Abstract

The work is aimed at establishing the effect of nanosecond electromagnetic pulses (NEPs) with different amplitudes on the formation of the structure of cast aluminum matrix composites of the pseudo-binary Al–Mg₂Si system with hypoeutectic (5 wt % Mg₂Si) and hypereutectic (15 wt % Mg₂Si) composition. With an increase in the amplitude of the generator of NEPs in alloys with 5 and 15 wt % Mg₂Si, the structural components of the matrix alloy (α-solid solution and eutectic) are refined, while no significant differences in the sizes and morphology of primary crystals of Mg₂Si in the hypereutectic range of compositions were observed in the entire range of tested variants of the amplitude of the generator of NEPs. Presumably, the observed nature of the influence of NEPs on the structure of composites in the hypereutectic region of compositions is associated with the features of their crystallization behavior. The temperature range of the existence of the two-phase region L + Mg₂Si is much lower than the temperatures of irradiation with NEPs; apparently, in connection with this, NEPs do not affect the thermodynamic state of the interfaces “primary crystal Mg₂Si–melt.” It has been shown that a promising option for the simultaneous modifying effect on all structural components of Al–Mg₂Si aluminum matrix composites (solid solution, eutectic, primary Mg₂Si particles) is a combination of thermal-rate treatment and irradiation of melts with NEPs, as well as additional processing of melts by NEPs during solidification.

中文翻译：

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纳秒电磁脉冲熔体加工参数对铸铝基复合材料组织形成的影响

摘要

这项工作旨在确定具有不同幅度的纳秒电磁脉冲 (NEP) 对具有亚共晶 (5 wt% Mg ₂ Si)的拟二元 Al-Mg ₂ Si 体系的铸铝基复合材料结构形成的影响。和过共晶（15 wt% Mg ₂ Si）组成。随着 5 和 15 wt % Mg ₂ Si 合金中 NEPs 发生器振幅的增加，基体合金的结构成分（α-固溶体和共晶）得到细化，而尺寸和形貌没有显着差异Mg ₂的初晶在 NEPs 发生器振幅的整个测试变体范围内观察到组成过共晶范围内的 Si。据推测，观察到的 NEP 对组合物过共晶区域复合材料结构的影响性质与其结晶行为的特征有关。两相区L + Mg ₂ Si 存在的温度范围远低于NEPs 的辐照温度；显然，与此相关的是，NEP 不会影响界面“初级晶体 Mg ₂ Si-熔体”的热力学状态。已经表明，对 Al-Mg _{2的所有结构成分同时改性效果的有希望的选择}硅铝基复合材料（固溶体、共晶、初级 Mg ₂ Si 颗粒）是热处理和 NEP 熔体辐照的组合，以及在凝固过程中 NEP 对熔体的额外处理。