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The Effects of Interstitial Impurities on the Yielding Behaviour of Niobium Single Crystals
Author(s) -
Kim H. C.,
Pratt P. L.
Publication year - 1970
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19700410236
Subject(s) - impurity , niobium , materials science , crystal twinning , yield (engineering) , lattice (music) , hardening (computing) , single crystal , crystallography , condensed matter physics , thermodynamics , metallurgy , chemistry , composite material , microstructure , organic chemistry , physics , layer (electronics) , acoustics
The effect of the overall impurity content on the yielding behaviour of niobium single crystals has been investigated in tension between 77 and 473 °K. In the 〈110〉 orientation the amount of yield drop depends on the impurity level of the crystal, and the temperature dependence of the yield stress was decreased significantly for both 〈110〉 and 〈100〉 orientations for purer crystals. Current theories of solution and lattice hardening were applied to try to account for the observed temperature dependence of the yield stress. Gilman's reaction rate theory is found to be the best explanation for the observed yielding behaviour. The twinning stress of 〈110〉 oriented single crystals in compression showed no systematic variation with impurity content when tested at 20.4 °K.