纳米Fe_3Al粉体及块体材料的制备及表征

SYNTHESIS AND CHARACTERISTICSOF NANO BULK Fe_3Al INTERMETALLLIC ALLOY

分别利用氢电弧等离子体法及机械合金化制取纳米Fe3Al粉体.氢电弧等离子体法制备的纳米Fe3A1粒子为球形,粒径为50～100 nm,粒度分布较均匀,呈部分有序的B2相结构.由机械化合金化制得的Fe3A1粉体存在着较高的缺陷浓度及晶格畸变.热压烧结制备Fe3AI块体材料的洛氏硬度为61 HRC,室温抗弯强度和断裂韧度分别高达1 300MPa和49MPa·m1/2.

Fe2Al nano-powder were synthesized by hydrogen arc plasma method and mechanical alloying (MA), respectively. The Fe3Al power prepared by hydrogen arc plasma method had B2 structure, with gain size of 50-100 nm and sphericity appearance. Compared with the Fe3Al power prepared by MA had higher concentration of defect and crystal lattice distortion than the power gained by hydrogen arc plasma method. The hardness (HRC), room bending strength and fracture toughness of hot-pressed sintered bulk Fe3Al are 61, 1 300 MPa and 49 MPa·m1/2, respectively.