碳化硅粒子增强铝基复合材料轧制成型机理

发布时间：2018-04-22 23:05

本文选题：铝基复合材料 + 热压缩　；参考：《青海大学》2015年硕士论文

【摘要】：本实验利用搅拌铸造法制备了低体积分数Si Cp/Al复合材料,并对材料的热变形行为进行了研究。通过扫描电镜、光学显微镜等设备,对铸态的Si Cp/Al复合材料及经过热变形后的复合材料的显微组织进行了分析,研究了热变形参数对材料显微组织以及对材料内碳化硅分布的影响;利用Gleeble-3500、万能试验机等试验设备对碳化硅复合材料的机械性能进行了测试。对碳化硅增强铝基复合材料在设定的不同压缩速率以及不同的压缩温度下进行了热压缩试验。实验结果表明:在给定的试验条件下热压缩过程中碳化硅增强复合材料的峰值应力随变形温度的降低而升高,随着应变速率的增大而增大,呈现出明显正的敏感性;经计算分析可得:在给定试验范围内,最适合用来描述复合材料的应变速率、变形温度和应力之间的本构关系为幂指数。根据应力应变的关系,做出了热加工图,为材料的热加工提供了依据。对热轧后的复合材料进行了机械性能测试。轧制可以明显改善复合材料铸造缺陷,提高材料的机械性能。轧制温度对复合材料的边裂有很大的影响;随着轧制道次的提高,复合材料的拉伸强度和延伸率有了很大的提高。利用?扫描法研究了该复合材料的热变形织构。经过轧制后的复合材料中存在111、200和220织构,都表现为弱织构。
[Abstract]:In this experiment, low volume fraction Si Cp/Al composites were prepared by agitation casting, and the thermal deformation behavior of the composites was studied. The microstructures of as-cast Si Cp/Al composites and hot deformed composites were analyzed by means of scanning electron microscope and optical microscope. The influence of thermal deformation parameters on the microstructure and distribution of sic in the material was studied, and the mechanical properties of sic composites were tested by Gleeble-3500 and universal testing machine. The thermal compression tests of silicon carbide reinforced aluminum matrix composites were carried out at different compression rates and different compression temperatures. The experimental results show that the peak stress of sic reinforced composites increases with the decrease of deformation temperature and increases with the increase of strain rate under given experimental conditions. By calculation and analysis, it can be concluded that the constitutive relation between strain rate, deformation temperature and stress is power exponent in the given range of test. According to the relationship between stress and strain, the hot working diagram is made, which provides the basis for material thermal processing. The mechanical properties of hot rolled composites were tested. Rolling can obviously improve the casting defects of composite materials and improve the mechanical properties of the composites. The rolling temperature has a great influence on the edge crack of the composites, and the tensile strength and elongation of the composites increase greatly with the increase of rolling pass. Use? The thermal deformation texture of the composite was studied by scanning method. After rolling, there are 111200 and 220 textures in the composites, both of which are weak texture.
【学位授予单位】：青海大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB333;TG335.8

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