使用激光气相合金化方法，氮气气氛下在铝钛合金表面进行氮化处理。结果发现：氮化层由ＴｉＮ和ＴｉＡｌ相构成，ＴｉＮ以枝晶形式在氮化层均匀分布。材料横截面显微硬度连续变化。氮化程度随作用时间的增加而增加，辐照的激光能量密度越高，氮化层的厚度越大。当激光功率密度、扫描速度、氮气喷射压强分别为３．３５×１０５Ｗ·ｃｍ－２，３００ｍｍ·ｍｉｎ－１，０．３５ＭＰａ时，表面显微硬度为ＨＶ７００，氮化层的厚度达到２００μｍ。比较表明，相同条件时，铝钛合金的氮化程度和氮化层厚度均小于金属钛。 Using a laser vapor alloying method, a nitriding treatment is performed on the surface of the aluminum-titanium alloy under a nitrogen atmosphere. The results show that the nitride layer consists of TiN and TiAl phases, and TiN is uniformly distributed in the nitride layer in the form of dendrites. Material cross-section of the micro-hardness changes continuously. The degree of nitridation increases with the increase of reaction time, and the higher the laser energy density is, the greater the thickness of the nitride layer. When the laser power density, scanning speed and nitrogen ejection pressure were 3.35 × 105W · cm-2,300mm · min-1 and 0.35MPa respectively, the microhardness of the surface was HV700 and the thickness of the nitride layer was 200μm. The comparison shows that under the same conditions, the degree of nitriding and the thickness of nitrided layer of aluminum-titanium alloy are both smaller than those of titanium metal.