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Creep behavior of ultra-fine grained Zn–4.5Al

✍ Scribed by J.M. Gobien; K.L. Murty; R.O. Scattergood; F. Goodwin; C.C. Koch

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
606 KB
Volume
527
Category
Article
ISSN
0921-5093

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✦ Synopsis

Creep tests were performed at 295 and 373 K on a cryogenically ball-milled Zn-4.5Al alloy. Creep tests on the as-milled microstructure having an average grain size of 260 nm showed clear signs of a threshold stress. The same material after a targeted heat treatment showed no signs of a threshold stress for the same alloy with an average grain size of 510 nm. In both cases stress exponent (n) values close to 1 and activation energies close to that of grain boundary diffusion were noted. Potential causes of the threshold stress are proposed as being a nanocrystalline oxide dispersion or non-uniform solute segregation, each of which could potentially interfere with grain boundary vacancy transfer mechanisms.

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