Effect of test temperature, grain size, and alloy additions on the low-temperature fracture toughness of polycrystalline niobium

The current work investigates the effects of test temperature (77-150K), grain size (63-165 mu m), and solid solution alloying additions of zirconium (Zr) on the fracture toughness (K sub q , K sub IC ) of polycrystalline niobium (Nb). Extensive fracture surface analyses of the fractured specimens r...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 1997-11, Vol.28A (11), p.2297-2307A
Main Authors: Samant, A V, Lewandowski, J J
Format: Article
Language:English
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Summary:The current work investigates the effects of test temperature (77-150K), grain size (63-165 mu m), and solid solution alloying additions of zirconium (Zr) on the fracture toughness (K sub q , K sub IC ) of polycrystalline niobium (Nb). Extensive fracture surface analyses of the fractured specimens revealed the location of the apparent cleavage fracture nucleation sites. Comparisons have been made to models for cleavage fracture toughness and to predictions of the peak stress locations using existing finite element models for a crack loaded under plane strain conditions.
ISSN:1073-5623