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

来源期刊:中国有色金属学报2013年第5期

论文作者:冯 迪 张新明 刘胜胆 陈 祺

文章页码:1173 - 1182

关键词:7150铝合金;回归;预时效温度;力学性能

Key words:7150 aluminum alloy; retrogression; pre-aging temperature; mechanical properties

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%。

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.

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