Abstract
This paper presents the results of a study of the effect of matrix yield strength, at a constant Widmanstätten α microstructure, on the nucleation and growth of voids in an α-β titanium alloy, CORONA-5, Ti-5Al-4.5Mo-l.5Cr. Four microstructures with a retained β matrix and involving coarse or fine Widmanstätten α particles in coarse or fine β grains were used in different heat treatment conditions resulting in yield strengths from 765 to 1018 MPa. Void nucleation occurred atα/α boundaries, grain boundary α/matrix interfaces, α twin/matrix interfaces, and α twin/untwin boundaries. The void nucleation strain varied from 0 to 0.26 and was a function of both microstructure and yield strength. Void growth rates increased with yield strength for all microstructures except for those containing coarse α which decreased with yield strength. Intense shear was observed in colonies of fine α structures and was considered to be the cause of the observed rapid void growth rates in the fine β+ fine α microstructures. Surface cracking occurred in several aged conditions during straining. This cracking was attributed to strain concentration in α.
Similar content being viewed by others
References
R. H. Van Stone, T. B. Cox, J.R. Low, Jr., and J.A. Psioda: Intl.Met. Rev., 1985, vol. 30, no.4, pp. 157–79.
M. A. Greenfield and H. Margolin:Metall. Trans., 1972, vol. 3, pp. 2649–59.
H. Margolin and Y. Mahajan:Metall. Trans. A, 1978, vol. 9A, pp. 787–91.
H. Margolin and L. Rozenberg:Titanium ’80, Science and Technol- ogy, TMS-AIME, Warrendale, PA, 1980, vol. 3, pp. 1637–43.
H. Margolin and T. V. Vijayaraghavan:Metall. Trans. A, 1983, vol. 14A, pp. 2043–53.
P. Bridgman:Studies in Large Plastic Flow and Fracture, McGraw- Hill, New York, NY, 1952, pp. 9–37.
A.K. Bowen:Mater. Sci. Engg., 1977, vol. 29, pp. 19–28.
T. V. Vijayaraghavan and H. Margolin: unpublished research, Poly- technic University, Brooklyn, NY 11201, 1986.
S. Ankem and H. Margolin:Metall. Trans. A, 1982, vol. 13A, pp. 603–09.
Binary Alloy Phase Diagrams, ASM, T. B. Massalski, J. L. Murray, L. H. Bennet, and H. Baker, eds., 1986, p. 175.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Narendrnath, K.R., Margolin, H. The effect of matrix strength on void nucleation and growth in a widmanstätten alpha-beta titanium alloy, CORONA-5. Metall Trans A 19, 1163–1171 (1988). https://doi.org/10.1007/BF02662576
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02662576