Metallurgical Transactions

, Volume 4, Issue 3, pp 847–856

Importance of slip mode for dispersion-hardened β-titanium alloys

  • T. Hamajima
  • G. Lütjering
  • S. Weissmann
Mechanical Behavior

DOI: 10.1007/BF02643096

Cite this article as:
Hamajima, T., Lütjering, G. & Weissmann, S. MT (1973) 4: 847. doi:10.1007/BF02643096

Abstract

The mechanical properties of Ti-7 Mo-7 Al and Ti-7 Mo-16 Al (in at. pct) were correlated to the microstructure. The mechanical properties of the alloy with low aluminum content, consisting of α+ β phases, were dependent on the size of the α particles. Although the α phase is softer than the β phase, the small α particles, upon plastic deformation of the alloy, functioned as typical hard agents in a dispersion-hardened system and the volume fraction of the particles controlled the macroscopic ductility. A rapid strain-hardening behavior of the small α particles seemed to be responsible for this effect. Large α particles behaved like soft, incoherent particles, the volume fraction having little effect on the inherent ductility of the alloy. The two phase (β+ Ti3Al) microstructure of the alloy with high aluminum content resulting from high temperature aging to 900°C exhibited a yield stress of 130 ksi and an elongation to fracture of 5 pct. The ductility of this microstructure was controlled by the volume fraction of the Ti3Al particles inducing homogeneous slip. The favorable ductility properties of the microstructures with low Ti3Al volume fraction were lost if the slip mode was changed from homogeneous slip to planar slip.

Copyright information

© American Society for Metals, The Melallurgical Society of AIME 1973

Authors and Affiliations

  • T. Hamajima
    • 1
  • G. Lütjering
    • 2
  • S. Weissmann
    • 1
  1. 1.Department of Mechanics and Materials ScienceRutgers UniversityNew Brunswick
  2. 2.Deutsche Forschungs-und Versuchsanstalt Für Luft-und Raumsfahrt E. V. Linder HöheGermany

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