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| ON THE AGE-HARDENING OF MAGNESIUM-ZINC ALLOY |
| HU SU-HUI; SU CH'IEN-WU; HS SHUN-SHêNG(Institute of Metallurgy; Academia Sinica) |
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Cite this article:
HU SU-HUI; SU CH'IEN-WU; HS SHUN-SHêNG(Institute of Metallurgy; Academia Sinica). ON THE AGE-HARDENING OF MAGNESIUM-ZINC ALLOY. Acta Metall Sin, 1965, 8(4): 475-551.
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Abstract The mechanism of age-hardening of magnesium-zinc alloy has been investigated by means of hardness measurement, tensile test, metallographic examination and X-ray analysis. It is shown that when the magnesium-5%zinc alloy is aged at 200℃ for not too long a period, a hexagonal transition phase β' is precipitated, which is rod-like, orientated perpendicularly to the basal plane of the magnesium matrix and coherent to it. The existence of such transition β' precipitates raises the yield strength of the alloy but does not change appreciably its rate of strain hardening in tension test at 77°K. It is presumed that when this age-hardened alloy was plastically deformed, the gliding dislocations were unable to cut through the β' rods but piled-up against them. The coherent stress field accompanying the β' phase is the principal reason to account for the rise of yield strength of the alloy after aging. Additional external stress must be applied in order to overcome such coherent stress field and to force the constricted gliding dislocations to cross-slip into the prismatic planes of the matrix.
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Received: 18 April 1965
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