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Mechanical properties of cyromilled nanocrystalline Zn studied by the miniaturized disk bend test

✍ Scribed by X. Zhang; H. Wang; R.O. Scattergood; J. Narayan; C.C. Koch

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
247 KB
Volume
50
Category
Article
ISSN
1359-6454

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✦ Synopsis

The miniaturized disk bend test (MDBT) is useful for the study of the mechanical properties of small specimens in tension. The yield stress of cryomilled nanocrystalline Zn measured by MDBT shows periodic hardening and softening with milling time, consistent with the variation of microhardness with milling time. The periodic softening is due to the reduction of dislocation density controlled by dynamic recrystallization. The ductility of these softened nanocrystalline Zn specimens is consistently higher than that of the hardened specimens. Young's modulus shows little variation with the average grain size.

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AbstractÐThe mechanical properties of warm compacted nanocrystalline (nc) iron powder compacts of near theoretical density in the grain size range between 8 and 33 nm were investigated. The elastic and plastic behavior were characterized by miniaturized disk bend tests and hardness measurements. Lig