Investigation of Quench Sensitivity of an Al-7.5Zn-1.7Mg-1.4Cu-0.12Zr Alloy

Abstract:

In the present work, quench sensitivity of an Al-7.5Zn-1.7Mg-1.4Cu-0.12Zr alloy is investigated by temperature-time-property (TTP) curve and TEM analysis, comparing with traditional AA 7B04 and AA 7150. The results indicate that the nose temperature of TTP curve and the corresponding incubation period of the alloy, AA 7150 and AA 7B04 are about 290°C/4.5s, 320°C/2.6s and 335°C/0.1s, respectively, The nose temperature of the alloy is the lowest among three alloys and the critical time at the nose temperature is the longest for the alloy, which is obvious that the alloy has lower quench sensitivity. Further TEM analysis shows that, with the prolongation of keeping time at the nose temperature, quench-induced precipitation phenomenon becomes obvious.

• Periodical: Materials Science Forum (Volumes 706-709)
• Pages: 431-435
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.706-709.431
• Online since: January 2012
• Authors: Bai Qing Xiong, Xi Wu Li, Yong An Zhang, Zhi Hui Li, Bao Hong Zhu, Feng Wang, Hong Wei Liu
• Keywords: Al-Zn-Mg-Cu Alloy, Precipitate, Quench Sensitivity, TTP Curve

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