通过机械合金化制备了 Al-15%Pb-4%Si-1%Sn-1.5%Cu(质量分数)纳米晶粉末。采用 X 射线衍射(XRD),扫描电镜(SEM)和透射电镜(TEM)对不同球磨时间的混合粉末的组织结构、晶粒大小、微观形貌以及颗粒中化学成分分布情况进行了研究。结果表...通过机械合金化制备了 Al-15%Pb-4%Si-1%Sn-1.5%Cu(质量分数)纳米晶粉末。采用 X 射线衍射(XRD),扫描电镜(SEM)和透射电镜(TEM)对不同球磨时间的混合粉末的组织结构、晶粒大小、微观形貌以及颗粒中化学成分分布情况进行了研究。结果表明混合粉末经过球磨后形成了纳米晶,其组织非常均匀。球磨对 Pb 的作用效果明显大于对 Al 的作用效果,经过 40 h 球磨后 Pb 粒子达到 40 nm,而 Al 在球磨 60 h 后晶粒为 65 nm;经球磨后,Cu 和 Si 固溶于 Al 的晶格中,而 Sn 则固溶于 Pb 晶格中,并且 Al 和 Pb 发生了互溶,形成了 Pb(Al)超饱和固溶体;在球磨过程中硬度高的脆性粒子 Si 难于完全实现合金化。展开更多
选择Al Sn Si Cu Mg合金作为研究对象,采用Leica光学显微镜、EPM810Q电子显微镜等手段观察分析Cu、Mg、Sn、Si形态分布规律,进而研究了加工工艺对合金组织性能的影响,同时提出高温短时退火制度,最终确定预处理工艺和退火制度,发现通过...选择Al Sn Si Cu Mg合金作为研究对象,采用Leica光学显微镜、EPM810Q电子显微镜等手段观察分析Cu、Mg、Sn、Si形态分布规律,进而研究了加工工艺对合金组织性能的影响,同时提出高温短时退火制度,最终确定预处理工艺和退火制度,发现通过加工和热处理,可消除合金中Sn、Si晶间网状分布,从而改善合金的加工性能。展开更多
The strength and fatigue fracture behavior of A1-Zn-Mg-Cu-Zr(-Sn) alloys were studied by performing tensile tests and fatigue crack propagation (FCP) tests. The microstructures of the experimental alloys were furt...The strength and fatigue fracture behavior of A1-Zn-Mg-Cu-Zr(-Sn) alloys were studied by performing tensile tests and fatigue crack propagation (FCP) tests. The microstructures of the experimental alloys were further analyzed using optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM); phase analysis of these alloys was conducted with an X-ray diffraction (XRD). The results show that when Sn is included, growth of the recrystallization grains in the solution-treated A1-Zn-Mg-Cu-Zr alloy is obstructed, the precipitation-free zone (PFZ) of the overaged A1-Zn-Mg-Cu-Zr-Sn alloy becomes narrow, and the grain boundary precipitates are smaller. Consequently, the FCP resistance is higher. In addition, the overaged Sn-containing alloy has considerably higher tensile strength than the alloy without Sn.展开更多
文摘通过机械合金化制备了 Al-15%Pb-4%Si-1%Sn-1.5%Cu(质量分数)纳米晶粉末。采用 X 射线衍射(XRD),扫描电镜(SEM)和透射电镜(TEM)对不同球磨时间的混合粉末的组织结构、晶粒大小、微观形貌以及颗粒中化学成分分布情况进行了研究。结果表明混合粉末经过球磨后形成了纳米晶,其组织非常均匀。球磨对 Pb 的作用效果明显大于对 Al 的作用效果,经过 40 h 球磨后 Pb 粒子达到 40 nm,而 Al 在球磨 60 h 后晶粒为 65 nm;经球磨后,Cu 和 Si 固溶于 Al 的晶格中,而 Sn 则固溶于 Pb 晶格中,并且 Al 和 Pb 发生了互溶,形成了 Pb(Al)超饱和固溶体;在球磨过程中硬度高的脆性粒子 Si 难于完全实现合金化。
文摘选择Al Sn Si Cu Mg合金作为研究对象,采用Leica光学显微镜、EPM810Q电子显微镜等手段观察分析Cu、Mg、Sn、Si形态分布规律,进而研究了加工工艺对合金组织性能的影响,同时提出高温短时退火制度,最终确定预处理工艺和退火制度,发现通过加工和热处理,可消除合金中Sn、Si晶间网状分布,从而改善合金的加工性能。
基金Project(2010CB731706) supported by the National Basic Research Program of China
文摘The strength and fatigue fracture behavior of A1-Zn-Mg-Cu-Zr(-Sn) alloys were studied by performing tensile tests and fatigue crack propagation (FCP) tests. The microstructures of the experimental alloys were further analyzed using optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM); phase analysis of these alloys was conducted with an X-ray diffraction (XRD). The results show that when Sn is included, growth of the recrystallization grains in the solution-treated A1-Zn-Mg-Cu-Zr alloy is obstructed, the precipitation-free zone (PFZ) of the overaged A1-Zn-Mg-Cu-Zr-Sn alloy becomes narrow, and the grain boundary precipitates are smaller. Consequently, the FCP resistance is higher. In addition, the overaged Sn-containing alloy has considerably higher tensile strength than the alloy without Sn.