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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.44  No.4 (2003)  >  pp.445-451

MATERIALS TRANSACTIONS
<<Previous article Vol.44  No.4 (2003)   pp.445 - 451 Next article>>

Grain-Boundary Sliding in AZ31 Magnesium Alloys at Room Temperature to 523 K

J. Koike1), R. Ohyama1), T. Kobayashi1), M. Suzuki1) and K. Maruyama1)
1) Department of Materials Science, Tohoku University

Rolled sheets of AZ31 Mg alloys were subjected to tensile testing at temperatures ranging from room temperature to 523 K. The occurrence of grain-boundary sliding (GBS) at room temperature was demonstrated by the displacement of scribed lines across grain boundaries of deformed samples. Surface relief of deformed samples was measured by use of a scanning laser microscope. GBS strain was calculated from the measured surface step height, and its temperature dependence was analyzed by a Dorn-type constitutive equation. GBS above 423 K was found to be pure GBS that was activated by resolved applied shear stress acting on grain boundaries. The activation energy for GBS was found to be 80 kJ/mol, which is in agreement with the activation energy for grain boundary diffusion. Meanwhile, GBS below 373 K was found to be slip-induced GBS, and its extent was found to be significantly greater than that expected from extrapolation of high-temperature values. The slip-induced GBS is considered to occur by plastic compatibility conditions in the presence of plastic strain anisotropy and by absorption and dissociation of lattice dislocations at grain boundaries.


Keyword:
magnesium, mechanical property, grain-boundary sliding, room temperature

Received: November 11, 2002
Accepted: March 03, 2003 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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