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采用雾化喷射沉积成形技术制备了含１０％（体积分数）ＡＩ２Ｏ３颗粒的１８Ｎｉ（２５０）马氏体时效钢金属基复合材料．沉积坯件具有高致密度、增强颗粒均匀分布、无界面反应等组织特征．同基体合金相比，复合材料表现出加速时效行为．经热处理后复合材料的拉伸强度接近基体材料，耐磨性明显提高．采用显微力学探针技术研究了复合材料的时效行为，发现在ＡＩ２Ｏ３颗粒附近存在陡峭的弹性模量和硬度分布，是热错配应力造成的位错密度分布引起的析出相分布变化的结果．
The 18Ni (250) martensitic steel matrix composites with 10% (volume fraction) AI2O3 particles were prepared by atomized spray deposition technique. Deposition billet has high density, uniform distribution of enhanced particles, no interface reaction and other organizational features. Compared with the matrix alloy, the composite exhibits accelerated aging behavior. After heat treatment the tensile strength of the composite material close to the matrix material, wear resistance improved significantly. The aging behavior of the composites was studied by using the micro-mechanical probe technique. The steep elastic modulus and hardness distribution near the AI2O3 particles were found, which were the result of the distribution of the precipitated phase due to the dislocation density distribution caused by the thermal mismatch stress.