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Flow Instabilities and fracture in Ti-6Al-4V deformed in compression at 298 K to 673 K

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Abstract

Uniaxial compression tests were conducted on Ti-6Al-4V specimens in the strain-rate range of 0.001 to 1 s−1 and temperature range of 298 to 673 K. The stress-strain curves exhibited a peak flow stress followed by flow softening. Up to 523 K, the specimens cracked catastrophically after the flow softening started. Adiabatic shear banding was observed in this regime. The fracture surface exhibited both mode I and II fracture features. The state of stress existing in a compression test specimen when bulging occurs is responsible for this fracture. The instabilities observed in the present tests are classified as “geometric” in nature and are state-of-stress dependant, unlike the “intrinsic” instabilities, which are dependant on the dynamic constitutive behavior of the material.

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Authors and Affiliations

  1. Department of Metallurgy, Indian Institute of Science, 560 012, Bangalore, India

    Y. V. R. K. Prasad (Professor)

  2. Department of Mechanical Engineering, Indian Institute of Science, 560 012, Bangalore, India

    S. K. Biswas (Professor)

Authors
  1. Satish V. Kailas
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  2. Y. V. R. K. Prasad
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  3. S. K. Biswas
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Additional information

Formerly Graduate Student, is Research Associate, Department of Mechanical Engineering, Indian Institute of Science.

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Kailas, S.V., Prasad, Y.V.R.K. & Biswas, S.K. Flow Instabilities and fracture in Ti-6Al-4V deformed in compression at 298 K to 673 K. Metall Mater Trans A 25, 2173–2179 (1994). https://doi.org/10.1007/BF02652318

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  • DOI: https://doi.org/10.1007/BF02652318

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