The paper examines the effect of high-energy grinding and post-treatment conditions on the structure and physical and mechanical properties of iron aluminide Fe–15 wt.% Al obtained by sintering and impulse hot pressing. It was shown that the grinding of a mixture of iron and aluminum powders in a planetary mill results in the formation of lamellar particles whose morphology is preserved in the alloy structure after sintering and impulse hot pressing. After grinding, sintered intermetallic compounds obtained from powder mixtures demonstrate low physical and mechanical properties due to the low quality of grain boundaries. The use of impulse hot pressing for compaction of samples from milled powders at temperatures of 850–1150°C significantly increases the density of intermetallic compounds compared to sintered materials of a similar composition—from 5 to 6.5 g/cm3. The increase in the temperature of impulse hot pressing contributes to an increase in mechanical characteristics, where the maximum values of bending strength and fracture toughness are 880 MPa and 21 MPa · m0.5, respectively. Subsequent hightemperature annealing (1350–1450°C) leads to an improvement of the quality of grain boundaries with the formation of a predominantly discontinuous grid, coagulation of impurity segregation, and, as a result, to a sharp increase in bending strength and fracture toughness, which are 1400 MPa and 27 MPa · m0.5, respectively. It was shown that the interparticle rupture observed in the samples after impulse hot pressing at relatively low temperatures changes to transcrystalline after hightemperature annealing.

中文翻译：

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工艺参数对烧结和脉冲热压法获得的粉末Fe-Al金属间化合物结构和性能的影响

本文研究了高能研磨和后处理条件对通过烧结和脉冲热压获得的铝化铁 Fe–15 wt.% Al 的结构和物理机械性能的影响。结果表明，在行星磨机中研磨铁和铝粉的混合物会形成层状颗粒，其形态在烧结和脉冲热压后保留在合金结构中。研磨后，从粉末混合物中获得的烧结金属间化合物由于晶界质量低而表现出较低的物理和机械性能。与类似成分的烧结材料相比，使用脉冲热压在 850-1150°C 的温度下压实来自研磨粉末的样品可显着增加金属间化合物的密度 - 从 5 到 6.5 g/cm3。脉冲热压温度的升高有助于提高机械特性，其中弯曲强度和断裂韧性的最大值分别为 880 MPa 和 21 MPa · m0.5。随后的高温退火 (1350–1450°C) 导致晶界质量的改善，形成主要不连续的网格，杂质偏析凝结，因此弯曲强度和断裂韧性急剧增加，分别为 1400 MPa 和 27 MPa · m0.5。