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The influence of stirring parameters (stirring temperature, stirring speed and stirring time) on the particle distribution of 10%(volume fraction) SiC particulate reinforced AZ91 composites (SiCp/AZ91) was studied. It is found that it is necessary for 10μm SiC particulate reinforced AZ91 composites to stir the molten composites in semi-solid condition with vortex formation, or else the cluster of the reinforcements would not be eliminated. Compared with the monolithic alloy, the SiCp/AZ91 composite has higher strength, especially for yield strength, but the elongation is reduced. For the as-cast composite, the particles often segregate within the grain boundary regions. Extrusion can effectively reduce the segregation of SiC particles and improve the mechanical properties of the composite. The extrusion-induced reduction in particle size varies with extrusion temperatures and extrusion ratios. The effect of extrusion-induced reduction in particle size on the mechanical properties of the composites is not always beneficial. 相似文献
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采用水冷铜坩埚真空感应熔炼技术制备了名义成分为Ti-12Nb-12Zr-2Mo(质量分数,%)的合金,对获得的样品在真空热处理炉中进行热处理。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及力学测试等技术对铸态和热处理后得到样品的显微组织和力学性能进行系统研究。结果表明:铸态和退火状态下合金的组织均由α和β相组成,淬火状态下合金组织由α′和β相组成。热处理有利于提高合金的强度,而不改变合金的弹性模量。 相似文献