细化剂和冷却速率对Al-Mg-Mn合金凝固组织的影响  

Effects of Refiner and Cooling Rate on Microstructure of an Al-Mg-Mn Alloy

作　　者：左玉波[1] 崔建忠[1] 赵志浩[1] 朱庆丰[1] 屈福[1] 王向杰[1] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110004

出　　处：《稀有金属》2008年第5期589-592,共4页Chinese Journal of Rare Metals

基　　金：国家"973"项目(2005CB623707)资助

摘　　要：细化剂含量和冷却速率对凝固过程具有重要影响。分别加入不同含量的Al-3Ti-B晶粒细化剂,研究其对一种Al-Mg-Mn合金晶粒组织的影响。结果表明,随着晶粒细化剂含量的增加,晶粒愈加细小,在本实验范围内当细化剂含量为0.1%Ti时,组织最为均匀细小。采用连续测温的方法,测定了使用不同铸模时,铸锭的冷却速率,并分析了冷却速率对凝固组织的影响。与使用耐火材料铸模相比,使用石墨铸模时,铸锭的冷却速率提高1～2个数量级,铸态组织得到显著细化,平均晶粒尺寸由138μm细化到35μm。Refiner content and cooling rate have important effects on solidification process. Al-3Ti-B refiners in different contents were added in the alloy to study the effects on grain size of Al-Mg-Mn alloy. The results showed that the grain size become smaller and smaller with increasing refiner content. In this experiment the smallest grain size was obtained as the refiner content being 0.1% Ti. The cooling rates in different molds were continuously measured and the effects of cooling rate on microstructure were studied. The results indicated that the cooling rate in graphite molds was one to two orders of magnitude higher than that in refractory mold. The average grain size of the ingot made in graphite mold was about 35 μm which was much finer than that of the ingot made in refractory mold （138 μm）.

关 键 词：细化剂 冷却速率 组织 铝合金 

分 类 号：TG146.2[一般工业技术—材料科学与工程]