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采用真空电弧熔炼/退火制备了Cr/Al复合合金化Fe3Si基有序合金。通过XRD、SEM对试样进行表征,同时对其显微硬度、压缩强度及弯曲强度等力学性能进行了综合分析。结果表明,Cr/Al复合合金化Fe3Si基有序合金主相仍为Fe3Si相。元素Al,Cr复合合金化较为明显的改善了Fe3Si基有序合金的脆性。Fe65Si25Cr5Al5的抗压和抗弯强度最高,这是因自身高的有序度而呈现的陶瓷性的高强度低应变量特征。有序合金表现出明显的解理断裂特征,Fe80 Si10 Cr5Al5表现出二次解理的特征,Fe75 Si15 Cr5 Al5和Fe70 Si20 Cr5 Al5在断裂时出现了一些韧性特征的撕裂棱,这应与自身适中的有序度有关。
The Cr / Al alloyed Fe3Si based ordered alloys were prepared by vacuum arc melting / annealing. The samples were characterized by XRD and SEM, and their mechanical properties such as microhardness, compressive strength and flexural strength were analyzed. The results show that the main phase of Fe3Si-based ordered alloy of Cr / Al composite alloying is still Fe3Si phase. Element Al, Cr composite alloying significantly improved the brittleness of Fe3Si-based ordered alloys. Fe65Si25Cr5Al5 has the highest compressive and flexural strength due to its high degree of ceramic-like high-strain and low-strain characteristics due to its high degree of orderliness. The ordered alloys show obvious cleavage fracture characteristics. Fe80Si10Cr5Al5 shows the characteristics of secondary cleavage. Some tearing edges of Fe75Si15Cr5Al5 and Fe70Si20Cr5Al5 show some ductile characteristics at the time of fracture, which should be related to their own Moderate degree of order.