重熔保温时间对Al-Ti-C中间合金微观组织及细化性能的影响  

Effects of the Holding Time of Remelting on the Microstructure and Grain Refining Performanc of Al-Ti-C Master Alloy

作　　者：丁万武[1,2] 赵文军[1,2] 夏天东[1,2] 侯运丰[1,2] 

机构地区：[1]兰州理工大学,甘肃省有色金属新材料省部共建国家重点实验室,兰州730050 [2]兰州理工大学,有色金属合金及加工教育部重点实验室,兰州730050

出　　处：《有色金属（冶炼部分）》2008年第6期42-46,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家863计划项目(2003AA33X050);甘肃省自然科学基金项目(3ZS042-B25-011)

摘　　要：利用Al、Ti、C粉末原料,采用铝熔体热爆法合成了相同成分不同微观组织形貌的两种Al-Ti-C中间合金晶粒细化剂。借助X射线衍射(XRD)、大型光学显微镜(MEF3)等分析手段研究了重熔保温时间对Al-Ti-C中间合金微观组织及细化效果的影响。结果表明:合成的两种Al-Ti-C中间合金均由Al、TiAl3和TiC组成。重熔时,保温时间对Al-Ti-C中间合金微观组织产生重要影响。随着重熔保温时间的延长,TiAl3会发生聚集、长大,而TiC颗粒有聚集倾向,但保温过程中,TiAl3和TiC相表现出较强的稳定性,并没有生成其他杂相如Al4C3等。重熔后的Al-Ti-C中间合金仍具有一定的晶粒细化能力。The effects of the holding time of remehing on the microstructure and grain refining performanc of Al-Ti-C master alloy with the same composition and different structural morphologies prepared by thermal explosion method of self-propagating high-temperature synthesis （SHS） in aluminum liquid with Al, Ti, C powder have been observed by X-ray diffraction （XRD）, large optical microscope （MEF3）, and other means. The results show that two kinds of the Al-Ti-C are composed by TiAl3, TiC and Al. The holding time of remehing has an remarkably impact on the Al-Ti-C microstructure. With the extension of holding time of remehing, TiAl3 aggregated and grown up, and TiC gathered, but TiAl3 and TiC have a strong performance of stability and there is no other miscellaneous such as Al4C3 in the process of remehing. The Al-Ti-C master alloys which have been rcmehed still have a certain grain refining capacity.

关 键 词：AL-TI-C中间合金 TIAL3 TIC 重熔保温时间 晶粒细化 

分 类 号：TG146.4[一般工业技术—材料科学与工程]