块体纳米晶Al-Zn-Mg-Cu合金的热处理  

Heat treatment of bulk nanocrystalline Al-Zn-Mg-Cu alloy

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

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]北京有色金属研究总院,北京100088

出　　处：《中国有色金属学报》2007年第1期30-34,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目(2002AA302502)

摘　　要：利用液氮球磨、真空热压和挤压工艺制备块体纳米晶Al-Zn-Mg-Cu合金，并对其固溶和时效处理进行研究，得到时效硬度曲线。利用X射线衍射仪和透射电镜对该合金热处理前后的微观组织进行分析，结果表明：块体制备过程中析出的MgZn2可以通过固溶处理使其回溶并在时效后沉淀析出；热压后晶粒尺寸为50～100nm，热处理后晶粒长大到100nm，部分晶粒达到200nm。Bulk nanocrystalline Al-Zn-Mg-Cu alloy was fabricated by cryomilling combined with vacuum hot pressing and extrusion. The aging-curve was obtained. The crystal structures and microstructures before and after heat treatment were investigated by X-ray diffractometry （XRD） and transmission electron microscopy（TEM）, respectively. The results show that the deposition（MgZn2） of consolidation can be dissolved again by solid-solution, and precipitated during aging. The grain sizes of the bulk nanocrystalline Al-Zn-Mg-Cu alloy produced by vacuum hot pressing are 50-100 nm, some of them grow to 100 nm even part of them reach 200 nm after heat-treatment.

关 键 词：铝合金 块体纳米晶 低温球磨 固溶处理 时效处理 微观组织 

分 类 号：TG156[金属学及工艺—热处理]