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Relationships among thermomechanical treatments, microstructure, and tensile properties of a near beta-titanium alloy: β-CEZ: Part II. Relationships between thermomechanical treatments and tensile properties

Published online by Cambridge University Press:  31 January 2011

L. Mora ,
C. Quesne  and
R. Penelle
L. Mora
Affiliation:
Laboratoire de Métallurgie Structurale (L.M.S.), U. R. A. CNRS no. 1107, ISMA, Bât. 413, Université de Paris-Sud, 91405 Orsay Cedex, France
C. Quesne
Affiliation:
Laboratoire de Métallurgie Structurale (L.M.S.), U. R. A. CNRS no. 1107, ISMA, Bât. 413, Université de Paris-Sud, 91405 Orsay Cedex, France
R. Penelle
Affiliation:
Laboratoire de Métallurgie Structurale (L.M.S.), U. R. A. CNRS no. 1107, ISMA, Bât. 413, Université de Paris-Sud, 91405 Orsay Cedex, France
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Abstract

The tensile properties of the β-CEZ titanium alloy (Ti Al, 2Sn, 4Zr, 4Mo, 2Cr, 1Fe wt. %) have been investigated at intermediate temperatures as a function of the thermomechanical treatments. the strength and ductility have been correlated with the microstructural changes caused by the various heat treatments. It is found that the highest yield strength is associated with a structure containing a small area fraction, a small size, and a high density of primary α platelets (αp). Moreover, the size of the secondary α phase (αs) has been found to affect the yield strength. It is concluded that the ductility is enhanced by a high area fraction of αp platelets and is also sensitive to the density and the morphological orientation of the αp platelets. The interfaces between the αp and β phases play a dominant role in β-CEZ tensile behavior, and transgranular fracture is the main failure feature of this alloy.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 1 , January 1996 , pp. 89 - 99
Copyright
Copyright © Materials Research Society 1996

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References

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