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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Thermal Stresses on the Thermal Expansion and Damping Behavior of ZA-27/Aluminite Metal Matrix Composites
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Effect of Thermal Stresses on the Thermal Expansion and Damping Behavior of ZA-27/Aluminite Metal Matrix Composites

机译：热应力对ZA-27 /铝矾土金属基复合材料热膨胀和阻尼行为的影响

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摘要

When the fabrication of a metal matrix composite (MMC) involves its cooling from a high temperature, plastic-elastic residual deformation fields can be generated within and around the particle due to the differential thermal expansion between the particle and matrix metal. The present investigation is concerned with the effect of thermal residual stresses on the thermal expansion and damping behavior of aluminite particulate-reinforced ZA-27 alloy MMCs. Composites were prepared by the compocasting technique with 1, 2, 3, and 4 wt. percent of aluminite reinforcement. Thermal expansion and damping properties have been studied experimentally as a function of temperature over a temperature range 30 to 300 deg C both in the heating and cooling cycle. The thermal expansion studies exhibited some residual strain, which increased with the increase in the weight percent of the reinforcement. The damping capacity of both the composites and matrix alloy is found to increase with the increase in temperature during the heating cycle, whereas in the cooling cycle, damping behavior exhibits a maximum, which becomes more pronounced with the increase in the weight percentage of the reinforcement. The appearance of the maximum may be linked with dislocation generation and motion as a result of plastic deformation of the matrix at the metal/reinforcement interface. This phenomenon is attributed to the thermal stresses generated as a result of coefficient of thermal expansion (CTE) mismatch between the composite constituent phases. The thermal stresses have been estimated in both the cases using simple modes.
机译：当金属基质复合材料（MMC）的制造涉及从高温冷却时，由于颗粒与基质金属之间的热膨胀差异，会在颗粒内部和周围产生塑性弹性残余变形场。目前的研究是关于残余热应力对铝酸盐颗粒增强的ZA-27合金MMC的热膨胀和阻尼行为的影响。通过复合浇铸技术制备具有1、2、3和4wt。％的复合材料。铝酸盐增强材料的百分比。在加热和冷却循环中，均已根据温度在30至300摄氏度范围内的温度对温度的函数进行了热膨胀和阻尼特性的实验研究。热膨胀研究显示出一些残余应变，该残余应变随着增强材料的重量百分比的增加而增加。发现复合材料和基体合金的阻尼能力都随着加热周期中温度的升高而增加，而在冷却周期中，阻尼行为表现出最大值，随着增强材料重量百分比的增加，阻尼行为变得更加明显。 。由于基质在金属/增强界面处的塑性变形，最大值的出现可能与位错的产生和运动有关。该现象归因于由于复合组成相之间的热膨胀系数（CTE）不匹配而产生的热应力。在两种情况下都使用简单模式估算了热应力。

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