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首页> 外文期刊>Journal of Materials Engineering and Performance >Implications of Degree of Thermal Shocks on Flexural Properties of Cu-Al2O3 Micro- and Nano-composites
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Implications of Degree of Thermal Shocks on Flexural Properties of Cu-Al2O3 Micro- and Nano-composites

机译：热冲击度对Cu-Al2O3微纳米复合材料弯曲性能的影响

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摘要

This investigation reports the effect of thermal shock of different gradients, i.e., immediate transition from high temperature to cryogenic environment and vice versa on the flexural properties of Al2O3 particulate reinforced Cu metal matrix micro-and nano-composites fabricated by powder metallurgy route. The specimens were also thermally conditioned at high as well as sub-zero temperatures separately. The specimens were subjected to 3-point flexural test followed by fractography, and the fracture micro-characteristics were studied under field emission scanning electron microscopy and transmission electron microscopy to predict the dislocation behavior under induced thermal stresses and mismatch. The degree of improvement in flexural strength is higher for the composites experiencing lower degree of thermal shock, i.e., improvement in flexural strength is higher for a thermal shock of 80 degrees C than for 160 degrees C temperature gradients. Particle pull-out, crack entrapment, and physical outgripping of alumina particles act as the operative mechanisms during fracture of thermally shocked composites.
机译：该研究报道了不同梯度的热冲击，即从高温到低温环境的立即转变，反之亦然，对通过粉末冶金法制备的Al 2 O 3颗粒增强的Cu金属基体微米和纳米复合材料的挠曲性能的影响。还分别在高温和零下温度对样品进行了热调节。对样品进行三点弯曲试验，然后进行分形术，并在场发射扫描电子显微镜和透射电子显微镜下研究断裂的微观特征，以预测在诱导的热应力和失配下的位错行为。对于经历较低程度的热冲击的复合材料，弯曲强度的改善程度较高，即，对于80℃的热冲击，其弯曲强度的改善高于对温度梯度为160℃的复合物。在热冲击复合材料的断裂过程中，氧化铝颗粒的颗粒拉出，裂纹截留和物理抓握是作用机理。

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