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Application of SPS consolidation and its influence on the properties of the FeAl20Si20 alloys prepared by mechanical alloying

机译：SPS合并的应用及其对机械合金化制备的FEAL20SI20合金性能的影响

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The FeAl20Si20 alloy was prepared by a combination of short-term mechanical alloying and spark plasma sintering. The processing parameters either of the mechanical alloying or spark plasma sintering were optimized to yield the maximal mechanical properties of the alloy. For the mechanical alloying, two amounts of powders batch (5 g or 20 g) were compared. The spark plasma sintering regimes combined pre-pressing prior heating and vice versa, direct and pulse current flow. The MA + SPS alloys exhibited ultrafine-grained microstructure composed of FeSi, Fe3Si and Fe3Al2Si3 phases (with an average crystallite size of approximately 30 nm) with a presence of randomly distributed Al2O3 particles (with diameters ranging from 5 to 100 nm). The FeSi, Fe3Si phases were supersaturated by Al, which resulted in an increase of lattice parameters. The hardness of the compact alloys reached up to approximately 1100 HV 0.1 for both the powder batches. The 20 g samples showed a standard deviation nearly half the of 5 g powder batches and the 20 g prepared by a regime combining prepressing prior heating up to consolidation temperature using pulse current flow resulted in the highest compressive strength of 2008 MPa. Combination of pre-pressing prior heating-up also reduced the increase of the Fe3Al2Si3 phase weight fraction especially in the 5 g alloys that otherwise had a tendency to microstructural coarsening.
机译：通过短期机械合金化和火花等离子体烧结的组合制备FEAL20SI20合金。优化了机械合金化或火花等离子体烧结中的处理参数，以产生合金的最大力学性能。对于机械合金化，比较两种量的粉末批次（5g或20g）。火花等离子体烧结制度组合预先压制的先前加热，反之亦然，直接和脉冲电流。 MA + SPS合金具有由FESI，Fe3SI和Fe3A12Si3相组成的超细粒化微观结构，其存在随机分布的Al 2 O 3颗粒（直径为5至100nm）。 FESI，Fe3SI相由Al过饱和，导致晶格参数增加。对于粉末批次，紧凑型合金的硬度达到大约1100HV 0.1。 20g样品显示标准偏差接近5g粉末批次的一半，并且通过使用脉冲电流的脉冲电流组合以先前加热至固结温度的调节器制备的20g，导致2008MPa的最高抗压强度。预先加热的组合也降低了Fe3Al2Si3相体重级分的增加，特别是在5g合金中，否则含有微观结构粗化的趋势。

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