Bc路径等径角挤压SiC_p/Al基粉末材料的显微组织及力学性能  

MICROSTRUCTURE AND PROPERTIES OF SiC_p/Al PARTICULATED COMPOSITE BY ECAP USING Bc ROUTE

作　　者：张翔[1] 李萍[1] 薛克敏[1] 李晓[1] 王成[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《粉末冶金工业》2012年第2期27-32,共6页Powder Metallurgy Industry

基　　金：高等学校博士学科点专项基金(20100111110003);安徽省优秀青年科技基金(10040606Y21)

摘　　要：以SiCp/Al基复合粉末材料为研究对象,在250℃下采用粉末包套-等径角挤压工艺沿Bc路径成功将粉末颗粒直接固结成高致密度的块体细晶材料。结果表明:复合粉末材料成分分布均匀性和致密度在等径角挤压强烈的剪切细化作用下效果显著。初始SiC平均粒径为13.69μm,复合粉末初始相对密度为0.75,经过3个道次等径角挤压后,得到相对密度达0.97接近完全致密,SiC颗粒得到一定程度细化且分布均匀的细晶组织,平均显微硬度高达75HV,约为工业致密纯铝的2.2倍,初始SiC颗粒的尖锐棱角特征也得到明显改善。压缩性能测试表明,挤压后SiCp/Al基复合材料表现出明显优于工业纯铝的变形行为特征。SiCp/Al particulate composites were successfully consolidated into near fully dense bulk material with fine grains at 250℃ by Powder in Tubes-Equal Channel Angular Pressing（PITS-ECAP）.The results show that the grains are greatly squashed and refined with uniform size distribution after 3 passes.The microhardness and density increases gradually with increasing pass.The compression test shows that the plastic behavior of the composites is much different from the aluminum matrix material.It is indicated that the high density and fine structure of the powder materials are due to severe plastic shear deformation,high hydrostatic pressure and effective strain accumulation.

关 键 词：铝基复合材料 SIC 等径角挤压 显微组织 力学性能 

分 类 号：TF122[冶金工程—粉末冶金]