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Effect of Al Addition on ω Precipitation and Age Hardening of Ti-Al-Mo-Fe Alloys

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Abstract

The effect of Al addition on ω precipitation and age-hardening behavior of Ti-9.2Mo-2Fe and Ti-2Al-9.2Mo-2Fe alloy during aging treatment was investigated. The results showed that athermal and isothermal ω phase formation in Ti-2Al-9.2Mo-2Fe alloy was suppressed to a certain extent due to Al addition. In addition, a small amount of athermal ω phase was observed in the β matrix with a size of about ~5 nm during water quenching from above the β transus temperature for both alloys. Isothermal ω formation was also found during aging at temperatures ranging from 573 K to 773 K (300 °C to 500 °C) in both alloys, although it had a limited time of stability at 773 K (500 °C). The hardening due to isothermal ω precipitation exhibited no over-aging as long as ω phase existed in both alloys, and ω phase played a more important role in hardening than α phase. And the ω phase in 50 to 100 nm size exhibited the best hardening effect in Ti-9.2Mo-2Fe alloy. Similarly, α phase with 100 to 200 nm in length showed better hardening effects in Ti-2Al-9.2Mo-2Fe alloy. Both the alloys showed stronger age hardening at an intermediate temperature of 673 K (400 °C) and in the first aging stage at a higher temperature of 773 K (500 °C) due to the sufficiently fine size (50 nm), while they exhibited weaker age hardening at a lower temperature of 573 K (300 °C) and long period aging at a higher temperature of 773 K (500 °C) due to incomplete ω formation and/or coarsening of α phase. No over or peak aging stage was found at 573 K and 673 K (300 °C and 400 °C) during the aging for 72 hours, while the peak hardness values of both alloys aged at 773 K (500 °C) were obtained in the first stage of aging. The hardness of the alloys was very sensitive to size and volume fraction of ω phase, which depends on aging temperature, time, and composition of the involved alloys.

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Acknowledgments

The authors appreciated the support of Korea Institute of Materials Science (KIMS, Korea) and General Research Institute for Nonferrous Metals (GRINM, China). The research was funded by the Ministry of Science, ICT and Future Planning (MSIP), the Ministry of Trade, Industry & Energy (MOTIE), and the Ministry of Science and Technology of China under Grant No. 2010DFA52280. And Mr. Jung-hwa Seo and Miss Ji-hye Lee are also gratefully acknowledged for their practical supports. Friendship support of Dr. Yang Yu, Dr. Yanyan Fu, and Dr. Rui Liu is also highly appreciated.

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Authors and Affiliations

  1. State Key Laboratory for Fabrication & Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing, China

    Chenglin Li, Xujun Mi, Wenjun Ye & Songxiao Hui

  2. Materials Metallurgical Engineering, Sunchon National University, Suncheon, Korea

    Dong-Geun Lee

  3. Titanium Research Laboratory, Korea Institute of Materials Science, Changwon, Korea

    Yongtai Lee

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  1. Chenglin Li
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  2. Dong-Geun Lee
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Correspondence to Dong-Geun Lee.

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Manuscript submitted March 14, 2012.

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Li, C., Lee, DG., Mi, X. et al. Effect of Al Addition on ω Precipitation and Age Hardening of Ti-Al-Mo-Fe Alloys. Metall Mater Trans A 47, 2454–2461 (2016). https://doi.org/10.1007/s11661-016-3386-x

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