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Mechanical behavior of fine-grained Mg-6.5Li at elevated temperature

Published online by Cambridge University Press:  03 March 2011

Eric M. Taleff  and
Oleg D. Sherby
Eric M. Taleff
Affiliation:
Department of Mechanical Engineering, Stanford University, Stanford, California 94305
Oleg D. Sherby
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
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Abstract

A Mg-6.5 wt. % Li alloy containing 80% hep alpha phase and 20% bcc beta phase was processed to achieve an average grain size of 5.9 μm. Strain-rate-change tests were performed in the temperature range from 398 K to 573 K. Two types of creep behavior were observed. A stress exponent of five, obtained at low temperatures and high stresses, is attributed 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 creep process in the alpha matrix.

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Type
Articles
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Journal of Materials Research , Volume 9 , Issue 6 , June 1994 , pp. 1392 - 1396
Copyright
Copyright © Materials Research Society 1994

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References

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