The paper examines the impact of heating temperature and isothermal holding time during sintering in a vacuum on the phase composition, structure, and mechanical properties of Fe3Al iron aluminide synthesized from a mixture of iron and aluminum powders. Dilatometric studies have shown the complexity of occurring changes in the density of the billets during sintering. First, the porosity increases from 15% in the initial billet to 45% during sintering at 950°C, and after decreases to 5% at a sintering temperature of 1450°C. The synthesis of intermetallic compounds at powder mixture heating was examined by the X-ray diffraction method. It was shown that up to 30% of intermetallic compound Fe2Al5 is formed during an hour-long isothermal holding at 600°C. Increasing the holding time to 3 hours or temperature to 950°C results in the formation and gradual growth of FeAl (B2) aluminide content. With a further increase of sintering temperature up to 1450°C, the amount of A2 phase becomes bigger, and concentration of iron and aluminum in it approaches to stoichiometric ratio Fe3Al. The mechanical properties of iron aluminide intensify with increasing sintering temperature, especially rapidly after sintering at 1450°C, when planar pores close and perfect interparticle contacts form.

中文翻译：

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烧结温度对铝化铁Fe3Al粉体结构和性能的影响

该论文研究了真空烧结过程中加热温度和等温保持时间对铁铝粉混合物合成的 Fe3Al 铝化铁的相组成、结构和机械性能的影响。膨胀测量研究表明在烧结过程中坯料密度发生变化的复杂性。首先，孔隙率从初始坯料的 15% 增加到 950°C 烧结期间的 45%，然后在 1450°C 烧结温度下降低到 5%。通过X射线衍射法研究了粉末混合物加热下金属间化合物的合成。结果表明，在 600°C 下保持一个小时的等温期间，形成了高达 30% 的金属间化合物 Fe2Al5。将保持时间增加到 3 小时或将温度增加到 950°C，会导致 FeAl (B2) 铝化物含量的形成和逐渐增长。随着烧结温度进一步升高至1450℃，A2相量变大，其中铁、铝浓度接近化学计量比Fe3Al。铝化铁的机械性能随着烧结温度的升高而增强，特别是在 1450°C 烧结后，当平面孔隙闭合并形成完美的颗粒间接触时，其机械性能会增强。