(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；
2. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 采用光學(xué)顯微鏡(OM)、掃描電鏡(SEM)、透射電鏡(TEM)、X射線衍射和室溫拉伸研究固溶制度對(duì)1933鋁合金自由鍛件組織和力學(xué)性能的影響。結(jié)果表明：由于Al3Zr粒子對(duì)晶界的釘扎作用，在470 ℃以下固溶時(shí)，合金的再結(jié)晶程度很低(＜15%)；隨著固溶溫度升高，再結(jié)晶程度逐漸上升；510 ℃固溶時(shí)，合金的再結(jié)晶程度顯著增大(約為48%)；1933鋁合金鍛件中第二相主要有Al7Cu2Fe相和η相；合金經(jīng)470 ℃固溶60 min后，η相溶解比較充分，此后隨溫度升高或時(shí)間延長(zhǎng)第二相變化不大；合金的最佳固溶制度為470 ℃、60 min，在此條件下合金具有最好的力學(xué)性能。
關(guān)鍵字: 1933鋁合金；固溶；再結(jié)晶；第二相；力學(xué)性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:The effects of solution treatment on microstructures and properties of the aged 1933 aluminum alloy forgings were investigate by optical microscopy (OM), scanning electron microscopy (SEM), transmission electrical microscopy (TEM), X-ray diffractometry and tensile testing. The results show that the recrystallization fraction is very low (＜15%) when the temperature is below 470 ℃ due to the pinning effect on grain boundaries of Al3Zr dispersoids. When the forgings are treated at 510 ℃, the recrystallization fraction increases significantly to about 48%. The main phases in this alloy are Al7Cu2Fe and η phases. The second phases don’t change obviously with increasing temperature and time because the η phase is dissolved almost completely after solution treatment at 470 ℃ for 60 min. The best solution treatment for 1933 alloy forgings is 470 ℃, 60 min, and the alloys under these conditions have the best tensile properties.
Key words: 1933 aluminum alloy; solution treatment; recrystallization; second phases; mechanical properties
