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J. Cent. South Univ. Technol. (2011) 18: 279-284 DOI: 10.1007/s11771-011-0691-9 Microstructure and mechanical properties of Al-Zn-Cu-Mg-Sc-Zr alloy after retrogression and re-aging treatments LI... was evaluated by tensile test, hardness test and conductivity measurement. The results show that for the alloys with retrogression and re-aging treatment (RRA), the conductivity increases......
Retrogression and re-aging treatment of Al-9.99%Zn-1.72%Cu-2.5%Mg-0.13%Zr aluminum alloy FENG Chun(冯 春)1, LIU Zhi-yi(刘志义)1, NING Ai-lin(宁爱林)1,2, LIU Yan-bin(刘延斌)1, ZENG Su-min(曾苏民)1 1. School... September 2005; accepted 6 January 2006 Abstract: The effect of retrogression and re-aging(RRA) heat treatment on the microstructure and mechanical properties of a low frequency electromagnetic casting......
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heating rate significantly affects the microstructures and mechanical properties of the alloys treated by retrogression and re-aging (RRA) process, and it is found that the medium rate (57 ℃/min) leads... and discontinuous η phases. Key words: aluminum alloy 7050; retrogression and re-aging treatment; microstructure; mechanical propertie 1 Introduction 7000-series high strength aluminum......
:A 文章编号:1672-7207(2012)07-2520-08 Influence of retrogression and re-aging treatment on intergranular and exfoliation corrosion of 1973 aluminum alloy GONG... of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China) Abstract: The influence of retrogression and re-aging treatment (RRA......
; 文章编号:1672-7207(2016)08-2600-08 Effect of re-aging on mechanical and corrosion properties of over-aging 7B50 alloy LIU Wei, CHEN Kanghua, CHEN Songyi, DONG Pengxuan, SUN Qingqing (State Key Laboratory of Powder Metallurgy, Center South University, Changsha 410083, China) Abstract: The effects of re-aging on the microstructure and mechanical properties of two-step over-aging 7B50 alloy......
. Therefore, the EC resistance is the order of RRA 4 Discussion It is well acknowledged [7] that the main microstructural changes during retrogression and re-aging are the partial dissolution of GP zones and fine η′ precipitates in the matrix and re-precipitated during the re-aging, while η(MgZn2) precipitates at the grain boundaries are allowed to form and coarse. Therefore, it can be speculated......
), the supersaturated solid solution as retrogression contains high vacancy concentration which is beneficial to re-aging. So, there are wider precipitate free zones (PFZ) and coarser discontinuous precipitates at grain boundaries in the re-aging microstructure. However, slow cooling at the rates of 3 ℃/s and 0.02 ℃/s, some of fine particles of the second phase precipitate gradually on grain boundaries......
of 2195 Al-Li alloy as function of T8 re-aging time at different temperatures 2.2 显微组织 图2所示分别为原始2195-T8铝锂合金及重固溶处理后纵截面的金相照片,二者纵截面均表现为明显拉长的带状晶粒组织,且重固溶处理后晶粒长大程度很小.由于2195铝锂合金时效温度(152 ℃)远低于其固溶温度(505~510... 145 ℃时效不同时间的衍射斑及TEM暗场像 Fig. 4 Dark field TEM images of 2195 Al-Li alloy after re-solution followed by T8 re-aging at 145 ℃ for different time ((a), (c), (e) T1 precipitate, b=<112>; (b......
of the re-aged Cu-Ni-Si alloy are discussed. The results indicate that the pre-aging process for Cu-Ni-Si alloy was responsible to the significant strengthening effect in re-aging process, and the re... of pre-aging and deformed Cu-Ni-Si alloy. On the formation and growth of recrystallization, the precipitated phases are coarsed or dissolved in the front of grain boundaries following a re......