稀土Y与喷射沉积技术对铝铁合金组织和性能的影响  

Effect of rare earth yttrium and spray forming technology on microstructure and properties of Al-Fe alloy

作　　者：戴琨 汪志刚[1,2] 王和斌 叶洁云[1,2] DAI Kun;WANG Zhigang;WANG Hebin;YE Jieyun(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Jiangxi Nonferrous Metal Processing Engineering Technology Research Center,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学,材料冶金化学学部,江西赣州341000 [2]江西理工大学,江西省有色金属加工工程技术研究中心,江西赣州341000

出　　处：《有色金属科学与工程》2021年第6期113-122,共10页Nonferrous Metals Science and Engineering

基　　金：江西省教育厅科学技术研究资助项目(GJJ200847)。

摘　　要：普通凝固条件下得到的铸造Al-Fe合金中存在粗大的针状或片状初生富铁相,严重割裂基体,引起应力集中,恶化合金性能。利用稀土Y对Al-6Fe合金进行微合金化处理,结合快速凝固技术,并辅以热挤压技术,获得较常规凝固条件下更加细小均匀的显微组织,以解决铝铁合金中粗大的针片状富铁相割裂基体的问题。实验结果表明,稀土元素Y抑制了初生富铁相生长的趋势,将粗大针片状富铁相细化为菱形和短棒状,一定程度上减小了合金的第二相尺寸;稀土Y微合金化结合快速凝固技术,使得铝铁合金中形成了细小弥散的三元Al-Fe-Y金属间化合物,极大细化了第二相,在改善组织形貌的同时提升了合金的硬度和屈服强度。There are coarse acicular or flake primary iron-rich phases in the cast Al-Fe alloy obtained under ordinary solidification conditions,which seriously split the matrix,cause stress concentration and deteriorate the alloy performance.In this paper,Al-6Fe alloy was microalloyed with rare earth Y,combined with rapid solidification technology and assisted by hot extrusion technology,to obtain a finer and more uniform microstructure than that under conventional solidification conditions,so as to solve the problem that the coarse needle-like iron-rich phase in Al-Fe alloy splits the matrix.The results show that the growth trend of primary iron-rich phase is inhibited by rare earth element Y,and the coarse acicular iron-rich phase is refined into diamond and short rod shape,which reduces the second phase size of the alloy to a certain extent.The combination of rare earth Y microalloying and rapid solidification technology enables the formation of fine and dispersed ternary Al-Fe-Y intermetallic compound in Al-Fe alloy,which greatly refines the second phase and impromtes the hardness and yield strength of the alloy while improving the microstructure.

关 键 词：Al-Fe-Y合金 喷射沉积 快速凝固 热挤压 稀土Y 初生富铁相 

分 类 号：TG146.43[一般工业技术—材料科学与工程] TF124.3[金属学及工艺—金属材料]