【作者】 任榕； 吴玉程； 汤文明； 郑治祥；

【Author】 REN Rong~1,WU Yu-cheng~2,TANG Wen-ming~2,ZHENG Zhi-xiang~2 (1.No.38 Research Institute of CETC,Hefei 230088,China; 2.School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

【机构】 中国电子科技集团公司第三十八研究所； 合肥工业大学材料科学与工程学院；

【摘要】 采用机械合金化及真空热压烧结制备硼化物颗粒原位增强FeAl基纳米复合材料块体。对热压块体的相组成、烧结块体的微观结构、微区成分及断口形貌进行了观察分析,还对块体的抗弯强度及硬度进行了测试分析。结果表明,经1473K保温1h下热压烧结的块体由FeAl及原位形成的TiB₂及Al₂O₃构成,其晶粒尺寸分别约为26.3和23.3nm。FeAl基纳米复合材料块体的致密度为96.7%,具有较高的抗弯强度（1210 MPa）和硬度(758HV₁₀)。更多还原

【Abstract】 Bulk boride particles in-situ reinforced FeAl matrix nanocomposites were fabricated using the mechanical alloying and vacuum hot-pressing technique.Phases of the hot pressed bulk,and microstructure,microzone compositions and the fracture morphology of the hot pressed bulk were investigated.Moreover,mechanical properties of the bulk were also tested.The results show that FeAl,TiB₂ and A1₂O₃ were determined to be the main phases in the bulk after vacuum hot pressing the Fe-Al-Ti-B powders milled for 50h at 1473K for 1h with average crystalline sizes of 26.3nm and 23.3nm,respectively.The bulk FeAl matrix nanocomposite has a relative density of 96.7%with relatively high bending strength（1210 MPa） and hardness(758HV₁₀).更多还原