(1. 中南大学 材料科学与工程学院，长沙 410083；2. 东北轻合金有限责任公司，哈尔滨 150060)
摘 要: 采用半连续铸锭冶金法制备一种成分为Al-6Mg-0.4(Sc+Zr)的合金，冷轧板材经不同温度稳定化退火处理1 h， 然后测试合金的拉伸力学性能，借助光学金相、扫描电镜、能谱仪以及透射电镜分析研究不同退火温度下Al-6Mg-0.4(Sc+Zr)合金的显微组织结构变化及微区成分。结果表明：合金抗拉强度和屈服强度随退火温度的升高而降低，而其伸长率随退火温度的升高而增大；合金在退火过程中, 随退火温度的升高，依次发生不同程度的回复和部分再结晶；300 ℃以下退火1 h，合金中只发生不同程度的回复；350~500 ℃退火1 h，发生部分再结 晶；合金在300 ℃退火处理1 h后拉伸力学性能为：σb 423 MPa，σ0.2 311 MPa，δ 20.8%。
关键字: Al-Mg合金；Sc；Zr；退火温度；显微组织；力学性能
（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
