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Effect of microstructure on fracture characteristics of Ti-6Al-2Sn-2Zr-2Mo-2Cr-Si

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Abstract

The effects of intermetallic compounds of Ti3Al (α 2) and silicide separately on fracture characteristics of Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-62222S) alloy were investigated in this study. The alloys with only Ti3Al and only silicide precipitated were established by aging treatments at temperatures of 913 K followed by air cooling and 1088 K followed by water quenching, respectively. X-ray diffraction analysis results showed that the volume fraction of either Ti3Al or silicide increases with increasing aging time. Tensile properties, namely, yield stress (0.2 pct proof stress), ultimate tensile strenght, and elongation of as-received alloy are much better than those of the aged alloys. The strength of the alloy with only Ti3Al is better than that of the alloy with only silicide, while elongation of the alloy with only silicide is better than that of the alloy with only Ti3Al. Fracture toughness, J IC, of the alloy with only silicide is better than that of the alloy with only Ti3Al. The intergranular fracture appears in the alloy with only Ti3Al. Coarsening of Widmanstätten α structure and increasing ductility of β phase during aging are considered to be effective for increasing fracture toughness.

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Authors and Affiliations

  1. the Department of Production Systems Engineering, Toyohashi University of Technology, 441-8580, Toyohashi, Japan

    Mitsuo Niinomi (Professor), Kei-Ichi Fukunaga (Research Associate) &  Gunawarman (Graduate Student)

  2. Interproject Corp., 163-0828, Tokyo, Japan

    Genzo Tono (Engineer)

  3. the Department of Materials Science, Faculty of Engineering, Tohoku University, 980-8579, Sendai, Japan

    Junichi Koike (Associate Professor)

  4. Graduate Materials Engineering, The University of Dayton, 45469-0240, Dayton, OH

    Daniel Eylon (Professor and Director)

  5. Asian Office of CSAFOSR, 106-0032, Tokyo, Japan

    Shiro Fujishiro (former Director)

Authors
  1. Mitsuo Niinomi
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  2. Kei-Ichi Fukunaga
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  3. Gunawarman
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  4. Genzo Tono
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  5. Junichi Koike
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  6. Daniel Eylon
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  7. Shiro Fujishiro
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Niinomi, M., Fukunaga, KI., Gunawarman et al. Effect of microstructure on fracture characteristics of Ti-6Al-2Sn-2Zr-2Mo-2Cr-Si. Metall Mater Trans A 32, 2795–2804 (2001). https://doi.org/10.1007/s11661-001-1030-9

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  • DOI: https://doi.org/10.1007/s11661-001-1030-9

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