摘要
对铝热反应法制备的分别含5%、10%和15%Cr(质量分数)的块体纳米晶Fe3Al材料在1 000℃等温退火8 h,利用XRD研究退火态纳米晶Fe3Al材料的晶体结构和平均晶粒尺寸,并用TEM对含10%Cr的Fe3Al合金的微观组织进行表征。结果表明:材料的晶体结构为无序bcc结构;随Cr含量升高,3种材料的平均晶粒尺寸分别为26、29和36 nm。压缩性能研究表明:等温退火后材料的流变应力随Cr含量的增加而明显降低,材料具有较大的塑性变形量。
Bulk nanocrystalline Fe3Al-based materials with 5%, 10% and 15% （mass fraction） Cr respectively were prepared by aluminothermic reaction, and followed by annealing treatment at 1 000 ℃ for 8 h. The crystal structures and average grain sizes of the materials were investigated by X-ray diffraction, and the microstructures of the 10%Cr materials were investigated by transmission electron microscopy. The results show that the crystal grain of the three materials are disordered bcc structure. With increasing Cr content, the average grain sizes of the three materials are 26, 29 and 36 nm, respectively. Compressive property investigation indicates that the flow stress of the material after annealing decreases with increasing Cr content, and the alloys after annealing have a considerable plastic deformation.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2013年第6期846-850,共5页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(51164022)
