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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Internal friction in microcrystalline magnesium reinforced by alumina particles
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Internal friction in microcrystalline magnesium reinforced by alumina particles

机译：氧化铝颗粒增强微晶镁的内摩擦

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摘要

Using internal friction measurement, changes in the microstructure of microcrystalline magnesium and magnesium with 3 vol. percent of Al_2O_3 microparticles and nanoparticles, due to thermal treatment, have been investigated. Materials have been thermally treated at increasing temperature and then the amplitude dependence of the logarithmic decrement was measured at room temperature. The thermal treatment influences the amplitude-dependent component of the decrement in composite with nanoparticles while in composite with microparticles no influence has been estimated. Thermal stresses induced in the composites due to a difference between thermal expansion coefficient of matrix and ceramic particles may create new dislocations during the cooling from elevated temperatures. Density of new dislocations depends on the particle size. The thermal stresses can achieve yield stress in the matrix and micro-glide of newly created dislocations as well as their annihilation may occur.
机译：使用内摩擦测量，微晶镁和3 vol.g镁的微观结构变化。由于热处理，对百分之二的Al_2O_3微粒和纳米颗粒进行了研究。在升高的温度下对材料进行了热处理，然后在室温下测量了对数减量的幅度依赖性。热处理影响具有纳米颗粒的复合材料中减量的幅度相关成分，而具有微粒的复合材料中没有影响。由于基质和陶瓷颗粒的热膨胀系数之间的差异，在复合材料中引起的热应力可能会在从高温冷却的过程中产生新的位错。新位错的密度取决于粒径。热应力可以在基体中获得屈服应力，并且新产生的位错以及可能发生的hil灭会产生微滑移。

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