低凝固速率时Y元素对ZL114A合金中共晶硅的变质机理  

Modification Mechanism of Y Element on Eutectic Silicon of ZL114A Alloy during Low Solidification Rate

作　　者：罗传彪 吴桢 陆政 高文理[3] 毛郭灵 LUO Chuanbiao;WU Zhen;LU Zheng;GAO Wenli;MAO Guoling(AECC Beijing I nstitute of Aeronautical Materials,Beijing 100095,China;Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications,Beijing 100095,China;Hunan University,College of Materials Science and Engineering,Changsha 410082,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]北京市先进铝合金材料及应用工程技术研究中心,北京100095 [3]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《热加工工艺》2021年第12期55-58,共4页Hot Working Technology

摘　　要：利用DSC曲线、凝固曲线、扫描电镜(SEM+EBSD)和透射电镜(TEM)研究了低凝固速率时Y元素对ZL114A合金中共晶Si的变质机理。结果表明,在低凝固速率时,随着Y元素的添加,ZL114A合金的共晶Si由板片状变为细化纤维状;Y元素的添加缩短了共晶Si形核生长所需要的时间;Y元素的添加在共晶Si生长界面前沿产生了成分过冷,增加了共晶Si的形核核心;Y元素没有诱导共晶Si中孪晶的生成。The modification mechanism of eutectic Si in ZL114A alloy by Y element at a low solidification rate was studied by DSC curve, solidification curve, scanning electron microscopy(SEM+EBSD) and transmission electron microscopy(TEM). The results show that at a low solidification rate, with the addition of Y element, the eutectic Si of ZL114A alloy changes from plate to fine fiber. The addition of Y element shortens the time needed for eutectic Si nucleation growth. The addition of Y element produces component supercooling at the front of eutectic Si growth interface, which increase the nucleation cores of eutectic Si. Y element does not induce the formation of twins in eutectic Si.

关 键 词：Y元素 ZL114A合金 共晶Si 变质机理 

分 类 号：TG2443[金属学及工艺—铸造] TG146[一般工业技术—材料科学与工程]