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首页> 外文期刊>Materials Science and Engineering >Microstructural evolution and mechanical behavior of ultrasonically synthesized Al6061-nano alumina composites
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Microstructural evolution and mechanical behavior of ultrasonically synthesized Al6061-nano alumina composites

机译：超声合成Al6061-纳米氧化铝复合材料的组织演变与力学行为

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摘要

Al6061 alloy matrix composites reinforced with 1, 2 and 3 wt% nano-alumina particles are fabricated by ultrasound solidification technique. Application of high intensity ultrasonic vibrations to the melt resulted in uniform dispersion of alumina particles up to 2 wt% additions of reinforcement. Tensile strength of the composites increased while the ductility is retained as compared to the base alloy. Addition of nano-particles above this threshold value of 2 wt% led to poor distribution and clusters of alumina particles, along with thermal stress induced micro-cracks. Theoretical calculations and TEM studies revealed that thermal mismatch between the matrix and reinforcement contributed dominantly to the yield strength up to 2 wt% reinforcement additions, beyond which the thermal mismatch stresses led to formation of micro cracks. From among the various strengthening models, theoretical yield strength values calculated using the quadratic summation method showed good agreement with the experimental yield strength values for 1 and 2 wt% reinforced nano-composites.
机译：通过超声凝固技术制备了以1、2和3wt％的纳米氧化铝颗粒增强的Al6061合金基复合材料。在熔体上施加高强度超声波振动会导致氧化铝颗粒均匀分散，最多可添加2 wt％的增强材料。与基础合金相比，在保持延展性的同时，复合材料的拉伸强度得以提高。超过此阈值2 wt％的纳米颗粒的添加导致氧化铝颗粒的分布不均和团簇，以及热应力引起的微裂纹。理论计算和TEM研究表明，基体和增强材料之间的热失配主要导致屈服强度达到2 wt％的增强配筋，超过此比例，热失配应力导致形成微裂纹。在各种强化模型中，使用二次求和法计算的理论屈服强度值与1和2％（重量）增强纳米复合材料的实验屈服强度值显示出良好的一致性。

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