采用区熔定向凝固的方法制备了〈110〉取向的TbDyFe超磁致伸缩合金,在800-1080℃分别进行2 h的回火处理,研究了回火处理对TbDyFe合金冲击韧性、断口形貌的影响.结果表明:在800和1080℃回火处理时合金的冲击韧性最好;高于共晶温度的回火处理,冲击韧性随着回火温度的提高而增加.回火处理引起富稀土相形态、尺寸、分布的变化是导致冲击韧性变化的主要原因,TbDyFe材料的断裂为解理断裂.
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