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采用真空电弧熔炼退火制备了Fe3(Si1-x,Alx)(x=0.2,0.4,0.6)Fe3Si基金属间化合物.通过XRD和SEM对制备出的试样进行表征,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,Fe3(Si1-x,Alx)金属间化合物仍然保持Fe3Si物相不变.Al的合金化改性降低了Fe3Si金属间化合物的显微硬度,有利于改善Fe3Si的脆性.Fe3(Si0.67,Al0.33)表现出较Fe3Si高的抗压和抗弯强度,这是其适中的有序度值与变形过程中加工硬化作用的综合结果.Fe3(Si1-x,Alx)表现出明显的二次解理特征,这利于断裂过程中裂纹能量的释放,从而提高其强度.
The Fe3 (Si1-x, Alx) (x = 0.2,0.4,0.6) Fe3Si-based intermetallic compounds were prepared by vacuum arc melting annealing.The prepared samples were characterized by XRD and SEM, and their microhardness, Compressive strength and flexural strength were studied.The results show that the Fe3Si intermetallic compound keeps the Fe3Si phase unchanged.The alloying modification of Al reduces the microstructure of the Fe3Si intermetallic compound Hardness, which is beneficial to improve the brittleness of Fe3Si.Fe3 (Si0.67, Al0.33) shows higher compressive and flexural strength than Fe3Si, which is a combination of moderate degree of order value and work hardening in the deformation process As a result, Fe3 (Si1-x, Alx) shows obvious secondary cleavage characteristics, which facilitates the release of crack energy during fracture and thus enhances its strength.