Superplasticity deformation of Ti-6Al-2Zr-1Mo-1V induced by the cyclic change of strain-rate and MaxmSPD

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • G. C. Wang
  • M. W. Fu
  • H. B. Dong
  • Q. J. Sun
  • C. X. Cao

Detail(s)

Original languageEnglish
Pages (from-to)213-217
Journal / PublicationJournal of Alloys and Compounds
Volume491
Issue number1-2
Publication statusPublished - 18 Feb 2010
Externally publishedYes

Abstract

Ti-6Al-2Zr-1Mo-1V is a near α-based Ti-alloy widely used in aerospace industries. Using this alloy to make large and complex-geometry aerospace components, it requires large forming equipment and consumes a great deal of energy. For integral forming of products by using this Ti-alloy, superplasticity deformation (SPD) is a promising process as it increases product strength, reduces product weight, saves materials and uses small capacity equipment. In this paper, the SPD of the Ti-alloy by two different SPD approaches was conducted. The first approach is the SPD induced by the cyclic change of strain-rate; while the other is the maximum strain-rate sensitivity exponent (m) SPD (MaxmSPD). The as-received bulk material was first pre-processed via upsetting and cogging deformation such that the fine microstructure with grain size less than 10 μm was obtained. For the first approach, the strain-rate varied following a continuous variation pattern until the final necking occurred. In addition, three deformation temperatures, viz., 850, 900, 950 °C, and the strain-rate of 5 × 10-5-5 × 10-3 s-1 were employed. The rheological behavior and the effect of process parameters on flow stress and the value of m were investigated. The best elongation of 830% at 900 °C was obtained. For the MaxmSPD, the best elongation of 1066% at 900 °C was identified. The superplasticity capacity is increased by 28.43% compared to the first approach. Therefore, the MaxmSPD has a better SPD capability than the SPD induced by the cyclic change of strain-rate for Ti-6Al-2Zr-1Mo-1V alloy. © 2009 Elsevier B.V. All rights reserved.

Research Area(s)

  • Maximum m SPD, SPD induced by the cyclic changing strain-rate, Superplasticity deformation (SPD), Ti-6Al-2Zr-1Mo-1V

Citation Format(s)

Superplasticity deformation of Ti-6Al-2Zr-1Mo-1V induced by the cyclic change of strain-rate and MaxmSPD. / Wang, G. C.; Fu, M. W.; Dong, H. B.; Lu, J.; Sun, Q. J.; Cao, C. X.

In: Journal of Alloys and Compounds, Vol. 491, No. 1-2, 18.02.2010, p. 213-217.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review