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《Journal of Central South University of Technology(Natural Science)》 2000-06
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The effect of promotively-solutionizing treatment on the mechanical properties and fracture of ultra high strength 7055 aluminum alloys

CHEN Kang hua,LIU Hong wei,LIU Yun zhong (State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China) [  
The remaining constitute particles deteriorate the comprehensive properties of high strength aluminum alloys. The effects of promotively solutionizing of soluble remaining constituent phases on the microstructure and mechanical properties of 7055 alloys were studied. The results show that the temperature incremental solutionizing heat treatment can make the solutionizing temperature limit higher than the multi phase eutectic temperature without the formation of overheated structure and effectively promote the solutionizing and improve the mechanical properties of 7055 alloys. By promotively solutionizing, the yield strength and ultimate tensile strength of 7055 alloy can rise to 715 MPa and 750 MPa respectively, remaining about 10% elongation. Zr addition is more beneficial to the strength of 7055 alloy than Cr. Fractography demonstrates that the fracture of 7055 alloys is in transgranular/intergranular mixed mode. By promotively solutionizing, the transgranular dimpled rupture initiated from remaining constituents decreases , and intergranular rupture increases. [
【Fund】: 国家重点基础研究发展规划项目!(G19990 6 490 0 );; 高等学校骨干教师计划基金资助项目! (教技司 [2 0 0 0 ] 6 5 )
【CateGory Index】: TG14
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