Abstract
The effects of hot extrusion and addition of Al2O3p on both microstructure and tribological behavior of 7075 composites were investigated via optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and transmission electron microscopy (TEM). The experimental consequences reveal that the optimal addition of Al2O3p was 2 wt%. After hot extrusion, the Mg(Zn,Cu,Al)2 phases partially dissolve into the matrix and generate many uniformly distributed aging precipitation particles, the Al7Cu2Fe phases are squeezed and broken, and the Al2O3p become uniform distribution. The microhardness of as-extruded 2 wt% Al2O3p/7075 composites reaches HV 170.34, increased by 41.5% than as-cast composites. The wear rate of as-extruded 2 wt% Al2O3p/7075 composites is further lower than that of as-cast composites under the same condition. SEM-EDS analyses reveal that the reinforced wear resistance of composites can put down to the protective effect of the Al2O3p reinforced transition layer. After hot extrusion, the transition layer becomes stable, which determines the reinforced wear resistance of the as-extruded composites.
摘要
通过光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)和透射电子显微镜(TEM)研究了热 挤压和Al2O3p 的添加对7075 复合材料的微观结构和摩擦学行为的影响。实验结果表明,Al2O3p 的最 佳添加量为2%(质量分数)。经热挤压后,Mg(Zn,Cu,Al)2 相部分溶解到基体中,并且产生了许多均匀 分布的时效析出颗粒,Al7Cu2Fe 相被挤压并破碎,Al2O3p 分布变得均匀。2%质量分数的Al2O3p/7075 复合材料的显微硬度达到HV 170.34,相比铸态复合材料提高了41.5%。在相同条件下,挤压态2%质 量分数的Al2O3p/7075 复合材料的磨损率比铸态复合材料的磨损率更低。SEM-EDS 分析表明,复合材 料耐磨性的增强主要取决于Al2O3p 增强的过渡层的保护作用。经过热挤压后,摩擦过渡层变得稳定, 这使得挤压态复合材料的耐磨性增强。
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The overarching research goals were developed by YAN Hong, LEI Yu-shun and WEI Zhi-fan. LEI Yu-shun and WEI Zhi-fan provided the measured microstructure and tribological behavior data, and analyzed the measured data with XIONG Jun-jie and ZHANG Peng-xiang. WAN Jian-ping and WANG Zhi-lu have provided the corresponding materials and equipment. The initial draft of the manuscript was written by LEI Yu-shun, WEI Zhi-fan. All authors replied to reviewers’ comments and revised the final version.
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LEI Yu-shun, YAN Hong, WEI Zhi-fan, XIONG Jun-jie, ZHANG Peng-xiang, WAN Jianping and WANG Zhi-lu declare that they have no conflict of interest.
Foundation item: Project(51965040) supported by the National Natural Science Foundation of China; Project(20181BAB206026) supported by the National Science Foundation of Jiangxi Province, China
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Lei, Ys., Yan, H., Wei, Zf. et al. Effect of hot extrusion on microstructure and tribological behavior of Al2O3p reinforced 7075 aluminum-matrix composites. J. Cent. South Univ. 28, 2269–2284 (2021). https://doi.org/10.1007/s11771-021-4768-9
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DOI: https://doi.org/10.1007/s11771-021-4768-9