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
Tribological characteristics of new series of Al Sn Si alloys were investigated by means of pin disk types of wear testing machines, OM, SEM and EDAX. Rules about the influence of Sn, Si content and load on the fricti...Tribological characteristics of new series of Al Sn Si alloys were investigated by means of pin disk types of wear testing machines, OM, SEM and EDAX. Rules about the influence of Sn, Si content and load on the friction and wear characteristics of the alloys were ascertained. The friction factor and wear rate of the alloys decrease with increasing Sn content, the wear rate decreases but the friction factor varies hardly with increasing Si content. The friction factor of the alloys increases slightly and the wear rate increases observably with increasing load in the range of 1080 N. The wear mechanism of Al Sn Si alloys consists of ‘plough’ action and abrasive wear below 30 N; the adhesive and delamination mechanism are shown in the range of 3080 N. The tribological characteristics of Al Sn Si system are superior to those of Al Sn or Al Si systems due to their “peritectic type” island shape microstructure of Si surrounded with Sn.展开更多
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
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。
文摘Tribological characteristics of new series of Al Sn Si alloys were investigated by means of pin disk types of wear testing machines, OM, SEM and EDAX. Rules about the influence of Sn, Si content and load on the friction and wear characteristics of the alloys were ascertained. The friction factor and wear rate of the alloys decrease with increasing Sn content, the wear rate decreases but the friction factor varies hardly with increasing Si content. The friction factor of the alloys increases slightly and the wear rate increases observably with increasing load in the range of 1080 N. The wear mechanism of Al Sn Si alloys consists of ‘plough’ action and abrasive wear below 30 N; the adhesive and delamination mechanism are shown in the range of 3080 N. The tribological characteristics of Al Sn Si system are superior to those of Al Sn or Al Si systems due to their “peritectic type” island shape microstructure of Si surrounded with Sn.
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。
