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Effect of α′ Martensite on Microstructure Refinement After α + β Isothermal Treatment in a Near-α Titanium Alloy Ti60

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Abstract

The effect of the α′ martensite on microstructure refinement after α + β isothermal treatment in a near-α titanium alloy Ti60 was investigated. A high density of the refined acicular α plates nucleate and grow inside α′ martensite during the isothermal treatment. The refinement mechanism of the α′ martensite was determined by comparing the direct β to α and α′ to α phase transformations. The α phase prefers to nucleate along the grain boundaries during the β → α transformation. However, in the α′ martensite, the refinement of the α phase is attributed to the precipitation of a small amount of β phase in between the adjacent α phase, and the stacking faults inside the α′ martensite. In addition, the yield strength and elongation of the alloy both increase due to the refinement of the α phase.

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Acknowledgments

This work was supported by the Project of Introducing Talents of Discipline to Universities (No. B08040).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

    Feng Sun, Jinshan Li, Hongchao Kou & Bin Tang

  2. Beijing Institute of Aeronautical Materials, Beijing, 100095, China

    Jianming Cai

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  1. Feng Sun
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  2. Jinshan Li
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  3. Hongchao Kou
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  4. Bin Tang
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Correspondence to Feng Sun.

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Sun, F., Li, J., Kou, H. et al. Effect of α′ Martensite on Microstructure Refinement After α + β Isothermal Treatment in a Near-α Titanium Alloy Ti60. J. of Materi Eng and Perform 24, 1945–1952 (2015). https://doi.org/10.1007/s11665-015-1486-1

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  • DOI: https://doi.org/10.1007/s11665-015-1486-1

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