Evaluation of precipitation hardening in TiC-reinforced Ti2AlNb-based alloys

Ya ran Zhang; Qi Cai; Yong chang Liu; Zong qing Ma; Chong Li; Hui jun Li

doi:10.1007/s12613-018-1591-x

Evaluation of precipitation hardening in TiC-reinforced Ti₂AlNb-based alloys

Ya ran Zhang, Qi Cai, Yong chang Liu^*, Zong qing Ma, Chong Li, Hui jun Li

^*Corresponding author for this work

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

13 Citations (Scopus)

Abstract

Ti₂AlNb-based alloys with 0.0wt%, 0.6wt%, and 2.0wt% carbon nanotube (CNT) addition were fabricated from spherical Ti–22Al–25Nb powder by sintering in the B₂ single-phase region. Phase identification and microstructural examination were performed to evaluate the effect of carbon addition on the hardness of the alloys. Carbon was either in a soluble state or in carbide form depending on its concentration. The acicular carbides formed around 1050°C were identified as TiC and facilitated the transformation of α₂ + B2 → O. The TiC was located within the acicular O phase. The surrounding O phase was distributed in certain orientations with angles of 65° or 90° O phase particles. The obtained alloy was composed of acicular O, Widmanstatten B2 + O, and acicular TiC. As a result of the precipitation of carbides as well as the O phase, the hardness of the alloy with 2.0wt% CNT addition increased to HV 429 ± 9.

Original language	English
Pages (from-to)	453-458
Number of pages	6
Journal	International Journal of Minerals, Metallurgy and Materials
Volume	25
Issue number	4
DOIs	https://doi.org/10.1007/s12613-018-1591-x
Publication status	Published - 1 Apr 2018
Externally published	Yes

Keywords

TiAlNb alloy
carbides
hardness
microstructure
precipitation hardening

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10.1007/s12613-018-1591-x

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title = "Evaluation of precipitation hardening in TiC-reinforced Ti2AlNb-based alloys",

abstract = "Ti2AlNb-based alloys with 0.0wt%, 0.6wt%, and 2.0wt% carbon nanotube (CNT) addition were fabricated from spherical Ti–22Al–25Nb powder by sintering in the B2 single-phase region. Phase identification and microstructural examination were performed to evaluate the effect of carbon addition on the hardness of the alloys. Carbon was either in a soluble state or in carbide form depending on its concentration. The acicular carbides formed around 1050°C were identified as TiC and facilitated the transformation of α2 + B2 → O. The TiC was located within the acicular O phase. The surrounding O phase was distributed in certain orientations with angles of 65° or 90° O phase particles. The obtained alloy was composed of acicular O, Widmanstatten B2 + O, and acicular TiC. As a result of the precipitation of carbides as well as the O phase, the hardness of the alloy with 2.0wt% CNT addition increased to HV 429 ± 9.",

keywords = "TiAlNb alloy, carbides, hardness, microstructure, precipitation hardening",

author = "Zhang, {Ya ran} and Qi Cai and Liu, {Yong chang} and Ma, {Zong qing} and Chong Li and Li, {Hui jun}",

note = "Publisher Copyright: {\textcopyright} 2018, University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature.",

year = "2018",

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doi = "10.1007/s12613-018-1591-x",

language = "English",

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TY - JOUR

T1 - Evaluation of precipitation hardening in TiC-reinforced Ti2AlNb-based alloys

AU - Zhang, Ya ran

AU - Cai, Qi

AU - Liu, Yong chang

AU - Ma, Zong qing

AU - Li, Chong

AU - Li, Hui jun

PY - 2018/4/1

Y1 - 2018/4/1

N2 - Ti2AlNb-based alloys with 0.0wt%, 0.6wt%, and 2.0wt% carbon nanotube (CNT) addition were fabricated from spherical Ti–22Al–25Nb powder by sintering in the B2 single-phase region. Phase identification and microstructural examination were performed to evaluate the effect of carbon addition on the hardness of the alloys. Carbon was either in a soluble state or in carbide form depending on its concentration. The acicular carbides formed around 1050°C were identified as TiC and facilitated the transformation of α2 + B2 → O. The TiC was located within the acicular O phase. The surrounding O phase was distributed in certain orientations with angles of 65° or 90° O phase particles. The obtained alloy was composed of acicular O, Widmanstatten B2 + O, and acicular TiC. As a result of the precipitation of carbides as well as the O phase, the hardness of the alloy with 2.0wt% CNT addition increased to HV 429 ± 9.

AB - Ti2AlNb-based alloys with 0.0wt%, 0.6wt%, and 2.0wt% carbon nanotube (CNT) addition were fabricated from spherical Ti–22Al–25Nb powder by sintering in the B2 single-phase region. Phase identification and microstructural examination were performed to evaluate the effect of carbon addition on the hardness of the alloys. Carbon was either in a soluble state or in carbide form depending on its concentration. The acicular carbides formed around 1050°C were identified as TiC and facilitated the transformation of α2 + B2 → O. The TiC was located within the acicular O phase. The surrounding O phase was distributed in certain orientations with angles of 65° or 90° O phase particles. The obtained alloy was composed of acicular O, Widmanstatten B2 + O, and acicular TiC. As a result of the precipitation of carbides as well as the O phase, the hardness of the alloy with 2.0wt% CNT addition increased to HV 429 ± 9.

KW - TiAlNb alloy

KW - carbides

KW - hardness

KW - microstructure

KW - precipitation hardening

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U2 - 10.1007/s12613-018-1591-x

DO - 10.1007/s12613-018-1591-x

M3 - Article

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SN - 1674-4799

VL - 25

SP - 453

EP - 458

JO - International Journal of Minerals, Metallurgy and Materials

JF - International Journal of Minerals, Metallurgy and Materials

IS - 4

ER -

Evaluation of precipitation hardening in TiC-reinforced Ti₂AlNb-based alloys

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