稀土元素对铝结晶过程的影响  

The Influence of Rare Earth Elements on the Crystal Process of Aluminium Alloy

作　　者：郑志强[1] 梅玮[2] 陈克燕[3] 杨福林[4] 

机构地区：[1]南昌大学机电工程学院,江西南昌330029 [2]江西制造职业技术学院机械系,江西南昌330001 [3]南昌大学科技处,江西南昌330047 [4]江铃陆风汽车股份有限责任公司,江西南昌330001

出　　处：《南昌大学学报（工科版）》2004年第3期11-14,共4页Journal of Nanchang University(Engineering & Technology)

基　　金：江西省自然科学基金资助项目(0250015);江西省教育厅资助项目

摘　　要：针对铝合金半固态成型时,温度区间非常狭窄这一难点,讨论了稀土元素对铝结晶过程的影响.实验结果表明:在纯铝中加入稀土元素后,不但使铝合金的结晶温度区间加宽,而且使铝合金的结晶时间延长,同时,铸模材料的导热性也对稀土元素在铝结晶过程中作用产生影响,低导热性的铸模将增强稀土元素对结晶过程热力学及动力学影响的作用.这样将有利于半固态成型技术的实现.This paper aims to solve the problem that when aluminium alloy is semi-solid forming,the scope of temperature is very narrow.It discusses that rare earth elements have influence on the crystal process of (aluminium.)Experiments demonstrate that pure aluminium added some rare earth elements is not only to widen the scope of crystal temperature but also to lengthen the crystal time,the action of rare earth on the crystal (process) of (aluminium) is influenced by the thermal conductivity of mold (material,)the lower thermal conductivity of mold (material) is more favorable to action of rare earth on crystallographic thermodynamics and dynamics.These two factors are in favor of realizing technique of semi-solid forming.

关 键 词：半固态 铝合金 稀土元素 结晶 

分 类 号：TG244.3[金属学及工艺—铸造]