(上海大學(xué) 材料科學(xué)與工程學(xué)院，上海 200072)
摘 要: 采用透射電鏡及三維原子探針研究元素Cu對6082Al-Mg-Si合金170 ℃時效初期GP區(qū)的影響。研究結(jié)果表明：添加元素Cu的Al-Mg-Si合金經(jīng)170 ℃時效30 min后在合金中形成了大量由Mg、Si和Cu 3種元素組成的GP區(qū)，元素Cu的存在促進(jìn)了合金時效初期GP區(qū)的形成，但并沒有改變GP區(qū)中Mg和Si的摩爾比，Cu原子存在的GP區(qū)中Mg和Si的摩爾比仍然接近1。添加元素Cu的合金經(jīng)170 ℃時效30 min后，合金中還出現(xiàn)短針狀的預(yù)β″相。
關(guān)鍵字: Cu；Al-Mg-Si合金；GP區(qū)；三維原子探針；析出相
6082 Al-Mg-Si alloy aged
（School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China）
Abstract:The effect of Cu addition on the GP zones of 6082Al-Mg-Si alloy during the early stage of ageing at 170℃ was investigated by transmission electron microscope(TEM) and three-dimensional atom probe (3DAP). The results show a great deal of GP zones including Mg, Si and Cu atoms form in the alloy with 0.6%Cu, which is aged at 170 ℃ for 30 min. The addition of Cu accelerates the forming of GP zones, but it does not change the mole ratio of Mg and Si in GP zone and the mole ratio of the GP zones is still close to 1. The shot needle-shaped pre-β″ precipitation appears in the alloy after Cu is aged at 170 ℃ for 30 min.
Key words: Cu; Al-Mg-Si alloy; GP zone; three-dimensional atom probe; precipitation phase
