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%。
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 rain）＋（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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2013年第5期1173-1181,共9页
The Chinese Journal of Nonferrous Metals
基金
国家重点基础研究发展计划项目(2012CB619505)
关键词
7150铝合金
回归
预时效温度
力学性能
7150 aluminum alloy
retrogression
pre-aging temperature
mechanical properties
