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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 6    December 2002

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Deformation mechanism maps of magnesium lithium alloy and their experimental application
CAO Fu-rong(曹富荣), CUI Jian-zhong(崔建忠),WEN Jing-lin(温景林)

Department of Material Forming and Control,
School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China

Abstract:Deformation mechanism maps for binary Mg-(8~9)Li(mass fraction, %) alloy at 423~623K were constructed in order to elucidate the internal meaning of mechanical experimental data at elevated temperatures. The models and data source used for constructing maps and constructed results are presented. It is determined through comparison of mechanical experimental data with constructed deformation mechanism maps that the dominant deformation mechanism for such alloy at 423~623K is lattice diffusion controlled grain boundary sliding. The difference of such deformation mechanism maps from former ones is that dislocation quantity inside the grains participates in the model calculation, which reveals the dislocation features of different deformation mechanisms.

 

Key words:   magnesium alloy; dislocation; superplasticity; creep

ISSN 1672-7029
CN 43-1423/U

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