熔炼工艺对AM60B-3Sr镁合金显微组织的影响  

Influence of Melting Process on Microstructure of AM60B-3Sr Magnesium Alloy

作　　者：冒国兵[1] 张光胜[1] 孙宇峰[1] 

机构地区：[1]安徽工程科技学院安徽高性能有色金属材料省级实验室,安徽芜湖241000

出　　处：《铸造》2009年第8期836-838,共3页Foundry

基　　金：芜湖市科技计划项目(芜科计[2006]91);安徽工程科技学院青年基金(2006YQ037)

摘　　要：采用RS-7130E型光学显微镜、D8Focus型X射线衍射仪(XRD)和带有能谱仪(EDS)的S4800型扫描电子显微镜(SEM),研究了不同熔炼温度和时间对AM60B-3Sr镁合金铸态显微组织的影响。试验结果表明:在670℃保温15min和700℃保温15min两种熔炼工艺条件下,AM60B-3Sr合金的铸态组织中都有Mg17Al12共晶相,未发现有锶化物新相形成;在730℃保温15min熔炼工艺条件下,合金的铸态组织由α-Mg枝晶和沿枝晶界分布的层片状α-Mg+Sr5Al9共晶组成;在735℃熔炼时,随保温时间的增加,共晶组织的数量增加,晶粒尺寸减小。By using of RS-7130E optical microscope, D8 Focus X-ray diffractometer, S4800 scanning electron microscope with energy spectrometer, the effects of melting process on microstructure of AM60B-3Sr magnesium alloy have been systematically investigated. Experimental results indicate that no new phase such as AI4Sr other than Mg17AI12 eutectic phase was found in AM60B-3Sr magnesium alloy in condition that holding 15 min at 670℃ or holding 15 min at 700 ℃, respectively. But, the Sr5Al9 new phase forms in AM60B-3Sr magnesium alloy when holding 15 min at 730℃, and no AI4Sr or MglTAI12 was found. Thus, the as-cast microstructure of AM60B-3Sr magnesium alloy consists of dendritic α-Mg and α-Mg＋SrsAI9 eutectic phase. With prolonging of the holding time, the quantity of eutectic structure increases and grain size reduces when holding at 735 ℃.

关 键 词：熔炼工艺 AM60B-3sr镁合金 显微组织 

分 类 号：TG146.22[一般工业技术—材料科学与工程]