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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
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)