(中南工業(yè)大學(xué)材料科學(xué)與工程系，長沙，410083)
摘 要: 配制了2618及2618+Sc+Zr兩種不同成分的合金，采用硬度測試初步研究了微量Sc和Zr對2618 合金冷軋板材退火后再結(jié)晶行為的影響，并采用金相顯微鏡和透射電鏡觀察了合金不同狀態(tài)下的顯微組織結(jié)構(gòu)。結(jié)果表明：加入Sc和Zr后生成的Al3(Sc,Zr)質(zhì)點細小彌散，與基體共格，可釘扎位錯，穩(wěn)定亞結(jié)構(gòu)，阻礙亞晶長大及晶界的遷移，從而抑制合金的再結(jié)晶，使含Sc和Zr的合金再結(jié)晶溫度比參比的2618合金的再結(jié)晶溫度提高約200℃；亞晶聚合機制對合金的再結(jié)晶發(fā)揮了作用。
關(guān)鍵字: Al-Cu-Mg-Fe-Ni合金；再結(jié)晶；鈧；鋯
（Department of Materials Science and Engineering,
Central South University of Technology, Changsha 410083, P.R.China）
Abstract:The influence of trace Sc and Zr addition on the recrystallization behavior of cold-rolled 2618 alloy has been investigated by Vicker's hardness measurement. The microstructures of the alloys were observed by using optical microscope and transmission electron microscopy (TEM). The results show that the dispersed Al3(Sc,Zr) phase can strongly pin dislocations, stabilize substructures and impede the movement of boundaries. So the recrystallization of the alloys is retarded and the temperature of recrystallization of 2618+Sc+Zr alloy is about 200 ℃ higher than that of controlled 2618 alloy. The subgrain coalescence nucleation mechanism is involved in the recrystallization process.
Key words: Al-Cu-Mg-Fe-Ni alloy; recrystallization; scandium; zirconium
