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首页> 外文期刊>Journal of Materials Engineering and Performance >Response of Al-Based Micro- and Nanocomposites to Rapid Fluctuations in Thermal Environments
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Response of Al-Based Micro- and Nanocomposites to Rapid Fluctuations in Thermal Environments

机译：基于Al基微粒和纳米复合材料在热环境中快速波动的响应

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The focus of this work is to highlight the relative response of Al-based micro- and nanocomposites in the form of enhancement in flexural strength via induced thermal stresses at high and cryogenic temperatures in ex situ and in situ atmospheres. In this investigation, we have tried to explore the reliability, matrix-reinforcement interaction and microstructural integrity of these materials in their service period by designing appropriate heat treatment regimes. Al-Al2O3 micro- and nanocomposites had been fabricated by powder processing method. The micro- and nanocomposites were subjected to down-thermal shock (from positive to negative temperature) and up-thermal shock (from negative to positive temperature) with varying thermal gradients. For isothermal conditioning, the composites were exposed to + 80 and - 80 A degrees C for 1 h separately. High-temperature three-point flexural tests were performed at 100 and 250 A degrees C on the composites. All the composites subjected to thermal shock and isothermal conditioning was tested in three-point flexural mode post-treatments. Al-1 vol.% Al2O3 nanocomposite's flexural strength improved to 118 MPa post-thermal shock treatment of gradient of 160 A degrees C. The Al-5 and 10 vol.% Al2O3 microcomposites possessed flexural strength of 200 and 99.8 MPa after thermal shock treatment of gradient of 160 and 80 A degrees C, respectively. The observed improvement in flexural strength of micro- and nanocomposites post-thermal excursions were compared and have been discussed with the support of fractography. The microcomposites showed a higher positive scale of response to the thermal excursions as compared to that of the nanocomposites.
机译：本作作品的重点是突出抗基微粒和纳米复合材料的相对响应，以抗弯曲强度的增强形式通过诱导的热应力在出原位的高和低温温度下的热应力和原位环境中。在这项调查中，我们试图通过设计适当的热处理制度在其服务期间探讨这些材料的可靠性，矩阵加强相互作用和微观结构完整性。通过粉末加工方法制造了Al-Al2O3微型和纳米复合材料。通过不同的热梯度对微量和纳米复合材料进行下热冲击（从正至负温度）和上热冲击（从负至正温度）。对于等温调理，复合材料分别暴露于+ 80和-80℃下1小时。在复合材料上以100和250℃进行高温三点弯曲试验。在三点弯曲模式后处理后经过热冲击和等温调节的所有复合材料。 Al-1 Vol。％Al2O3纳米复合材料的弯曲强度改善为160℃的梯度后的118MPa后热冲击处理。Al-5和10 Vol.％Al2O3微型复合材料在热冲击处理后具有200和99.8MPa的弯曲强度为200和99.8MPa分别为160和80度的梯度。比较热偏移后热偏移的微型和纳米复合材料的抗弯强度的观察到，并已通过Fractography讨论。与纳米复合材料相比，微孔复合材料显示出对热偏移的响应较高的正规模。

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