胡勇,丁雨田,王晓莉,李晓诚,王国斌

• 1:兰州理工大学甘肃省有色金属新材料重点实验室
• 2:兰州理工大学温州泵阀工程研究院

摘要(Abstract)：

采用区熔定向凝固方法制备了<110>轴向择优取向的Tb0.3Dy0.7Fe2超磁致伸缩合金,在真空管式炉氩气保护条件下,对合金进行不同温度和时间的热处理,研究了不同处理时间、处理温度、冷却条件对该合金取向、组织、磁致伸缩性能以及力学性能的影响。结果表明:热处理不改变定向凝固形成的轴向择优取向;经930℃×2 h热处理后,网状的富稀土相基本转变为球状并均匀分布在基体相内,定向凝固形成的片层状组织发生退化,减小了REFe2相的磁畴在磁场中转动的阻力。细小的球状富稀土相均匀弥散分布在基体相内,减少了应力集中,因此提高了磁致伸缩性能和压缩强度;定向凝固Tb-Dy-Fe合金采用930℃×2h热处理后随炉冷却的工艺可以获得良好的综合性能,其饱和磁致伸缩为1226×10-6,压缩强度为256 MPa。

关键词(KeyWords)： Tb-Dy-Fe合金;热处理;显微组织;磁致伸缩;力学性能

Abstract:

Keywords:

基金项目(Foundation): 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

作者(Author): 胡勇,丁雨田,王晓莉,李晓诚,王国斌

DOI: 10.13289/j.issn.1009-6264.2012.11.006

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