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首页> 外文期刊>Materials Science and Engineering >Microstructural, mechanical, and wear properties characterization and strengthening mechanisms of Al7075/SiCnp composites processed through ultrasonic cavitation assisted stir-casting
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Microstructural, mechanical, and wear properties characterization and strengthening mechanisms of Al7075/SiCnp composites processed through ultrasonic cavitation assisted stir-casting

机译：通过超声波空化辅助铸造加工AL7075 / SIDNP复合材料的微观结构，机械和磨损性能和强化机理

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摘要

In this investigation, A17075 matrix composites reinforced with nano-SiC particles were manufactured using an ultrasonic cavitation assisted stir casting approach. The microstructural characterization by SEM confirms the presence of nano-SiC particles with all the composites, particle size, and with reasonably homogeneous particle dispersion. Characterization by EDS and XRD confirm no trace of oxide formations, and secondary phase or impurities formations with the composites. Optical microscopic examinations shown matrix phase grain refinement due to the presence of nano-SiC particles as-well-as the aggressive ultrasonic cavitation effect. The mechanical properties of the composites have been substantially improved with an increased amount of nano-SiC particles. The manufactured composites demonstrated an outstanding yield strength of 284 MPa with the only 2.0 wt% reinforcement of nano-SiC particles which is 94.52% improvement compared with the yield strength of the ultrasonically treated A17075 matrix alloy. The strength of A17075/SiCnp composites has been estimated by various models of strengthening mechanisms. The strengthening contribution due to thermal mismatch is more dominant followed by Orowan strengthening, Hall-Petch mechanism, and load transferring effect for A17075/ SiCnp composites. The strengthening contributions of CTE difference, dislocations interactions between matrix-reinforcement particles, grain-refinement, and load transfer mechanism increased monotonically for the increased percentage of SiCnp content with the composite. The wear resistance of the composites was found as superior to the matrix alloy and was continuously decreased rapidly up to 750 m of sliding distance while it was protracted up to 2250 m. The composite with 2.0% nano-SiC particles reinforcement has shown approximately 79.8% improvement in wear resistance compared with the matrix alloy.
机译：在该研究中，使用超声波空化辅助搅拌浇铸方法制造具有纳米SiC颗粒的A17075基质复合材料。 SEM的微观结构表征证实了所有复合材料，粒度和合理均匀颗粒分散体的纳米SiC颗粒的存在。 EDS和XRD的表征在于用复合材料确认没有氧化物形成的痕迹和二次相或杂质形成。光学显微镜检查显示基质相晶粒细化由于纳米SiC颗粒的存在 - 作为富有侵蚀性超声波空化效果。复合材料的机械性能随着纳米颗粒的量增加而基本上改善。制造的复合材料表现出284MPa的出色屈服强度，其增强的纳米颗粒仅为2.0wt％，与超声处理A17075基质合金的屈服强度相比，改善了94.52％。通过各种模型的强化机制估算了A17075 / SICNP复合材料的强度。由于热不匹配导致的加强贡献更大，随后是orowan强化，霍尔 - 竖起机制，以及A17075 / SICNP复合材料的负载转移效果。 CTE差异，基质增强颗粒，晶粒细化和载荷转移机制之间的脱位相互作用的加强贡献单调地增加了SICNP含量与复合材料的增加。将复合材料的耐磨性被发现为优于基质合金，并且连续降低至750米的滑动距离，同时延伸至2250μm。与基质合金相比，具有2.0％纳米颗粒增强件的复合材料显示出约79.8％的耐磨性。

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