车用Al-Cu-Mg合金组织演变的时效过程调节方法分析
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摘要
为了改善Al-Cu-Mg铝合金在时效过程组织的演变,探讨了空位调节、外应力/应变调节以及多级时效调节技术。结果表明:空位调节产生的位错环促进了Cu与Mg原子的扩散过程并生成S相;外应力/应变调节后,合金中的析出颗粒变得更加细小,并且当应变量或应变速率增加后,合金的时效析出过程变得更加容易;多级时效调节能够有效改善合金强度及其抗应力腐蚀性能。
In order to improve the microstructure evolution of Al-Cu-Mg aluminum alloy during aging, the techniques of vacancy adjustment, external stress/strain adjustment and multistage aging adjustment were discussed. The results show that,the dislocation ring produced by vacancy regulation promotes the diffusion of Cu and Mg atoms and generates S phase. After the stress/strain adjustment, the precipitated particles in the alloy become smaller, and with the strain or strain rate increasing,the aging precipitation process of the alloy becomes easier. The multistage aging adjustment can effectively improve the strength and stress corrosion resistance of the alloy.
In order to improve the microstructure evolution of Al-Cu-Mg aluminum alloy during aging, the techniques of vacancy adjustment, external stress/strain adjustment and multistage aging adjustment were discussed. The results show that,the dislocation ring produced by vacancy regulation promotes the diffusion of Cu and Mg atoms and generates S phase. After the stress/strain adjustment, the precipitated particles in the alloy become smaller, and with the strain or strain rate increasing,the aging precipitation process of the alloy becomes easier. The multistage aging adjustment can effectively improve the strength and stress corrosion resistance of the alloy.
引文
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[2]Wang S C,Starink M J.The assessment of GPB2/S''structures in Al-Cu-Mg alloys[J].Mater Sci.Eng.A,2004,386(1/2):156-163.
[3]Ralston K D,Birbilis N,Weyland M,et al.The effect of precipitate size on the yield strength-pitting corrosion correlation in Al-Cu-Mg alloys[J].Acta Mater,2010,58(18):5941-5948.
[4]Buha J,Lumley R N,Crosky A G.Secondary ageing in an aluminum alloy 7050[J].Mater Sci.Eng.A,2008,492(12):1-10.
[5]Marioara C D,Lefebvre W,Andersen S,et al.Atomic structure of hardening precipitates in an Al-Mg-Zn-Cu alloy determined by HAADF-STEM and first-principles calculations:relation toη-Mg Zn2[J].J Mater Sci.,2013,48(10):3638-3651.
[6]Marceau R K W,Sha G,Lumley R N,et al.Evolution of solute clustering in Al-Cu-Mg alloys during secondary aging[J].Acta Mater,2010,58(5):1795-1805.
[7]Eto T,Sato A,Mori T.Stress-oriented precipitation of G.P.Zones andθ'in an Al-Cu alloy[J].Acta Metallurgica,1987,26(3):499-508.
[8]Deschamps A,Bley F,Livet F,et al.In-situ small-angle X-ray scattering study of dynamic precipitation in an Al-Zn-MgCu alloy[J].Philos.Mag.,2003,83(6):677-692.
[9]Fribourg G,Bréchet Y,Deschamps A,et al.Microstructure based modeling of isotropic and kinematic strain hardening in a precipitation-hardened aluminum alloy[J].Acta Mater,2011,59(9):3621-3635.