Study of Ageing Treatment on Spray Forming Al-Zn-Mg-Cu Alloy

Abstract:

The Al-Zn-Mg-Cu (7A04) alloys were prepared by using the method of spraying forming and the hot extrusion. The changes of microstructure and mechanical properties of the spray deposited Al-Zn-Mg-Cu alloy underwent ageing, regression and reageing treatment (RRA) was studied by scanning electron microscopy, X-ray diffraction and other methods. The results show that the tensile strength of the alloy aged at 120°C for 24 hours can reach the peak value (760MPa), but the elongation is only 4.8 percent. The toughness of the alloy regression treated at 160°C for 2 hours can increase to 9.0 percent, but its tensile strength decreases greatly (680MPa). The reaging treatment at 120°C can make the tensile strength up to 740MPa, while the elongation which is 8.2 percent still keeps a higher level.

• Periodical: Applied Mechanics and Materials (Volumes 217-219)
• Pages: 1835-1838
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.217-219.1835
• Online since: November 2012
• Authors: Rui Ming Su*, Ying Dong Qu, Run Xia Li, Rong De Li
• Keywords: Al-Zn-Mg-Cu Alloy, Mechanical Property, Microstructure, RRA, Spray Forming

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