Cu原子簇触发形核下的深过冷Ag-Ge合金组织演变研究  

Microstructural Evolution of the Deeply Undercooled Ag-Ge Alloys with Cu Atoms Cluster Triggered Nucleation

作　　者：孙玉峰[1] 刘晓芳[1] 王育人[2] 魏炳忱[2] 

机构地区：[1]郑州大学,河南郑州450002 [2]中科院力学所国家微重力室,北京100080

出　　处：《稀有金属材料与工程》2006年第5期732-735,共4页Rare Metal Materials and Engineering

基　　金：中科院知识创新工程空间材料科学研究项目(KJCX2-SW-L05)

摘　　要：采用玻璃包覆的方法获得具有较大过冷度的亚共晶、共晶以及过共晶Ag-Ge合金熔体,并通过高能离子束轰击Cu箔产生Cu原子团簇溅射到过冷合金熔体中来触发非均质形核过程。凝固后合金显微组织的分析结果表明:在深过冷合金熔体中引入Cu原子团簇,它对亚共晶、共晶以及过共晶Ag-Ge合金的显微组织演变有着不同的影响效果,分析了显微组织的演变规律与形成机制。The Ag-Ge alloy melts with deeply undercooled hypoeutectic, eutectic and hypereutectic were obtained via glass fluxing technique. The nucleation of the deeply undercooled alloy melts were triggered by atoms cluster sputtering on the surface of the melts. The atoms clusters were generated by an ion beam bombarding on the Cu foil fixed above the alloy melts. The resultant microstructure reveals that the induced atom clusters exert great influence on the microstructural evolution of the highly undercooled eutectic and hypereutectic Ag-Ge alloys, but no obvious influence on the highly undercooled hypoeutectic alloy. The microstructural evolution and formation mechanism were analyzed and discussed.

关 键 词：玻璃包覆 深过冷 显微组织 侧向生长 

分 类 号：TG156.91[金属学及工艺—热处理]