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=300 μm/s时,λ值略低,为50×10-6,但其低场响应迅速,在50 kA/m时就达到最大值.%Structure and magnetostriction of alloy Fe83Ga15 Al2 were systematically studied by means of directional solidification with various solidification rate. The result indicated that, after directional solidifica-tion, 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 Fe83 Ga15 Al2 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 (A) would reach its maximum as 53×10-6. When the solidification rate was 10 μm/s; When the solidification rate was 300 ptm/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.
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