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为研究5083铝合金在500℃以下的超塑性,在400℃进行了恒应变速率拉伸试验,获得了应变硬化指数n及应变速率敏感性指数m,分析了应变速率ε对伸长率δ,n和m值的影响.结果表明:在400℃时5083铝合金可获得的最大伸长率为278%,对应的ε=0.000 26 s-1,n=0.122,m=0.274;n随应变速率增大而减小,δ和m随应变速率增大先增大后减小,其中δ受应变速率影响显著.

To investigate the superplasticity of 5083 aluminum alloy below 500 ℃, constant-strain-rate tensile tests were performed at 400 ℃. The strain hardening exponent n and strain rate sensitivity index m were obtained. And the influence of strain rate on elongation δ, n and m was analyzed. The results indicate that the maximum elongation of 5083 aluminum alloy at 400 ℃ was 278% at constant strain rate 0. 000 26 s-1, n=0.122 and m=0.274. The increase of strain rate caused n decreasing and peak values of δ and m. The effect of ε on δ was obvious.

参考文献

[1] Ravi Verma;Sooho Kim .Superplastic Behavior of Copper-Modified 5083 Aluminum Alloy[J].Journal of Materials Engineering and Performance,2007(2):185-191.
[2] 时张杰 .铝合金超塑性差温拉深研究[D].南京航空航天大学,2007.
[3] 宋玉泉,程永春,王习文.拉伸变形应变硬化指数的实验测量及其精细分析[J].中国科学E辑,2001(03):193-203.
[4] 宋玉泉,管志平,马品奎,宋家旺.拉伸变形应变硬化指数的理论和实验规范[J].金属学报,2006(07):673-680.
[5] Marta Urdanpilleta;Jose Manuel Martinez-Esnaola;Javier Gil Sevillano .Strain Rate Sensitivity of Superplastic Inconel 718[J].Materials transactions,2005(7):1711-1719.
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