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《Rare Metal Materials and Engineering》 2007-09
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Effects of Aging Treatment on the Microstructures and Slow Strain Tensile Properties of 7000 Series Ultra-High Strength Aluminum Alloy

Li Hai1,2, Wang Zhixiu1, Zheng Ziqiao2 (1. Jiangsu Polytechnic University, Changzhou 213016, China ) (2. Central South University, Changsha 410083, China )  
Mechanical properties and stress corrosion resistances of Al-9.88Zn-2.40Mg-2.32Cu-0.12Zr ultra-high strength aluminum have been measured by conventional and slow strain rate tensile tests in different aging conditions of T6, RRA and T73. The fracture morphology and precipitates by low strain tensile were observed with SEM and TEM, respectively. The results show that the precipitates are GP+η’ phase, η’ phase+η’phase, and η phase for the aging conditions of T6, RRA and T73, respectively. The precipitates size inside grains and on the grain boundary and the width of PFZ on the grain boundary increase in turn, and the distribution of precipitates on the grain boundary alters from continuously needle-shaped to discontinuously globular. These microstructural characteristics endow the new alloys by different aging conditions with different stress corrosion resistances, mechanical properties and fracture morphologies.
【Fund】: 国家“863”项目(2001AA332030)
【CateGory Index】: TG113.2
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