Solution treatment for enhanced hardness in Mo-modified Ti2AlNb-based alloys

Yaran Zhang; Qi Cai; Zongqing Ma; Chong Li; Liming Yu; Yongchang Liu

doi:10.1016/j.jallcom.2019.07.149

Solution treatment for enhanced hardness in Mo-modified Ti₂AlNb-based alloys

Yaran Zhang, Qi Cai, Zongqing Ma^*, Chong Li, Liming Yu, Yongchang Liu

^*Corresponding author for this work

School of Material Science and Engineering

Tianjin University

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

39 Citations (Scopus)

Abstract

The present work investigates the change in the microstructure and the improvement in the microhardness in the Mo-modified Ti₂AlNb alloys induced by solution treatment. Typical Widmanstätten O + B2 structure was observed in the alloys directly aged in the O + B2 phase region, with a lower hardness value compared to that of the alloy without Mo addition. Well-arranged O + B2 colonies were observed in the specimen solution treated in single B2 phase region, and it exhibited a favorable hardness performance of up to 620 HV. Besides the precipitation hardening of the O phase, the solution of Mo in B2 phase should be responsible for the enhancement of hardness. Further microstructural observation proved that the substitution of Mo for Nb in the lattice of B2 phase induced the lattice distortion mainly the (200) and (211) planes, and the induced entanglement of dislocations also contributed to the enhancement of hardness.

Original language	English
Pages (from-to)	1184-1190
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	805
DOIs	https://doi.org/10.1016/j.jallcom.2019.07.149
Publication status	Published - 15 Oct 2019

Keywords

Hardness
Microstructure
Mo addition
Solution treatment
TiAlNb alloys

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10.1016/j.jallcom.2019.07.149

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@article{63d31c25598c4066a98ec9cb2890def7,

title = "Solution treatment for enhanced hardness in Mo-modified Ti2AlNb-based alloys",

abstract = "The present work investigates the change in the microstructure and the improvement in the microhardness in the Mo-modified Ti2AlNb alloys induced by solution treatment. Typical Widmanst{\"a}tten O + B2 structure was observed in the alloys directly aged in the O + B2 phase region, with a lower hardness value compared to that of the alloy without Mo addition. Well-arranged O + B2 colonies were observed in the specimen solution treated in single B2 phase region, and it exhibited a favorable hardness performance of up to 620 HV. Besides the precipitation hardening of the O phase, the solution of Mo in B2 phase should be responsible for the enhancement of hardness. Further microstructural observation proved that the substitution of Mo for Nb in the lattice of B2 phase induced the lattice distortion mainly the (200) and (211) planes, and the induced entanglement of dislocations also contributed to the enhancement of hardness.",

keywords = "Hardness, Microstructure, Mo addition, Solution treatment, TiAlNb alloys",

author = "Yaran Zhang and Qi Cai and Zongqing Ma and Chong Li and Liming Yu and Yongchang Liu",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

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day = "15",

doi = "10.1016/j.jallcom.2019.07.149",

language = "English",

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TY - JOUR

T1 - Solution treatment for enhanced hardness in Mo-modified Ti2AlNb-based alloys

AU - Zhang, Yaran

AU - Cai, Qi

AU - Ma, Zongqing

AU - Li, Chong

AU - Yu, Liming

AU - Liu, Yongchang

PY - 2019/10/15

Y1 - 2019/10/15

N2 - The present work investigates the change in the microstructure and the improvement in the microhardness in the Mo-modified Ti2AlNb alloys induced by solution treatment. Typical Widmanstätten O + B2 structure was observed in the alloys directly aged in the O + B2 phase region, with a lower hardness value compared to that of the alloy without Mo addition. Well-arranged O + B2 colonies were observed in the specimen solution treated in single B2 phase region, and it exhibited a favorable hardness performance of up to 620 HV. Besides the precipitation hardening of the O phase, the solution of Mo in B2 phase should be responsible for the enhancement of hardness. Further microstructural observation proved that the substitution of Mo for Nb in the lattice of B2 phase induced the lattice distortion mainly the (200) and (211) planes, and the induced entanglement of dislocations also contributed to the enhancement of hardness.

AB - The present work investigates the change in the microstructure and the improvement in the microhardness in the Mo-modified Ti2AlNb alloys induced by solution treatment. Typical Widmanstätten O + B2 structure was observed in the alloys directly aged in the O + B2 phase region, with a lower hardness value compared to that of the alloy without Mo addition. Well-arranged O + B2 colonies were observed in the specimen solution treated in single B2 phase region, and it exhibited a favorable hardness performance of up to 620 HV. Besides the precipitation hardening of the O phase, the solution of Mo in B2 phase should be responsible for the enhancement of hardness. Further microstructural observation proved that the substitution of Mo for Nb in the lattice of B2 phase induced the lattice distortion mainly the (200) and (211) planes, and the induced entanglement of dislocations also contributed to the enhancement of hardness.

KW - Hardness

KW - Microstructure

KW - Mo addition

KW - Solution treatment

KW - TiAlNb alloys

UR - http://www.scopus.com/inward/record.url?scp=85069690120&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2019.07.149

DO - 10.1016/j.jallcom.2019.07.149

M3 - Article

AN - SCOPUS:85069690120

SN - 0925-8388

VL - 805

SP - 1184

EP - 1190

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Solution treatment for enhanced hardness in Mo-modified Ti₂AlNb-based alloys

Abstract

Keywords

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