本发明提供了一种增材制造用钛铝基合金粉末材料，由以下原子百分比的原料制成：Al 47％～56％，Cr 1.6％～2.3％，Mo 1.6％～2.0％，TiB2 0.6％～1.2％，余量为Ti和不可避免的杂质；另外，本发明还提供了制备该合金粉末材料的方法：一、采用陶瓷导流内芯对石墨导流管的内壁进行保护；二、在石墨导流管的端面处制备防高温碳化涂层后将其装入熔炼室中；三、采用真空自耗电弧熔炼制备锭坯；四、采用水冷铜坩埚熔炼制备合金熔液；五、雾化处理得到增材制造用钛铝基合金粉末材料。该合金粉末材料是为增材制造工艺设计的合金体系，采用该合金粉末材料通过增材制造技术制得的产品，其各项性能均达到了预期效果。

The invention provides a titanium and aluminum based alloy powder material for additive manufacturing. The titanium and aluminum based alloy powder material is prepared from the following raw materials in percentage by atom: 47 to 56 percent of Al, 1.6 to 2.3 percent of Cr, 1.6 to 2.0 percent of Mo, 0.6 to 1.2 percent of TiB2 and the balance of Ti and unavoidable impurity. In addition, the invention also provides a method for preparing the alloy powder material. The method comprises the following steps of I, protecting the inner wall of a graphite flow guiding pipe by adopting a ceramic flow guiding inner core; II, preparing high-temperature-preventing carbonized coatings at the end surfaces of the graphite flow guiding pipe and then loading the graphite flow guiding pipe into a smelting chamber; III, preparing an ingot blank by adopting vacuum self-consuming arc smelting; IV, smelting to prepare an alloy melt by adopting a water-cooled copper crucible; V, carrying out atomization treatment, so that the titanium and aluminum based alloy powder material for the additive manufacturing is obtained. The alloy powder material is an alloy system designed for the additive manufacturing process and various properties of a product manufactured through the additive manufacturing technique by adopting the alloy powder material can reach expected effects.