Abstract
A detailed investigation has been made of the structure of alloys of the Ti-Mo system containing up to 10wt% Mo, water-quenched from theβ-phase region. With increase in molybdenum content, the martensite structure changes from hexagonal (α′) to orthorhombic (α″) at ∼4 wt% Mo, and at 10 wt% Mo, the structure is completely retained β. For alloy compositions <4 wt% Mo, there is a diffusional component in the transformation of the β-phase at the quench rates employed. There is a transition, with increase in molybdenum content, in morphology (from massive to acicular) and in substructure (from dislocations to twins). However, the transitions in crystallography, morphology and sub-structure are not directly related to one another except for an abrupt loss of dislocation substructure at theα′/α″ transition. The α toα″ crystallographic transition has the characteristics of a second order transformation, and evidence has been obtained of the existence of a spinodal within the metastable orthorhombic system. The orthorhombic martensites of Ti-6 and 8 wt% Mo decompose during quenching producing a fine modulated structure within the martensite plates, consistent with a proposed spinodal mode of decomposition.
Similar content being viewed by others
References
H. M. Flower, S. D. Henry andD. R. F. West,J. Mater. Sci. 9 (1974) 57.
Y. C. Huang, S. Suzuki, H. Kaneko andT. Sato, “The Science, Technology and Application of Titanium”, edited by R. I. Jaffee and N. Promisel (Pergamon Press, London, 1970) p. 691.
Idem, ibid, p. 695.
M. Hansen, E. L. Kamen, H. D. Kessler andD. J. McPherson,Tram. AIME 191 (1951) 882.
I. A. Bagariatskii, G. I. Nosova andT. V. Tagunova,Sov. Phys. Doklady 3 (1959) 1014.
J. C. Williams andB. S. Hickman,Met. Trans. 1 (1970) 2648.
D. W. James andD. M. Moon, “The Science, Technology and Application of Titanium”, edited by R. I. Jaffee and N. Promisel (Pergamon Press, London, 1970) p. 767.
H. M. Flower, R. Davis andD. R. F. West, Proceedings of the Third International Conference Titanium, Moscow 1976 (to be published).
M. J. Blackburn andJ. C. Williams,Trans. Met. Soc. AIME 239 (1967) 287.
A. B. Kolachev andV. S. Liasotskaya, “Titanium Science and Technology”, edited by R. I. Jaffee and H. M. Burke (Plenum Press, New York, 1973) p. 1569.
L. N. Guseva andI. V. Egiz,Met. Sci. Heat. Treat. 16 (1974) 355.
R. G. Nichols, H. M. Flower andD. R. F. West,J. Mater. Sci. 8 (1973) 261.
W. G. Burgers,Physics 1 (1934) 561.
A. Kelly andG. W. Groves, “Crystallography and Crystal Defects”, (Longman, London, 1970).
A. D. McQuillan andA. D. McQuillan, “Titanium” (Butterworths, London, 1956).
R. R. Hake, D. H. Leslie andT. G. Berlincourt,J. Phys. Chem. Solids 20 (1961) 177.
K. A. Bywater andJ. W. Christian,Phil. Mag. 25 (1972) 1249.
A. R. G. Brown, D. Clark, J. Eastabrook andK. S. Jepson,Nature 201 (1964) 914.
C. J. Smithells, “Metals Reference Book” (Butterworths, London, 1967).
S. Banerjee andR. Krishnan,Met. Trans. 4 (1973) 1811.
S. Banerjee, S. J. Vijayaker andR. Krishnan, “Titanium Science and Technology”, edited by R. I. Jaffee and H. M. Burke (Plenum Press, New York, London, 1973) p. 1597.
S. Banerjee andR. Krishnan,Acta Met. 19 (1971) 1317.
G. Krauss andA. R. Marder,Met. Trans. 2 (1971) 2343.
H. M. Flower, P. R. Swann andD. R. F. West,J. Mater. Sci. 7 (1972) 929.
C. Hammond,Scripta Met. 6 (1972) 569.
M. Cormier andF. Claisse,J. Less Common Metals 34 (1974) 181.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Davis, R., Flower, H.M. & West, D.R.F. Martensitic transformations in Ti-Mo alloys. J Mater Sci 14, 712–722 (1979). https://doi.org/10.1007/BF00772735
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00772735