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Basal slip and twinning in α-titanium single crystals

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Abstract

Single crystals of α-titanium, with small Schmid factors for prismatic slip, have been deformed in tension between 78 and 1120 K. At low temperatures, {1012} twinning has been observed in specimens having the angle between the basal plane and the tensile axis,x B , close to 90 deg, whereas at intermediate orientations withx B = 60 deg and 47 deg twinning occurs on the {1121} planes. A critical resolved shear stress law is not obeyed for either twinning mode. First order prismatic slip in the microstrain region appears to be responsible for the nucleation of {1121 twins. Slip is unlikely a pre-requisite for {1012} twinning.

Basal slip without interference from twinning is observed in a variety of orientations at temperatures above 500 K. Plastic flow above 900 K may be described by an equation of the form:γ=Aτ ne-Q/kT The relative ease of basal and prismatic slip in Ti and Zr is discussed in terms of the hcp ⇆ bcc allotropic transformation.

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Authors and Affiliations

  1. Department of Metallurgy, University of British Columbia, Vancouver, Canada

    A. Akhtar (Visiting Assistant Professor)

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  1. A. Akhtar
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Akhtar, A. Basal slip and twinning in α-titanium single crystals. Metall Trans A 6, 1105–1113 (1975). https://doi.org/10.1007/BF02661366

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