温度引起的 Al - Si 系统熔体结构变化对固态合金结构和电阻的影响

V. V. Khristenko, M. V. Arshuk, O. M. Donii
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引用次数: 0

摘要

根据之前的研究结果,发现在加热 Al + 17.6 % Si 熔体的过程中,电阻的温度依赖性曲线的特点是存在几个急转弯。这为断言特定系统熔体的结构可能因温度而发生变化提供了依据。然而,熔体过热时发生的变化是否会在随后的冷却过程中保留下来,这仍然是一个未决问题。温度引起的铝硅熔体结构变化对合金固态结构和性能的影响问题也需要更详细的研究。根据 [1] 方法对熔体进行了电阻测量研究。在五个特征温度值下冷却过热的铝+17.6%硅熔体时,通过电阻值来评估熔体保持温度引起的变化的能力。为避免不平衡造成的误差,只考虑在给定温度下熔体电阻稳定后获得的结果。温度引起的熔体结构变化是通过从液态淬火得到的固态样品的结构进行评估的。在 720 ℃、880 ℃、960 ℃ 和 1050 ℃ 温度下进行熔体等温保温后获得的样品的特定电阻值和材料微观结构确定了熔体过热时发生的变化对固体合金结构和性能的影响性质。电阻明显滞后现象的存在表明,熔体过热时发生的变化在冷却过程中得以保留。研究还证实,特定的变化会影响固态合金的特性(尤其是比电阻)和微观结构(首先,熔体过热会影响原生硅颗粒的大小)。关键词:铝、硅、热力学平衡、熔体、电阻。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of temperature-induced changes in Al – Si system melt structure on structure and electrical resistance of alloy in solid state
According to the results of previous studies, it was found that the temperature dependence of electrical resistance during heating of the Al + 17,6 % Si melt curve characterized by presence of several sharp inflections. This gave grounds for asserting possibility of temperature-induced changes in structure of specified system melts. However, it remains an open question whether the changes that occurred when melt was overheated are preserved during subsequent cooling. The problem of effect of temperature-induced changes in Al–Si melts structure on the structure and properties of the alloy in the solid state also requires a more detailed study. Resistometric studies of melt were carried out according to the method [1]. The ability to preserve temperature-induced changes in melt was assessed by electrical resistance value during cooling of the overheated Al + 17,6 % Si melt at five characteristic temperature values. To avoid errors cozied by imbalance, only results obtained after stabilization of melt resistance at a given temperature were taken into account. Temperature-induced changes in melt structure were evaluated by structure of solid samples obtained by quenching from the liquid state. The nature of influence of changes that occur when the melt is overheated on solid alloy structure and properties was determined by specific electrical resistance values and material microstructures of samples obtained after melt isothermal holding at temperatures of 720 °C, 880 °C, 960 °C and 1050 °C. The presence of electric resistance significant hysteresis can indicate that the changes that occurred during melt overheating are preserved during its cooling. It was also established that the specified changes affect to properties (in particular, specific electrical resistance) and the microstructure of the solid alloy (first of all, the melt overheating affects to size of primary silicon particles). Keywords: aluminum, silicon, thermodynamic equilibrium, melts, electrical resistance.
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