【摘要】 利用透射电子显微镜(TEM)、电子探针、X射线衍射仪等微观分析技术,研究了Al65Cu20Fe15准晶颗粒 Al基复合材料在不同热压工艺条件下的显微组织结构,以探明组织结构的变化对该新型复合材料性能的影响.结果表明,在热压扩散相变过程中,随热压温度的升高,准晶相中首先产生大量的微畴缺陷,某些方向上原子呈周期性排列,最后,转变为ω Al7Cu2Fe晶体相.热压时间和颗粒体积分数对颗粒的组织结构影响不明显.颗粒中的Cu原子扩散到基体中,结果在纯Al基体中析出θ′和θ Al2Cu相.更多还原

【Abstract】 Microstructural evolution of Al65Cu20Fe15 quasicrystalline particle/Al matrix composite Induced by hotpressing were studied by means of transmission electron microscopy(TEM), electron probe and Xray diffractometer. The experimental results show that many ordered domains were formatted in icosahedral quasicrystals at 550 ℃ of hotpressing and icosahedral quasicrystals transmitted into ωAl7Cu2Fe crystal structure at 650 ℃. The phase transformation behaviour in particles is almost independent on the hotpressing time and the particle volume fraction. In addition, θ′and θAl2Cu precipitated from Al matrix as the result of the diffusion of cu atoms in particle to Al matrix during hotpressing. 更多还原