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High-temperature and cyclic corrosion crack resistance of alloys of the Ti-Si-Al-Zr system

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Abstract

We study new alloys of the Ti-Si-Al-Zr system. It is shown that the high-temperature and cyclic corrosion crack-growth resistances of cast materials remain practically constant up to temperatures of 700–800°C and in a 3% NaCl solution (pH = 7), respectively. Annealing and quenching from the (α + β)-and β-phase regions of Ti-4Si-5Al-5Zr cast alloy lead mainly to changes in the structure of the matrix and do not improve its strength and cyclic crack-growth resistance in the investigated working media, except the increase in the threshold of corrosion fatigue after treatment from the β-region and formation of a lamellar β-matrix. The increase in the strength, plasticity, and cyclic crack-growth resistance of these alloys at room and high temperatures is attained as a result of the formation of a globular structure of the matrix and silicide phase after thermomechanical treatment with deformation of at least 90%.

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Authors and Affiliations

  1. Karpenko Physicomechanical Institute, Ukrainian Academy of Sciences, Lviv

    O. P. Ostash, A. D. Ivasyshyn, B. D. Vasyliv & I. Yu. Okun’

  2. Frantsevych Institute for Problems in Materials Science, Ukrainian Academy of Sciences, Kyiv

    O. P. Ostash, A. D. Ivasyshyn, B. D. Vasyliv & I. Yu. Okun’

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  1. O. P. Ostash
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  2. A. D. Ivasyshyn
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  3. B. D. Vasyliv
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  4. I. Yu. Okun’
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 42, No. 3, pp. 45–56, May–June, 2006.

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Ostash, O.P., Ivasyshyn, A.D., Vasyliv, B.D. et al. High-temperature and cyclic corrosion crack resistance of alloys of the Ti-Si-Al-Zr system. Mater Sci 42, 330–343 (2006). https://doi.org/10.1007/s11003-006-0087-4

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  • DOI: https://doi.org/10.1007/s11003-006-0087-4

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