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《Chinese Journal of Rare Metals》 2011-01
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Effect of Aging on Microstructure and Tensile Properties of Ti-6Cr-5Mo-5V-4Al Alloy

Li Chenglin1,Hui Songxiao1,Ye Wenjun1,Wang Weiqi2,Yang Yulan2,Zhang Pinghui2(1.State Key Laboratory for Fabrication & Processing of Non-Ferrous Metals,General Research Institute for Non-Ferrous Metals,Beijing 100088,China;2.Baoti Group Ltd.,Baoji 721014,China)  
Effect of aging on microstructure and tensile properties of a new type Ti-6Cr-5Mo-5V-4Al Alloy was studied.The experimental results showed that the typical microstructure of Ti-6Cr-5Mo-5V-4Al alloy with α/β solution and aging treatment was broken β grains,continuous and discontinuous necklace-like primary α phase at the β grain boundary,discontinuous spherical primary α phase in the intragranular,and small crossing secondary α phase precipitated during the aging treatment.And the typical microstructure of Ti-6Cr-5Mo-5V-4Al alloy with β solution and aging treatment was equiaxed β grain and secondary α phase precipitated at the equiaxed β grain boundary with a certain orientation,and small crossing secondary α phase homogeneous distributed in the intragranular.Ti-6Cr-5Mo-5V-4Al alloy dissolved in the β area and aging treatment,would be helpful to reinforce alloys when aging at temperature higher than 500 ℃ for a long time,or aging at lower than 500 ℃ for a short time.When dissolved in the α/β area and aging treatment,it would be useful to reinforce alloy aged at temperature lower than 500 ℃ for a short time;aging at temperature higher than 500 ℃ or for a long time would reduce the strength of the alloy,and also,there was is a good strength and plastic match for the alloy in a quite wide range of aging temperature.Ti-6Cr-5Mo-5V-4Al alloy,when aged at temperature lower than 500 ℃,the strength and plastic matched with α/β solution and aging was much better than that with β solution and aging,and when aged at temperature higher than 500 ℃,the results might be inverse.In addition,the short time direct aging treatment could rapidly increase the strength of the alloys,meanwhile,maintaining excellent ductility,such as the alloy directly aged at 500 ℃/ 2h,strength reached to 1590 MPa,while the elongation maintained 6.5%.
【Fund】: 国家科技支持计划(2008BAE60B03)资助
【CateGory Index】: TG156.92
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