定向凝固Fe83Ga15Al2合金的结构及磁致伸缩性能  

Structure and magnetostriction performance of directionally solidified alloy Fe_(83)Ga_(15)Al_2

作　　者：丁雨田[1,2] 周质光[1] 胡勇[1,2] 刘妍妍[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：《兰州理工大学学报》2013年第1期1-5,共5页Journal of Lanzhou University of Technology

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的资助

摘　　要：系统研究不同定向凝固速率下Fe83Ga15Al2合金的相组成和磁致伸缩性能.结果表明,经过区熔定向凝固后,Fe83Ga15Al2合金的晶粒尺寸与铸态相比要大得多.当凝固速率较高时,晶粒没有明显的取向性,而当速率较低时,显示出沿轴向的取向性,同时也存在很多横向亚晶界.铸态的Fe83Ga15Al2合金在经过区熔定向凝固之后,磁性能有大幅度提高,低场响应快,且磁致伸缩值增大,凝固速率v=10μm/s时,磁致伸缩系数达到最大值53×10-6;当v=300μm/s时,λ值略低,为50×10-6,但其低场响应迅速,在50kA/m时就达到最大值.Structure and magnetostriction of alloy Fe83Ga15Al2 were systematically studied by means of directional solidification with various solidification rate.The result indicated that,after directional solidification,the crystalline grains of alloys were greatly coarser than in as-cast.When the solidification rate was higher,the grains would not show noticeable trendency to orienting;when the rate became lower,the trendency to orienting would be in the longitudinal direction and meantime,many crosswise subgrain boundary would appear.The magnetostriction of as-cast alloy Fe83Ga15Al2 would be increased to a great extent after directional solidification and its low-field response was fast.The magnetostriction value would also be increased.The magnetostriction coefficient（λ） would reach its maximum as 53×10-6.When the solidification rate was 10 μm/s;When the solidification rate was 300 μm/s,the value of λ was lower a little bit as 50×10-6.But its low-field response was fast,reaching its the maximum as 50 kA/m.

关 键 词：定向凝固 FE-GA合金 相结构 磁致伸缩性能 

分 类 号：TG136[一般工业技术—材料科学与工程]