Measurement of TTP Curves of 7050 Aluminum Alloy by Conductivity

Abstract:

The conductivity of 7050 alloy after isothermal quenched and isothermal quenched then T6 aged was measured by a simple and efficient method of measuring conductivity, its TTP curves fitted by conductivity data and also the isothermal treated microstructure of this alloy studied by the transmission electron microscopy (TEM). At the same time, the TTP curves fitted respectively by hardness and conductivity data of isothermal quenched then T6 aged samples were compared. The results show that it is feasible to fit TTP curves of 7xxx series high strength aluminum alloy by the method of conductivity measurement which can obtain its TTP curves by measuring transient properties of alloy. The nose temperature of the TTP curves of 7050 alloy fitted by conductivity method is about 330°C and at this temperature the incubation period for decomposition and precipitation of supersaturated solid solution is 1.25 s. By isothermal treating at 330°C for 2 s the precipitates in 7050 alloy form mainly by heterogeneous nucleation. It is indicated that for current TTP curves of aluminum alloy fitted by the method of measuring properties, the precipitates corresponding with the TTP curve which represents properties of alloy variations about 0.5% of the target properties are heterogeneous nucleation precipitation.

• Periodical: Advanced Materials Research (Volume 1095)
• Pages: 168-174
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1095.168
• Online since: March 2015
• Authors: Lei Kang, Gang Zhao*, Ni Tian, He Fu
• Keywords: 7050 Aluminum Alloy, Conductivity, Isothermal Quenching, Nose Temperature, TTP Curve

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