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通过铝热反应法制备了含10 wt%Mo的纳米晶Fe3Al材料,并对制得的材料进行了600和800℃的等温热处理,利用XRD和TEM研究了等温热处理前后组织的变化,并测试了应力应变曲线和屈服强度。结果表明:等温热处理前后,材料的晶体结构没有发生变化,均由无序bcc结构的Fe3Al相组成;材料经热处理后的平均晶粒尺寸和屈服强度在600～800℃之间增加显著,并在800℃等温热处理8 h后分别达到最大值43 nm和960 MPa;热处理后,材料在断裂前的最大变形量提高了15%左右,并有良好的塑性变形平台,塑性显著提高。等温热处理是一种提高纳米晶材料综合力学性能的可行方法。
The nanocrystalline Fe3Al materials containing 10 wt% Mo were prepared by aluminothermic reaction and the isothermal heat treatment was performed on the obtained materials at 600 and 800 ℃. The changes of microstructure before and after isothermal heat treatment were studied by XRD and TEM. , And tested the stress-strain curve and yield strength. The results show that the crystal structure of the material does not change before and after the isothermal heat treatment, and all of them are composed of disordered bcc Fe3Al phase. The average grain size and yield strength of the material after heat treatment increase significantly between 600 and 800 ℃, And reached the maximum values of 43 nm and 960 MPa respectively after being isothermally treated at 800 ℃ for 8 h. After heat treatment, the maximum deformation of the material before fracture increased by 15%, and the plastic deformation platform was significantly improved. Isothermal heat treatment is a feasible way to improve the mechanical properties of nanocrystalline materials.