Precipitation of Carbides and Dissolution of Widmanstätten Structure for Enhanced Hardness in Ti                         2                         AlNb-Based Alloys

Yaran Zhang; Qi Cai; Yongchang Liu; Qianying Guo; Huijun Li

doi:10.1007/s11665-019-03965-9

Precipitation of Carbides and Dissolution of Widmanstätten Structure for Enhanced Hardness in Ti ₂ AlNb-Based Alloys

Yaran Zhang, Qi Cai, Yongchang Liu^*, Qianying Guo, Huijun Li

^*Corresponding author for this work

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

4 Citations (Scopus)

Abstract

Carbide-reinforced Ti ₂ AlNb matrix composites were spark plasma sintered at 1100 °C by incorporating CNTs into single-B2-phase Ti-22Al-25Nb powders. The as-SPSed alloys were solution treated and then aged in different phase regions. By kinetics analysis and energy-dispersive spectroscopy, it is found carbon will stabilize α ₂ phase during solution treatment, and the formation of carbide results in the Nb-depleted regions, which further induces the formation of curly B2 + O Widmanstätten structure during quenching. Different from the general Widmanstätten structure in the aged Ti ₂ AlNb alloy, the remained α ₂ will consume the B2 within the Widmanstätten structure, when the carbon-added alloy is aged in B2 + O phase region. Compared to the alloy without CNTs, the Vickers hardness of the aged carbon-added Ti ₂ AlNb alloy is increased significantly, which is related to the uniform and abundant columnar carbides within the O-phase matrix.

Original language	English
Pages (from-to)	1892-1901
Number of pages	10
Journal	Journal of Materials Engineering and Performance
Volume	28
Issue number	3
DOIs	https://doi.org/10.1007/s11665-019-03965-9
Publication status	Published - 15 Mar 2019
Externally published	Yes

Keywords

Ti AlNb-based alloy
Widmanstätten structure
carbon alloying
hardness
kinetics

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10.1007/s11665-019-03965-9

Cite this

Zhang, Y., Cai, Q., Liu, Y., Guo, Q., & Li, H. (2019). Precipitation of Carbides and Dissolution of Widmanstätten Structure for Enhanced Hardness in Ti ₂ AlNb-Based Alloys Journal of Materials Engineering and Performance, 28(3), 1892-1901. https://doi.org/10.1007/s11665-019-03965-9

@article{6e8af981aba64953be92db418c170ec6,

title = " Precipitation of Carbides and Dissolution of Widmanst{\"a}tten Structure for Enhanced Hardness in Ti 2 AlNb-Based Alloys ",

abstract = " Carbide-reinforced Ti 2 AlNb matrix composites were spark plasma sintered at 1100 °C by incorporating CNTs into single-B2-phase Ti-22Al-25Nb powders. The as-SPSed alloys were solution treated and then aged in different phase regions. By kinetics analysis and energy-dispersive spectroscopy, it is found carbon will stabilize α 2 phase during solution treatment, and the formation of carbide results in the Nb-depleted regions, which further induces the formation of curly B2 + O Widmanst{\"a}tten structure during quenching. Different from the general Widmanst{\"a}tten structure in the aged Ti 2 AlNb alloy, the remained α 2 will consume the B2 within the Widmanst{\"a}tten structure, when the carbon-added alloy is aged in B2 + O phase region. Compared to the alloy without CNTs, the Vickers hardness of the aged carbon-added Ti 2 AlNb alloy is increased significantly, which is related to the uniform and abundant columnar carbides within the O-phase matrix.",

keywords = "Ti AlNb-based alloy, Widmanst{\"a}tten structure, carbon alloying, hardness, kinetics",

author = "Yaran Zhang and Qi Cai and Yongchang Liu and Qianying Guo and Huijun Li",

note = "Publisher Copyright: {\textcopyright} 2019, ASM International.",

year = "2019",

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day = "15",

doi = "10.1007/s11665-019-03965-9",

language = "English",

volume = "28",

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Zhang, Y, Cai, Q, Liu, Y, Guo, Q & Li, H 2019, ' Precipitation of Carbides and Dissolution of Widmanstätten Structure for Enhanced Hardness in Ti ₂ AlNb-Based Alloys ', Journal of Materials Engineering and Performance, vol. 28, no. 3, pp. 1892-1901. https://doi.org/10.1007/s11665-019-03965-9

Precipitation of Carbides and Dissolution of Widmanstätten Structure for Enhanced Hardness in Ti ₂ AlNb-Based Alloys . / Zhang, Yaran; Cai, Qi; Liu, Yongchang et al.
In: Journal of Materials Engineering and Performance, Vol. 28, No. 3, 15.03.2019, p. 1892-1901.

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

TY - JOUR

T1 - Precipitation of Carbides and Dissolution of Widmanstätten Structure for Enhanced Hardness in Ti 2 AlNb-Based Alloys

AU - Zhang, Yaran

AU - Cai, Qi

AU - Liu, Yongchang

AU - Guo, Qianying

AU - Li, Huijun

PY - 2019/3/15

Y1 - 2019/3/15

N2 - Carbide-reinforced Ti 2 AlNb matrix composites were spark plasma sintered at 1100 °C by incorporating CNTs into single-B2-phase Ti-22Al-25Nb powders. The as-SPSed alloys were solution treated and then aged in different phase regions. By kinetics analysis and energy-dispersive spectroscopy, it is found carbon will stabilize α 2 phase during solution treatment, and the formation of carbide results in the Nb-depleted regions, which further induces the formation of curly B2 + O Widmanstätten structure during quenching. Different from the general Widmanstätten structure in the aged Ti 2 AlNb alloy, the remained α 2 will consume the B2 within the Widmanstätten structure, when the carbon-added alloy is aged in B2 + O phase region. Compared to the alloy without CNTs, the Vickers hardness of the aged carbon-added Ti 2 AlNb alloy is increased significantly, which is related to the uniform and abundant columnar carbides within the O-phase matrix.

AB - Carbide-reinforced Ti 2 AlNb matrix composites were spark plasma sintered at 1100 °C by incorporating CNTs into single-B2-phase Ti-22Al-25Nb powders. The as-SPSed alloys were solution treated and then aged in different phase regions. By kinetics analysis and energy-dispersive spectroscopy, it is found carbon will stabilize α 2 phase during solution treatment, and the formation of carbide results in the Nb-depleted regions, which further induces the formation of curly B2 + O Widmanstätten structure during quenching. Different from the general Widmanstätten structure in the aged Ti 2 AlNb alloy, the remained α 2 will consume the B2 within the Widmanstätten structure, when the carbon-added alloy is aged in B2 + O phase region. Compared to the alloy without CNTs, the Vickers hardness of the aged carbon-added Ti 2 AlNb alloy is increased significantly, which is related to the uniform and abundant columnar carbides within the O-phase matrix.

KW - Ti AlNb-based alloy

KW - Widmanstätten structure

KW - carbon alloying

KW - hardness

KW - kinetics

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DO - 10.1007/s11665-019-03965-9

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SN - 1059-9495

VL - 28

SP - 1892

EP - 1901

JO - Journal of Materials Engineering and Performance

JF - Journal of Materials Engineering and Performance

IS - 3

ER -

Precipitation of Carbides and Dissolution of Widmanstätten Structure for Enhanced Hardness in Ti ₂ AlNb-Based Alloys

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