为揭示热轧退火态 Fe- 6.5 % Si(质量分数 )合金的形变机制 ,研究了该合金不同温度下的力学性能 ,并利用透射电子显微镜分析了其有序结构和拉伸样品中的位错组态 .结果表明 ,在中温拉伸过程中 ,热轧退火态 Fe- 6.5 % Si合金因位错塞积和位错缠结而导致加工硬化 ;该合金 B2有序结构温度下 ,出现了超点阵位错 ;在 80 0°C拉伸时 ,则呈现了 1 40 %的高延伸率 In order to reveal the deformation mechanism of hot-rolled annealed Fe-6.5% Si (mass fraction) alloy, the mechanical properties of the alloy at different temperatures were investigated. The ordered structure and the dislocations in the stretched samples were analyzed by transmission electron microscopy The results show that hot-rolled annealed Fe-6.5% Si alloy is hardened by dislocation plugging and dislocation entanglement during the middle-temperature drawing process. At B2 ordered structure temperature, Lattice dislocations; at 80 0 ° C stretching, then showing a high elongation of 140%