稀土元素在ZL101合金中的偏聚状态及对α相生长的影响  

Asymmetry Distribution of Rare Earth Element on ZL101 and Influence on α Solidification

作　　者：郑志强[1] 熊新根[1] 易荣喜[2] 王丽[1] 裴志昆[1] 

机构地区：[1]南昌大学,南昌330029 [2]井冈山大学,江西吉安343009

出　　处：《有色金属》2010年第1期6-9,共4页Nonferrous Metals

基　　金：江西省自然科学基金资助项目(0250015)

摘　　要：通过在铝硅合金中添加稀土元素,促进固液两相区的固相-α相的球化生长,以满足半固态成型技术对半固态坯料的要求。稀土元素在α相界面前沿的偏聚改变了α相生长的热力学条件,使α相的生长趋于均匀化,提高了α相球化效果,同时阻碍了α相的生长,细化了晶粒。在ZL101加入稀土元素后,使合金中的α相得到了球化,球化效果与稀土的加入量有关,当稀土加入量为0.50%时为最佳,稀土元素还能细化α相的晶粒。The elements of rare earth are added to Al-Si alloys to promote the growth of α-phase ball in solid-liquid two-phase,to meet the requirements of semi-solid billet in semi-solid forming technology.The thermodynamic conditions of α-phase growth are varied by the asymmetry distribution of RE in the forefront of the α-phase interface,the α-phase growth is more uniform and improve the effect of α-phase ball,the growth of α-phase is hindered and fined crystal tablets are formed.When the RE is added to AlSi7,the α...

关 键 词：金属材料 铝硅合金 稀土 半固态 凝固 

分 类 号：TG146.21[一般工业技术—材料科学与工程]