热处理对<110>取向Tb-Dy-Fe-Al合金组织和性能的影响  

Effect of heat treatment on microstructure and properties of <110> oriented Tb-Dy-Fe-Al alloy

作　　者：胡勇[1,2] 丁雨田[1,2] 王晓莉[1] 李晓诚[1] 王国斌[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050 [2]兰州理工大学温州泵阀工程研究院,浙江温州325105

出　　处：《材料热处理学报》2013年第3期44-49,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(11004091);浙江省自然科学基金(Y4090219);甘肃省自然科学基金(0916RJZA025);兰州理工大学红柳青年教师培养计划项目

摘　　要：采用区熔定向凝固方法制备了<110>取向的Tb0.3Dy0.7(Fe1-xAlx)2(x=0,0.05,0.10,0.15)超磁致伸缩合金,在真空管式炉氩气保护条件下,对合金进行930℃×2 h的热处理,研究了热处理对于不同含量Al元素替代合金的微观组织、磁致伸缩性能和力学性能的影响。结果表明:热处理不改变Tb0.3Dy0.7(Fe1-xAlx)2合金样品定向凝固形成的<110>轴向择优取向,热处理后的合金棒样品依然保持MgCu2型立方Laves相和部分稀土相结构,没有新相对应的衍射峰产生。热处理后Tb0.3 Dy0.7(Fe1-xAlx)2合金的片层组织退化,随着Al元素含量的增加,基体内的析出相形态和分布不断发生变化。当Al的添加量为x=0.05和x=0.15时,热处理后合金的磁致伸缩性能下降,饱和磁致伸缩分别为817×10-6,571×10-6。Al的添加量x=0.10时,热处理在不降低合金饱和磁致伸缩的同时可以显著提高其压缩强度及低场动态响应。〈 110 〉 orient-ed Tb0.3 Dy0.7 （ Fe1-x A1 ）2 （ x = 0,0.05,0. 10,0. 15 ） alloy was prepared by the method of zone-melting directional solidification and then annealed at 930℃for 2 h. The effect of heat treatment on microstrueture, magnetostriction and mechanical properties of the Tbo.3 Dyo.7 （Fel _A1 ）2 alloy was investigated. The results show that the primary phases of Tbo.3 Dyo.7 （Fe1-x A1 ）： alloy are the MgCu2-type cubic laves phase as well as some RE-rich phase structure and the unchange of the axial preferred orientation is observed by the heat treatment. With the increasing of A1 content, there are some RE （FeA1） 2 phase and RE （A1） phase precipitatied from the REFe2matrix, and the morphology and distribution of the precipitated phase varys with the heat treatment, while the lamellar microstructure is degraded and the resistance of magnetic domain rotation for REFe2 phase is reduced. The magnetization and magnetostriction measurements show that heat treatment decreases the saturation magnetostriction of the Tb0.3 Dyo.7 （Fel _A1 ）2 alloy （x = 0. 05,0. 15）, and the saturation magnetostriction are 817 × 10-6,571 ×10-6, respectively. Compression strength and low-field dynamic response of the Tbo. 3 Dy0. 7 （ Fe1-xA1 ） 2 alloy （ x = 0. 10） are significantly improved after heat treatment at 930℃ for 2 h and no reduction of saturation magnetostriction is detected.

关 键 词：Tb-Dy-Fe-Al合金 热处理 显微组织 磁致伸缩 力学性能 

分 类 号：TG111[金属学及工艺—物理冶金] TG115.27[金属学及工艺—金属学]