中文摘要：

采用电弧熔炼法制备了Fe81Ga19合金多晶样品，研究了不同热处理工艺对合金组织结构及磁致伸缩性能的影响。样品经过700℃、800℃和900℃保温后采用空冷、炉冷和淬火3种冷却方式。结果显示，经过不同热处理后样品的微观组织均为单相bcc结构，而磁致应变从34×10^-6到94×10^-6不等；当热处理温度为800℃时，淬火处理后可获得较好的磁致伸缩性能（88×10^-6），而热处理温度较高（900℃）时，采用炉冷的方式可获得较好的磁致伸缩性能（94×10^-6）。推测热处理方式和晶体取向对Fe81Ga19合金磁致伸缩性能有较重要的影响。

英文摘要：

Button ingots of polycrystalline Fe81Ga19 alloy are prepared by arc-melter, and the effects of different heat-treatments on their microstructure and magnetostriction are investigated. The specimens are annealed at 700℃, 800℃, and 900℃, and then cooled at different speeds, i.e. quenching into ice water, air cooling, or furnace cooling. The results show that specimens after different heat-treatments all exhibit single bcc structure, but the magnetostrictions vary from 34 × 10^-6 to 94 × 10^-6; When the heating temperature is 800℃, good magnetostriction （88 × 10^-6） can be obtained by quenching. On the other hand, when the specimen is heated at a higher temperature （900℃）, furnace cooling is a better way to get good magnetostriction （94×10^-6）. It is speculated that the heat-treatment temperature and the crystal orientation may be two primary factors influencing the magentostriction of Fe81Ga19 alloy.