(1. 中南大学 材料科学与工程学院，长沙 410083；2. 中南大学 有色金属材料与工程教育部重点实验室，长沙 410083)
摘 要: 采用硬度、电导率、室温拉伸测试、差示扫描量热分析(DSC)、极化曲线及透射电镜(TEM)观察研究预时效温度及回归加热速率对7150铝合金显微组织及性能的影响。结果表明：合金的抗拉强度对预时效温度敏感，耐腐蚀性能对回归加热速率敏感。再时效后合金的抗拉强度随预时效温度的升高而增加，耐腐蚀性能随回归加热速率的提高而降低。经(65 ℃，24 h)+(4.25 ℃/min)(190 ℃，50 min)+(120 ℃，24 h)的三级时效处理后，7150 铝合金的电导率(IACS)大于36%，抗拉强度损失小于峰时效态(T6)合金强度的3%。
关键字: 7150铝合金；回归；预时效温度；力学性能
（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:Hardness, electrical conductivity, room temperature tensile properties testing, differential scanning calorimetry (DSC), polarization curve and transmission electron microscope (TEM) observation were used to investigate the effect of pre-aging temperature and retrogression heating rate on the microstructure and properties of 7150 aluminum alloy. The results reveal that the tensile strength is sensitive to the pre-ageing temperature, while the corrosion resistance is sensitive to the retrogression heating rate. The tensile strength of the re-aging treated alloy increases with the rise of pre-aging temperature, and the corrosion resistance deteriorates with the increase of retrogression heating rate. After (65 ℃, 24 h)+(4.25 ℃/min)(190 ℃, 50 min)+(120 ℃, 24 h) aging treatment，the electrical conductivity (IACS) of the 7150 aluminum alloy exceeds 36%, and the reduction of ultimate strength is less than 3% of the strength of T6 treatment alloy.
Key words: 7150 aluminum alloy; retrogression; pre-aging temperature; mechanical properties
