粉末锻造过程中Al-Si合金块体材料的微观结构变化  

Investigation on Microstructure Transformation of Al-Si Alloy Blocks

作　　者：燕顺[1] 刘锦云[1] 胡绍磊[1] 颜燕[1] 金梦[1] 程瑜[1] 查五生[1] 

机构地区：[1]西华大学材料科学与工程学院,成都610039

出　　处：《有色金属》2009年第3期10-12,共3页Nonferrous Metals

摘　　要：用粉末冶金法制备Al-Si共晶合金块体材料,研究烧结过程及冷锻工艺对块体材料显微形貌和抗压强度的影响。结果表明,合金颗粒在烧结过程中发生局部熔化,烧结坯的显微形貌呈现出带有较多孔隙网状结构,锻造坯的粉末颗粒在压力作用下彼此啮合,孔隙大大减少,成为更为致密的连续体,相对密度达到了97%。烧结和冷锻都能大幅度的提高材料的抗压强度,由于锻造坯的孔隙度远远小于烧结坯,锻造坯具有更好的塑性和更高的相对密度。The Al-Si alloy blocks are prepared by using powder-metallurgy process, and the influences of sintering and die-forging on the microstructure and compression strength of the blocks are investigated. The results show that the particles are partly melted and linked with each other during sintering, so the microstructure of sintering blocks is net-like. The forged blocks become densely homogeneous body because of the porosity reduction resulted from the particles engagement under the pressure, and the relative density reaches to 97%. The sintering and die-forging can sharply increase the compression strength of blocks, because the porosity of the btocks after die-forging is rather less than that before die-forging, the blocks after die-forging has a better ductility and a higher relative density.

关 键 词：金属材料 AL-SI合金 烧结 冷锻 显微结构 抗压强度 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TF124[金属学及工艺—金属材料]