MECHANICAL PROPERTIES OF SUPER–HIGH STRENGTH Al ALLOY 7A04 AT TRANSIENT HEATING
WU Dafang, PAN Bing, WANG Yuewu, ZHAO Shougen, YANG Hongyuan, HUANG Liang
School of Aeronautical Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100191
Cite this article:
WU Dafang PAN Bing WANG Yuewu ZHAO Shougen YANG Hongyuan HUANG Liang. MECHANICAL PROPERTIES OF SUPER–HIGH STRENGTH Al ALLOY 7A04 AT TRANSIENT HEATING. Acta Metall Sin, 2011, 47(6): 757-762.
Abstract Super–hard aluminum alloy 7A04 (Al–Zn–Mg–Cu), whose ultimate strength is higher than that of duralumin, belongs to a class of aluminum alloys with highest ultimate strength tested at room temperature. As it can be utilized as structural material of various heating components such as rocket liquid storage tank and missile wing, super–hard aluminum alloy 7A04 has been widely used in the field of aerospace engineering. However, the ultimate strength and other token mechanical parameters of aluminum alloy 7A04 at transient high–temperature heating environment are still unclear to us, as these key mechanical parameters are lacking in existing strength design handbook. Experimental characterization of these critical parameters of aluminum alloy 7A04 is undoubtedly meaningful to the reliability estimation, life prediction and security design of the high–speed flight vehicle. In this paper, by combining transient aerodynamic heating simulation system and material testing machine, the high–temperature ultimate strength, loading time and oher mechanical properties of super–hard aluminum alloy 7A04 undedifferent transient heating temperature and loading conditions were investigated Experimental results revealed that the ultimate strength and loading capability of aluminum alloy 7A04 subjected to transient thermal heating were much higher than those teted in a long–time stable high–temperature environmen. The results provided substantial basis fr the loading capability improvement nd optmal design of erospace materials and stuctures subject to transient heating.
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