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On solid solution hardening in the zirconium-oxygen system

AuthorsRuano, Oscar Antonio; Elssner, G.
KeywordsStress-strain measurements
Issue Date1975
CitationJournal of the Less Common Metals 40(1) : 121-128 (1975)
AbstractZirconium-oxygen alloys containing between 0.02 and 1.05 at.% oxygen were prepared by engassing β-Zr at 1500°C followed by an anneal at 800°C. Conventional stress-strain measurements as well as strain-rate-change tests were made. The yield point was determined in the range from 77 to 500 K for wire samples with an α-Zr bamboo structure, and the hardening coefficient, Ar/AC, was found to vary from 0.52 m at 77 K to 0.36 μ at 300 K. Observations with the electron microscope under weak-beam conditions demonstrated the presence of clusters inside the Zr matrix. For the temperature range 0–500 K, two rate-controlling mechanisms are indicated. Below approximately 300 K, the flow stress is composed of a temperature dependent component, caused by the interaction between dislocations and single, interstitial oxygen atoms, and a temperature-independent contribution due to an interaction with stable oxygen clusters. Above about 300 K, the onset of plastic deformation is determined by the overcoming of clusters.
Publisher version (URL)http://dx.doi.org/10.1016/0022-5088(75)90187-3
Appears in Collections:(CENIM) Artículos
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