以纳米陶瓷颗粒Si3N、AlN和常规Mg、Si粉为原料，采用机械合金化和真空热压相结合的方法制备Si3N/Mg2Si和AlN/Mg2Si纳米复合材料，并对样品的微结构和力学性能进行了表征。结果表明：随着纳米陶瓷颗粒体积分数由0％增加到20％，金属间化合物M g2Si的硬度得到了很大的提高，Si3N/M g2Si纳米复合材料的断裂韧性由0．59 MPa· m -1/2增加到1．38 MPa· m-1/2，而AlN/Mg2Si的断裂韧性却基本不随AIN的含量增加而改变。%Bulk ceramic/Mg2Si nanocomposites are prepared by mechanical alloying and hot-pressing in vacuum , and the microstructures and the mechanical properties are analyzed .The results indicate that the hardness of Mg2Si nanocomposites is improved by the addition of ceramic nanoparticles ,and the fracture toughness of Si3N/Mg2Si nanocomposites increases from 0 .59MPa · m-1/2 to 1 .38MPa · m-1/2 with the increase of the Si3N content from 0(vol .)% to 20(vol .)% ,while that of the AlN/Mg2Si nanocomposites changes little .
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