کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1579826 | 1001232 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Superplasticity, dynamic grain growth and deformation mechanism in ultra-light two-phase magnesium-lithium alloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The maximum superplasticity of 850% and 920% were demonstrated in Mg-7.83Li alloy and Mg-8.42Li alloy at 573Â K and at an initial strain rate of 1.67Â ÃÂ 10â3Â sâ1 and at an initial strain rate of 5Â ÃÂ 10â4Â sâ1, respectively. Optical microstructural observations revealed that dynamic grain growth appears at 573Â K. Different atomic mobilities of Mg, Li, alpha 5.7Li phase and beta(11Li) phase and different Gibbs free energies of alpha 5.7Li phase and beta(11Li) phase contribute to the obvious dynamic grain growth at 573Â K. The dynamic grain sizes at 573Â K were calculated by derived model. It is shown by comparing the stress exponent (n), grain size exponent (p), and deformation activation energy (Q) estimated experimentally with constructed deformation mechanism map incorporating dislocation quantities inside grains that the dominant deformation mechanisms in two alloys are grain boundary sliding accommodated by slip controlled by lattice diffusion.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 527, Issue 9, 15 April 2010, Pages 2335-2341
Journal: Materials Science and Engineering: A - Volume 527, Issue 9, 15 April 2010, Pages 2335-2341
نویسندگان
F.R. Cao, H. Ding, Y.L. Li, G. Zhou, J.Z. Cui,