的结合,对复合材料性能的提升具有重要意义。

Ti-Ti3Al metal composite prepared by in-situ synthesis is a good method to improve the properties of titanium matrix composites. In this paper, the influence of Al content on the microstructure and mechanical properties of in-situ synthesis Ti-Ti3Al metal composite produced by selective laser melting （SLM） was studied. The forming test of Ti-AlSi10Mg composite powder with different mixing ratios was carried out by SLM technology and in-situ synthesis technology, and the phase, microstructure, microhardness, wear performance, tensile and compression properties were analyzed. The results show that Al enters into Ti crystal during the forming process, forming Ti-Al substitution solid solution, which strengthens the solid solution of the sample and precipitates Ti3Al particle reinforced phases. With the increase of Al content, the mechanical properties of the sample gradually improved. The microhardness was significantly increased. When Al mass fraction was 10%, the hardness increased to 538.56 HV, reaching more than twice that of pure titanium (220.59 HV). The wear performance increases and the average friction coefficient of the sample decreases gradually. The maximum compressive strength reaches 1 653.9 MPa, which is 164.48% higher than the pure titanium sample, and better than the pure titanium plate after annealing (400-450 MPa) and the TC4 alloy formed by SLM (1 128 MPa). The tensile strength firstly increased and then decreased with the increase of Al, but it was still higher than the pure titanium sample. The combination of in-situ synthesis and SLM technology is of great significance to improve the properties of composite materials.