喷射沉积高硅铝合金的半固态触变成形  

Semi-solid thixoforming of spray formed high silicon hypereutectic Al-Si alloy

作　　者：赵爱民[1] 甄子胜[1] 毛卫民[1] 崔成林[1] 孙峰[1] 姜春梅[2] 钟雪友[1] 

机构地区：[1]北京科技大学铸造研究所,北京100083 [2]北京联合大学应用技术学院,北京100101

出　　处：《中国有色金属学报》2000年第S1期126-131,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金!资助项目 ( 59771 0 1 1 )

摘　　要：研究了喷射沉积高硅铝合金在半固态触变成形过程中的规律。结果表明 :喷射沉积Al 2 0 %Si,Al 30 %Si,Al 30 %Si 2 %Ni,Al 30 %Si 2 %RE和Al 30 %Si 2 %Ni 2 %RE具有良好的半固态触变成形性能 ;半固态挤压压力比固态挤压压力明显降低 ,喷射沉积快速凝固形成的细小硅相 ,使其半固态浆料具有很好的流动性和充填性能 ,半固态组织中未熔α使半固态坏料具有良好的形状保持性。触变成形后微观组织更加均匀 ,致密度大幅度提高。Thixoforming properties of spray formed high silicon hypereutectic Al Si alloys were studied. It is shown that spray formed Al 20%Si, Al 30%Si, Al 30%Si 2%RE and Al 30%Si 2%Ni 2%RE billets have good thixoforming properties. The semisolid extrusion force is remarkably decreased compared with the solid extrusion process, which is because of the existence of the fine silicon crystals and the spherical α phases. Fine silicon crystals in microstructures of spray formed alloys make the semisolid slurry have good fluidity. The spherical α phases existing in semisolid mushy make the semisolid billets have shape holding ability. The microstructures become more homogeneous and the densities increase notably after semisolid thixoforming.

关 键 词：喷射沉积 高硅铝合金 半固态触变成形 

分 类 号：TG14[一般工业技术—材料科学与工程]