Abstract
The effect of temperature and strain-rate on the yield and flow stress of zirconium, containing oxygen in the range of 0.09 to about 2.5 at. % has been examined at temperatures between 77 and 700° K. The above measurements were coupled with strain rate change tests and stress-relaxation experiments, so that all the deformation parameters associated with thermal activation could be evaluated.
The results of these measurements showed that the thermal component of flow stress increases with increasing oxygen content of the alloy. Two stages of activation were found to occur for all these alloys. The first stage was associated with the unpinning of dislocation loops from impurity pinning points. At higher temperatures, because of the unpinning of many impurity pinning points, a second stage of activation associated with a different mechanism was found to occur. The variation of certain parameters associated with this stage of deformation strongly suggests the Peierls-Nabarro force as the controlling criterion.
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References
H. Conrad, in “The Relation of Structure to Mechanical Properties of Metals”, Vol. II (HMSO, London, 1963) p. 476.
D. F. Stein,Acta Met. 15 (1967) 150.
H. Conrad,ibid p. 147.
P. Wynblatt andJ. E. Dorn,Trans. Met. Soc. AIME 236 (1966) 1451.
B. L. Mordike andP. Haasen,Phil. Mag. 7 (1962) 459.
D. F. Stein,Acta Met. 14 (1966) 99.
E. J. Rapperport andC. S. Hartley,Trans. Met. Soc. AIME 218 (1960) 869.
E. D. Levine,ibid 36 (1966) 1558.
R. N. Orava, G. Stone, andH. Conrad,Trans. Amer. Soc. Metals 59 (1966) 171.
B. D. Lichter,Trans. Met. Soc. AIME 218 (1960) 1015.
H. Conrad andH. Wiedersich,Acta Met. 9 (1960) 367.
A. Seeger, in “Dislocations and Mechanical Properties of Crystals” (Wiley, New York, 1957) p. 243.
P. Feltham,Phil. Mag. 6 (1961) 259.
G. A. Sargent,Acta Met. 13 (1965) 663.
P. J. Wray andG. T. Horne,Phil. Mag. 13 (1966) 899.
B. Harris (The University, Falmer, Brighton, Sussex, UK) personal communication.
D. A. Koss, unpublished work.
J. W. Christian andB. C. Masters,Proc. Roy. Soc. A281 (1964) 240.
A. H. Cottrell in “Report on the Strength of Solids” (Phys. Soc., London, 1948) p. 30.
J. Friedel in “The Relation of Structure to Mechanical Properties of Metals,” Vol. I (HMSO, London, 1963) p. 410.
R. L. Fleischer andW. R. Hibbard Jr,ibid p. 262.
J. Friedel in “Internal Stress and Fatigue in Metals” (Elsevier, Amsterdam, 1959) p. 220.
P. W. Flynn, J. D. Mote, andJ. E. Dorn,Trans. Met. Soc. AIME 221 (1961) 1148.
Z. S. Basinski,Phil. Mag. 4 (1959) 393.
J. E. Dorn andS. Rajnak,Trans. Met. Soc. AIME 230 (1964) 1052.
B. L. Mordike,Z. Metalk. 53 (1962) 586.
R. J. Arsenault,Acta Met. 15 (1967) 501.
L. J. Teutonico, A. V. Granato, andK. Lücke,J. Appl. Phys. 35 (1964) 220.
A. Seeger andP. Schiller,Acta Met. 10 (1962) 348.
J. H. Mogard andB. L. Averbach,ibid 7 (1958) 552.
R. Krishnan, Ph.D. thesis, Bombay University (1966).
P. Das Gupta andV. S. Arunachalam,Trans. Ind. Inst. to be published.
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Das Gupta, P., Arunachalam, V.S. Thermally activated deformation in dilute zirconium/oxygen alloys. J Mater Sci 3, 271–281 (1968). https://doi.org/10.1007/BF00741961
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DOI: https://doi.org/10.1007/BF00741961