高能球磨制备Al-Pb-Si-Sn-Cu纳米晶粉末的特性  

Synthesized by Ball Milling Al-Pb-Si-Sn-Cu Nanocrystalline Powder

作　　者：冉广[1] 周敬恩[1] 李鹏亮[1] 席生岐[1] 张中武[1] 

机构地区：[1]西安交通大学,陕西西安710049

出　　处：《稀有金属材料与工程》2004年第12期1312-1316,共5页Rare Metal Materials and Engineering

摘　　要：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。The nanocrystalline powder of Al-15%Pb-4%Si-1%Sn-1.5%Cu (mass%) were prepared by mechanical alloying. Systematical investigations were carried out on the structural change, grain size, lattice constant, morphology of the powder and the chemical composition of the Al-15%Pb-4%Si-1%Sn-1.5%Cu high energy ball milled powder using X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The experimental results showed that the nanocrystalline powders were synthesized and the homogenous nanophases was achieved by mechanical alloying. The effect of ball milling was more evident to lead than to aluminum. The grain size of Pb was 40 nm after milling for 40 h, and the grain size of aluminum was 65 nm after milling for 60 h. The solid solutions of Al(Cu, Si) and Pb(Sn), and supersaturated solid solution of Pb(Al) were observed by MA. Otherwise, brittle element powder of silicon was more difficulty alloying in the mechanical alloying process.

关 键 词：机械合金化 Al—Pb—Si—Sn—Cu合金 轴瓦合金 纳米晶材料 

分 类 号：TB383[一般工业技术—材料科学与工程]