The partial liquidus projection and solidification sequences in Ti-(40–60) Al-(5–30) Nb alloys

Shuai Xu; Yongfeng Liang; Junpin Lin; Heng Zhang; Gang Yang; Xiaotong Guo; Simbarashe Fashu; Jianping He

doi:10.1016/j.jallcom.2020.157734

The partial liquidus projection and solidification sequences in Ti-(40–60) Al-(5–30) Nb alloys

Shuai Xu, Yongfeng Liang, Junpin Lin^*, Heng Zhang, Gang Yang, Xiaotong Guo^*, Simbarashe Fashu, Jianping He

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The properties of Ti–Al–Nb alloys strongly depend on alloy compositions and microstructures. Proper design of these important aspects requires detailed knowledge of the solidification sequences and liquidus projection. However, there are still some conflicts between previous experimental and calculated results about the liquidus projections in the composition range of Ti-(40–60)Al-(5–30)Nb and this has hindered Ti–Al–Nb alloy development. In this present work, we explicitly investigated the as-cast microstructures and phase constitution of 50 alloys with the composition range of Ti-(40–60)Al-(5–30)Nb and clarified the solidification sequences. We re-constructed the partial liquidus projection and found that the primary β phase region extend to just below 55 at.% Al content and the primary α phase region extend to just below 24 at.% Nb content. Moreover, it was observed that the invariant reaction between Liquid, β, α and γ phases is a peritectic reaction (Liquid+β+γ→α) and all the Liquid+β+γ, Liquid+β+α and Liquid+α+γ three-phase regions are of peritectic type. The present work provides essential information necessary for optimizing the Ti–Al–Nb thermodynamic database to accelerate alloy development.

Original language	English
Journal	Journal of Alloys and Compounds
DOIs	https://doi.org/10.1016/j.jallcom.2020.157734
State	E-pub ahead of print - 27 Oct 2020

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@article{aebdfa45989b49229a541799905e4bb8,

title = "The partial liquidus projection and solidification sequences in Ti-(40–60) Al-(5–30) Nb alloys",

abstract = "The properties of Ti–Al–Nb alloys strongly depend on alloy compositions and microstructures. Proper design of these important aspects requires detailed knowledge of the solidification sequences and liquidus projection. However, there are still some conflicts between previous experimental and calculated results about the liquidus projections in the composition range of Ti-(40–60)Al-(5–30)Nb and this has hindered Ti–Al–Nb alloy development. In this present work, we explicitly investigated the as-cast microstructures and phase constitution of 50 alloys with the composition range of Ti-(40–60)Al-(5–30)Nb and clarified the solidification sequences. We re-constructed the partial liquidus projection and found that the primary β phase region extend to just below 55 at.% Al content and the primary α phase region extend to just below 24 at.% Nb content. Moreover, it was observed that the invariant reaction between Liquid, β, α and γ phases is a peritectic reaction (Liquid+β+γ→α) and all the Liquid+β+γ, Liquid+β+α and Liquid+α+γ three-phase regions are of peritectic type. The present work provides essential information necessary for optimizing the Ti–Al–Nb thermodynamic database to accelerate alloy development.",

author = "Shuai Xu and Yongfeng Liang and Junpin Lin and Heng Zhang and Gang Yang and Xiaotong Guo and Simbarashe Fashu and Jianping He",

year = "2020",

month = oct,

day = "27",

doi = "10.1016/j.jallcom.2020.157734",

language = "英语",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

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TY - JOUR

T1 - The partial liquidus projection and solidification sequences in Ti-(40–60) Al-(5–30) Nb alloys

AU - Xu, Shuai

AU - Liang, Yongfeng

AU - Lin, Junpin

AU - Zhang, Heng

AU - Yang, Gang

AU - Guo, Xiaotong

AU - Fashu, Simbarashe

AU - He, Jianping

PY - 2020/10/27

Y1 - 2020/10/27

N2 - The properties of Ti–Al–Nb alloys strongly depend on alloy compositions and microstructures. Proper design of these important aspects requires detailed knowledge of the solidification sequences and liquidus projection. However, there are still some conflicts between previous experimental and calculated results about the liquidus projections in the composition range of Ti-(40–60)Al-(5–30)Nb and this has hindered Ti–Al–Nb alloy development. In this present work, we explicitly investigated the as-cast microstructures and phase constitution of 50 alloys with the composition range of Ti-(40–60)Al-(5–30)Nb and clarified the solidification sequences. We re-constructed the partial liquidus projection and found that the primary β phase region extend to just below 55 at.% Al content and the primary α phase region extend to just below 24 at.% Nb content. Moreover, it was observed that the invariant reaction between Liquid, β, α and γ phases is a peritectic reaction (Liquid+β+γ→α) and all the Liquid+β+γ, Liquid+β+α and Liquid+α+γ three-phase regions are of peritectic type. The present work provides essential information necessary for optimizing the Ti–Al–Nb thermodynamic database to accelerate alloy development.

AB - The properties of Ti–Al–Nb alloys strongly depend on alloy compositions and microstructures. Proper design of these important aspects requires detailed knowledge of the solidification sequences and liquidus projection. However, there are still some conflicts between previous experimental and calculated results about the liquidus projections in the composition range of Ti-(40–60)Al-(5–30)Nb and this has hindered Ti–Al–Nb alloy development. In this present work, we explicitly investigated the as-cast microstructures and phase constitution of 50 alloys with the composition range of Ti-(40–60)Al-(5–30)Nb and clarified the solidification sequences. We re-constructed the partial liquidus projection and found that the primary β phase region extend to just below 55 at.% Al content and the primary α phase region extend to just below 24 at.% Nb content. Moreover, it was observed that the invariant reaction between Liquid, β, α and γ phases is a peritectic reaction (Liquid+β+γ→α) and all the Liquid+β+γ, Liquid+β+α and Liquid+α+γ three-phase regions are of peritectic type. The present work provides essential information necessary for optimizing the Ti–Al–Nb thermodynamic database to accelerate alloy development.

UR - https://www.mendeley.com/catalogue/4f4d3a54-6357-3808-9df1-531ea77a27d2/

U2 - 10.1016/j.jallcom.2020.157734

DO - 10.1016/j.jallcom.2020.157734

M3 - 文章

SN - 0925-8388

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

The partial liquidus projection and solidification sequences in Ti-(40–60) Al-(5–30) Nb alloys

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