Key Laboratory of the ministry of education of Non ferrous Metal Material Science and Engineering

Changsha, China

Key Laboratory of the ministry of education of Non ferrous Metal Material Science and Engineering

Changsha, China

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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.

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