(1. 北京科技大學(xué) 新金屬材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，北京 100083;
2. 北京有色金屬研究總院，北京 100088)
摘 要: 利用液氮球磨、真空熱壓和擠壓工藝制備塊體納米晶Al-Zn-Mg-Cu合金，并對(duì)其固溶和時(shí)效處理進(jìn)行研究，得到時(shí)效硬度曲線。利用X射線衍射儀和透射電鏡對(duì)該合金熱處理前后的微觀組織進(jìn)行分析，結(jié)果表明：塊體制備過(guò)程中析出的MgZn2可以通過(guò)固溶處理使其回溶并在時(shí)效后沉淀析出；熱壓后晶粒尺寸為50~100 nm，熱處理后晶粒長(zhǎng)大到100 nm，部分晶粒達(dá)到200 nm。
關(guān)鍵字: 鋁合金；塊體納米晶；低溫球磨；固溶處理；時(shí)效處理；微觀組織
FAN Jian-zhong2, TIAN Xiao-feng2
（1. State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing, Beijing 100083, China;
2. Beijing General Research Institute for Nonferrous Metals,Beijing 100088, China）
Abstract: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.
Key words: aluminum alloy; bulk nanocrystalline; cryomilling; solid-solution; aging; microstructure
