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采用透射电镜(TEM)、X射线衍射(XRD)和压缩试验,研究了氩气压力和稀释剂对铝热法制备的块体纳米晶Fe3Al材料组织和性能的影响。结果表明,在氩气压力分别为3、6、9MPa和稀释剂含量分别为0、20%、40%条件下制备的Fe3Al块体材料均为DO3有序结构,晶粒尺寸≤30nm;随氩气压力增加,材料晶粒尺寸无明显变化,但随稀释剂含量增加,材料晶粒尺寸明显减小。屈服强度随压力增加而提高,但与晶粒尺寸间无明显对应关系。当稀释剂含量不同时,材料晶粒尺寸与屈服强度呈反Hall-Petch关系。
The effects of argon pressure and diluent on microstructure and properties of bulk nanocrystalline Fe3Al composites prepared by aluminothermic reaction were investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD) and compression tests. The results show that the bulk materials of Fe3Al prepared under argon pressure of 3, 6, 9MPa and diluent contents of 0, 20% and 40% are all DO3 ordered structures with grain size ≤30nm. When the gas pressure increases, the grain size of the material does not change significantly, but with the increase of the diluent content, the grain size of the material decreases obviously. The yield strength increases with the increase of pressure, but there is no obvious corresponding relationship with the grain size. When the diluent content is different, the grain size and yield strength of the material show inverse Hall-Petch relationship.