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Zhang X.,Central South University | Zhang X.,Key Laboratory of the ministry of education of Non ferrous Metal Material Science and Engineering | Ouyang H.,Central South University | Ouyang H.,Key Laboratory of the ministry of education of Non ferrous Metal Material Science and Engineering | And 8 more authors.
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | Year: 2013

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°C/8 h+475°C/2 h treatment sample is higher than that of samples of 475°C/2 h treatment. The quenched depth is about 65 mm, while that of samples of 475°C/2 h treatment is more than 100 mm. There is few effects of solution treatment on the degree of supersaturation, While comparing to 475°C/2 h single-solution sample, the number of recrystallization grains and subgrains of 450°C/8 h+475°C/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. Source

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