放电等离子烧结制备Al-Zn-Mg-Cu纳米晶合金的组织  

Microstructure of a bulk nanocrystalline Al-Zn-Mg-Cu alloy prepared by cryomilling and spark plasma sintering

作　　者：陈汉宾[1] 程军胜[1] 杨滨[1,2] 张济山[1] 樊建中[3] 田晓风[3] 

机构地区：[1]北京科技大学新金属材料国家重点实验室 [2]中国科学院国际材料物理中心,沈阳110016 [3]北京有色金属研究总院

出　　处：《北京科技大学学报》2007年第3期293-297,共5页Journal of University of Science and Technology Beijing

基　　金：国家"863"纳米专项课题(No.2002AA302502)

摘　　要：利用低温液氮球磨和放电等离子烧结工艺制备了块体纳米晶Al—Zn—Mg—Cu合金．采用X射线衍射（XRD）技术分析了材料的晶粒尺寸和微观应变，利用透射电镜（TEM）研究了合金微观组织的演变．结果表明：采用放电等离子烧结法制备的7000系纳米铝合金具有两种不同的纳米晶结构，以晶粒尺寸50-100nm的等轴晶为主，少量200-400nm的大晶粒为辅；烧结过程中发生再结晶及第二相析出，析出的第二相以η（MgZn2）为主，θ（Al2Cu）以及S（Al2CuMg）为辅．A bulk nanocrystalline Al-Zn-Mg-Cu alloy was produced by cryomilling and spark plasma sintering. The grain size, the microstrain, phase transformation and microstructure of this alloy were investigated by X-ray diffraction （XRD） and transmission electron microscopy （TEM）. The results show that the bulk nanocrystalline 7000 aluminum alloy prepared by spark plasma sintering has two types of distinctive nanostructures- primarily equiaxed grains with diameters of 50 - 100 nm, and a few of larger grains with diameters of 200- 400 nm. The precipitate of second phases, mainly including η （MgZn2） and a few θ （Al2Cu） and S（Al2CuMg）, and recrystallization of the bulk nanocrystalline 7000 aluminum alloy were found during the consolidation process by SPS

关 键 词：铝合金 低温球磨 放电等离子烧结 微观组织 

分 类 号：TG135.1[一般工业技术—材料科学与工程] TG115.22[金属学及工艺—合金]