以Ni粉和Al粉为原料,通过机械合金化和真空热压烧结制备了高致密的NiAl-5％Al2O3(体积分数,下同)复合材料,并利用烧结-锻造技术制成了该材料的前缘模拟件.机械球磨后,粉末颗粒充分细化,Ni和Al发生原位反应,并最终生成NiAl-5％Al2O3复合材料粉末.经1300℃真空热压烧结,获得致密的NiAl-Al2O3复合材料.Al2O3颗粒以“晶界型”和“内晶型”的形式均匀分布在NiAl基体中.NiAl和A12O3平均晶粒尺寸约为400nm和100nm.与细晶NiAl相比,材料的断裂韧度明显增加,压缩强度得到很大提高.通过烧结-锻造短流程技术制备的前缘模拟件晶粒细小,表面质量较高,其硬度达575HV以上.
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