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| Influence of Solution Treatment on the Quench Sensitivity of Al-7.9Zn-2.5Mg-1.0Cu Alloy |
ZHANG Xinming1,2** OUYANG Hui1,2 LIU Shengdan1,2 WU Zezheng1,2
WANG Lei1,2 ZHOU Zhile1,2 |
1. School of Materials Science and Engineering, Central South University, Changsha 410083;
2. Key Laboratory of the ministry of education of Non-ferrous Metal Material Science and Engineering,
Changsha 410083 |
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Cite this article:
ZHANG Xinming, OUYANG Hui, LIU Shengdan, WU Zezheng,
WANG Lei, ZHOU Zhile. Influence of Solution Treatment on the Quench Sensitivity of Al-7.9Zn-2.5Mg-1.0Cu Alloy. Chinese Journal of Materials Research, 2013, 27(2): 119-125.
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Abstract The influence of solution treatment on the quench sensitivity of Al-7.9Zn-2.5Mg-1.0Cu alloy during quenching was investigated by optical microscopy(OM), differential scanning calorimetry(DSC), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and end quenching-hardness measurement. The results show that the hardness of different solution treatment samples decreases with the distance from quenching end increase. Moreover, the quench sensitivity of 450 ℃/8 h+475 ℃/2 h treatment sample is higher than that of samples of 475 ℃/2 h treatment. The quenched depth is about 65mm, while that of samples of 475 ℃/2 h treatment is more than 100mm. There is few effects of solution treatment on the degree of supersaturation, While comparing to 475 ℃/2 h single-solution sample, the number of recrystallization grains and subgrains of 450 ℃/8 h+475 ℃/2 h double-solution sample increase, which facilitated separation of more coarse η equilibrium particles in the samples of, and lead to higher quench sensitivity.
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