快速凝固对A356-K_2ZrF_6体系原位合成Al_3Zr/A356复合材料组织的影响  

Effect of Rapid Solidification on Microstructure of In-Situ Synthesized Al_3Zr/A356 Composites in A356-K_2ZrF_6 System

作　　者：许可[1] 

机构地区：[1]中国船舶科学研究中心,无锡214082

出　　处：《机械工程材料》2010年第10期43-45,78,共4页Materials For Mechanical Engineering

基　　金：教育部重点基金资助项目(00170);江苏省科技成果转化项目(BA2005054);江苏省高技术研究项目(BG2005026)

摘　　要：采用X射线衍射仪、电子探针和扫描电镜等研究了快速凝固条件下A356-K2ZrF6体系熔体反应法原位合成Al3Zr/A356复合材料的凝固组织。结果表明:单辊旋淬快速凝固条件下原位合成的Al3Zr颗粒细小,呈长方体状,尺寸为3～4μm,比常规金属型凝固增强颗粒尺寸减小1～2μm,同时单辊旋淬快速凝固相对于常规金属型凝固增强颗粒更易于被凝固前沿的枝晶所捕获,颗粒分布更加均匀;另外单辊旋淬快速凝固相对于常规金属型凝固复合材料基体A356合金组织中的初晶α-Al细小,共晶硅相形态大部分以颗粒状或小块状存在,且在基体中分布均匀。The solidification microstructure of the in-situ synthesized A13Zr/A356 composites by the direct melt reaction method in the A356-K2ZrF6 system under rapid solidification condition was investigated by X-ray diffraction, transmission electron microscope and scanning electron microscope. The results indicate that the Ala Zr particles synthesized under rapid solidification of single roller melt spinning was fine and in the shape of rectangle, the size was about 3--4 t2m, which was 1--2 ptm shorter than that of the particle under the conventional metal mold solidification. And compared to the conventional metal mold solidification, the reinforced particles under rapid solidification became easier to be captured by the dendritics in the rim of the solidification, and the particles distributed more uniform. Its primary crystal ^-A1 in the composite substrate A356 alloy become refiner, eutectic silicon existed in the forms of granulate and small bulk, which uniformly distributed in the substrate.

关 键 词：快速凝固 原位合成 复合材料 凝固组织 

分 类 号：TB331[一般工业技术—材料科学与工程]