Em. Taleff et Od. Sherby, MECHANICAL-BEHAVIOR OF FINE-GRAINED MG-6.5LI AT ELEVATED-TEMPERATURE, Journal of materials research, 9(6), 1994, pp. 1392-1396
A Mg-6.5 wt. % Li alloy containing 80% hcp alpha phase and 20% bcc bet
a phase was processed to achieve an average grain size of 5.9 mum. Str
ain-rate-change tests were performed in the temperature range from 398
K to 573 K. Two types of creep behavior were observed. A stress expon
ent of five, obtained at low temperatures and high stresses, is attrib
uted to a diffusion-controlled dislocation creep process in the alpha
matrix. A stress exponent of three, obtained at high temperatures and
low stresses, is attributed to a solute-drag controlled dislocation cr
eep process in the alpha matrix.