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Aging Temperature Dependence of α″-Martensite Decomposition Mechanism in Ti-Al-Fe-Si Alloy

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Abstract

The mechanism by which α″-martensite decomposes in Ti-4Al-4Fe-0.25Si-0.1O alloy is found to change depending on the aging temperature, with Fe-rich α first transforming in twins of α″-martensite. As the aging temperature increases, Fe is segregated at the boundaries between α″ and α. At temperatures > 773 K, the Fe-segregated boundaries provide a nucleation site for B2-structured TiFe intermetallic compounds. This process of α″-martensite decomposition is described as follows: α″ + α″Twin → α″Fe-rich + αFe-rich,V1 → αFe-lean,V2 + αFe-lean,V1 + TiFe.

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This study was supported by Grants from the Fundamental Research Program (PNK5700 and POC2880) of the Korea Institute of Materials Science.

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Authors and Affiliations

  1. Titanium Alloys Department, Metal Materials Division, Korea Institute of Materials Science (KIMS), Changwon, 642-831, Republic of Korea

    Sang Won Lee, Chan Hee Park, Jea Keun Hong & Jong-Taek Yeom

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  1. Sang Won Lee
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  2. Chan Hee Park
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  3. Jea Keun Hong
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Correspondence to Sang Won Lee.

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Manuscript submitted February 9, 2018.

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Lee, S.W., Park, C.H., Hong, J.K. et al. Aging Temperature Dependence of α″-Martensite Decomposition Mechanism in Ti-Al-Fe-Si Alloy. Metall Mater Trans A 49, 5913–5918 (2018). https://doi.org/10.1007/s11661-018-4909-4

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