摘要
A l-Ti和A l-Ti-C中间合金对消失模铸造AZ91镁合金组织的试验研究表明,与常用变质剂C2C l6相比,加入A l-Ti和A l-Ti-C中间合金对消失模铸造AZ91镁合金具有更好的组织细化效果和更高的力学性能,而加入A l-Ti-C中间合金的作用效果最佳。A l-Ti-C及A l-Ti中间合金的加入提高了共晶反应的离异化程度,晶界上的β相由连续网状变为不连续块状和孤立的粒状结构且分布均匀。A l-Ti-C中间合金对消失模铸造AZ91镁合金晶粒细化是其晶粒生长抑制作用和引入形核质点综合作用的结果。
The paper investigates effects of Al-Ti and Al-Ti-C master alloy additions on microstructures of LFC AZ91 magnesium alloy. Results indicate the following： compared with addition of common refiner C2Cl6 , LFC AZ91 magnesium alloy has finer microstructures and higher mechanical properties with additions of Al-Ti and Al-Ti-C master alloy, and the effects of Al-Ti-C addition are the best. With addition of Al-Ti and Al-Ti-C, eutectic reaction is more divorcing, the netted and divorced eutectic β phase along grain boundaries changes to lump and even to isolated particles, and distributes more uniformly. The grain refinement mechanism of LFC AZ91 alloy by Al-Ti-C master alloy is attributed to both growth restriction effects and the introduction of nucleant particles.
出处
《机械科学与技术》
CSCD
北大核心
2005年第11期1282-1284,共3页
Mechanical Science and Technology for Aerospace Engineering
基金
中国博士后科学基金项目(2005037697)资助
