Effects of T6 and T6I4 ageing treatments on the dynamic mechanical properties and microstructure evolution of 7N01 aluminum alloy at highStemperature

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Effects of T6 and T6I4 ageing treatments on the dynamic mechanical properties and microstructure evolution of 7N01 aluminum alloy at highStemperature
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Clc Number:TG156
Fund Project:National Natural Science Foundation of China (51301211, 21271188); the Foundation of Laboratory of Ultra Precision Manufacturing Technology of CAEP (ZZ13005); Research Foundation of CAEP (2010A0302013); the China Postdoctoral Science Foundation (2012M521541); the State Key Laboratory of Powder Metallurgy (20110933K); the Open-End Fund for Valuable and Precision Instruments of Central South University (CSU2013016)

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Abstract:

The effects of T6 and T6I4 aging treatments on dynamic mechanical properties and microstructure evolution of 7N01 aluminum alloy at high temperatures were investigated by using the split Hopkinson pressure bar(SHPB), Optical Microscopy(OM) and Transmission Electron Microscopy(TEM). The results show that the dynamic yield stresses of T6I4 and T6 aging state 7N01 aluminum alloy increase with the increasing strain rate. The dynamic yield stress and dislocation density descend with the increasing temperature. The dynamic yield stress of 7N01-T6I4 aluminum alloy is higher than that of 7N01-T6 aluminum alloy at 150℃ and 250℃. At 350℃, the precipitates in 7N01-T6I4 aluminum alloy is dissolved, while the precipitates in 7N01-T6 aluminum alloy is coarsened. As a result, the dynamic yield stress of 7N01-T6I4 aluminum alloy is lower than that of 7N01-T6 aluminum alloy.

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[liuwenhui. Effects of T6 and T6I4 ageing treatments on the dynamic mechanical properties and microstructure evolution of 7N01 aluminum alloy at highStemperature[J]. Rare Metal Materials and Engineering,2018,47(1):311~316.]
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Received:November 30,2015
Revised:March 10,2016
Adopted:March 29,2016
Online: February 07,2018
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