(1. 中南大學 材料科學與工程學院，長沙 410083；2. 東北輕合金有限責任公司，哈爾濱 150060)
摘 要: 采用半連續(xù)鑄錠冶金法制備一種成分為Al-6Mg-0.4(Sc+Zr)的合金，冷軋板材經(jīng)不同溫度穩(wěn)定化退火處理1 h， 然后測試合金的拉伸力學性能，借助光學金相、掃描電鏡、能譜儀以及透射電鏡分析研究不同退火溫度下Al-6Mg-0.4(Sc+Zr)合金的顯微組織結(jié)構(gòu)變化及微區(qū)成分。結(jié)果表明：合金抗拉強度和屈服強度隨退火溫度的升高而降低，而其伸長率隨退火溫度的升高而增大；合金在退火過程中, 隨退火溫度的升高，依次發(fā)生不同程度的回復和部分再結(jié)晶；300 ℃以下退火1 h，合金中只發(fā)生不同程度的回復；350~500 ℃退火1 h，發(fā)生部分再結(jié) 晶；合金在300 ℃退火處理1 h后拉伸力學性能為：σb 423 MPa，σ0.2 311 MPa，δ 20.8%。
關(guān)鍵字: Al-Mg合金；Sc；Zr；退火溫度；顯微組織；力學性能
（1. School of Material Science and Engineering, Central South University, Changsha 410083, China;2. Northeast Light Alloy Co. LTD, Harbin 150060, China）
Abstract:Abstract: An Al-6Mg-0.4(Sc+Zr) alloy was prepared using semi-continuous casting. The cold-rolling boards were annealed at various temperatures for 1 h. The influence of annealing temperature on the microstructure and mechanical properties of the Al-6Mg-0.4(Sc+Zr) alloys was studied by tensile properties measurement, optical microscope, scanning electron microscope, energy spectrometer and transmission electron microscope. The results show that tensile strength and yield strength of the prepared alloy decrease, while the elongation increases with increasing the temperature. Partial recovery and recrystallization orderly occur with the increase of annealing temperature during stabilizing treatment. The optimum application values of σb, σ0.2 and δ are 423 MPa, 311 MPa and 20.8%, respectively for the cold rolling and stabilizing treatment at 300 ℃ for 1 h.
Key words: Al-Mg alloy; Sc; Zr; annealing temperature; microstructure; mechanical property
