【摘要】 研究了有序和无序态Ｎｉ３Ｆｅ在室温下不同气氛（Ｏ２，空气和Ｈ２）中的力学性能，结果表明：有序态或无序态Ｎｉ３Ｆｅ不存在由空气中水汽诱发的环境氢脆；无序态Ｎｉ３Ｆｅ也不存在由氢气诱发的环境氢脆，但有序态Ｎｉ３Ｆｅ在Ｈ２中却有强烈的脆化作用，巨随形变速率降低而加剧；有序Ｎｉ３Ｆｅ的拉伸曲线出现了明显的屈服平台，而无序态没有，有序态强度高于无序态，扫描电镜观察表明：无序Ｎｉ３Ｆｅ在不同气氛中断裂时全部为韧性断口；有序Ｎｉ３Ｆｅ在空气和Ｏ２中也为穿晶韧性断口，但在Ｈ2中的断口形貌与形变速率有关：低形变速率时为沿晶断口，随形变速率增加为沿晶与穿晶的混合断口，高形变速率下全部为穿晶韧性断口更多还原

【Abstract】 The mechanical properties of ordered and disordered Ni₃Fe in various atmospheres （O₂,air, H₂） at ambient temperature have been investigated. The results show that there is no moistureinduced environmental embrittlement for the disordered and ordered Ni₃Fe when tested in air. The resultsalso indicate that no H₂-induced environmental embrittlement was observed for the disordered Ni₃Fewhen tested in gaseous hydrogen. However, the ordered Ni₃Fe is very sensitive to gaseous H₂-inducedenvironmental embrittlement, and the embrittlement becomes more severe as the strain rate decreases.There is a yield platform in the engineering stress-strain curve of ordered Ni₃Fe. However, there is noappreciable phenomena in disordered Ni₃Fe. The strength of ordered Ni₃Fe is higher than that of disorderedNi₃Fe. The fracture surface observation shows that the fracture modes of disordered Ni₃Fe in above threeenvironments are ductile transgranular. The fracture modes of ordered Ni₃Fe in O₂ and air are also ductile.However, The fracture mode of ordered Ni₃Fe in H₂ is dependent on the strain rate. It is intergranular at lower strain rate and ductile transgranular at higher strain rate.更多还原