Revisiting ω phase embrittlement in metastable β titanium alloys: Role of elemental partitioning

M. J. Lai; T. Li; F. K. Yan; J. S. Li; D. Raabe

doi:10.1016/j.scriptamat.2020.10.031

Revisiting ω phase embrittlement in metastable β titanium alloys: Role of elemental partitioning

M. J. Lai, T. Li, F. K. Yan, J. S. Li, D. Raabe

School of Materials Sience and Engineering

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

48 Scopus citations

Abstract

The role of elemental partitioning between β and ω phase in embrittling an originally ductile ω-containing Ti–12Mo (wt.%) model alloy was studied using transmission electron microscopy and atom probe tomography. It is revealed that the embrittlement of this alloy already occurs after aging at 400 °C for as short as 10 min, when the size, inter-particle spacing and volume fraction of the ω particles remain almost unchanged. The origin of the aging-induced embrittlement is attributed to the significant rejection of Mo (>5 at.%) from the ω particles during aging, which leads to remarkable increase in the shear modulus (>30 GPa) of the ω particles, promoting intense plastic flow localization and facilitating crack nucleation prior to macroscopic yielding.

Original language	English
Pages (from-to)	38-42
Number of pages	5
Journal	Scripta Materialia
Volume	193
DOIs	https://doi.org/10.1016/j.scriptamat.2020.10.031
State	Published - 1 Mar 2021

Keywords

Atom probe tomography
Embrittlement
Titanium alloys
Transmission electron microscopy
ω phase

Access to Document

10.1016/j.scriptamat.2020.10.031

Cite this

@article{3dae7ea5fac447e09c3b44eaf0bc5fd7,

title = "Revisiting ω phase embrittlement in metastable β titanium alloys: Role of elemental partitioning",

abstract = "The role of elemental partitioning between β and ω phase in embrittling an originally ductile ω-containing Ti–12Mo (wt.\%) model alloy was studied using transmission electron microscopy and atom probe tomography. It is revealed that the embrittlement of this alloy already occurs after aging at 400 °C for as short as 10 min, when the size, inter-particle spacing and volume fraction of the ω particles remain almost unchanged. The origin of the aging-induced embrittlement is attributed to the significant rejection of Mo (>5 at.\%) from the ω particles during aging, which leads to remarkable increase in the shear modulus (>30 GPa) of the ω particles, promoting intense plastic flow localization and facilitating crack nucleation prior to macroscopic yielding.",

keywords = "Atom probe tomography, Embrittlement, Titanium alloys, Transmission electron microscopy, ω phase",

author = "Lai, \{M. J.\} and T. Li and Yan, \{F. K.\} and Li, \{J. S.\} and D. Raabe",

note = "Publisher Copyright: {\textcopyright} 2020",

year = "2021",

month = mar,

day = "1",

doi = "10.1016/j.scriptamat.2020.10.031",

language = "英语",

volume = "193",

pages = "38--42",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Acta Materialia Inc",

}

TY - JOUR

T1 - Revisiting ω phase embrittlement in metastable β titanium alloys

T2 - Role of elemental partitioning

AU - Lai, M. J.

AU - Li, T.

AU - Yan, F. K.

AU - Li, J. S.

AU - Raabe, D.

PY - 2021/3/1

Y1 - 2021/3/1

N2 - The role of elemental partitioning between β and ω phase in embrittling an originally ductile ω-containing Ti–12Mo (wt.%) model alloy was studied using transmission electron microscopy and atom probe tomography. It is revealed that the embrittlement of this alloy already occurs after aging at 400 °C for as short as 10 min, when the size, inter-particle spacing and volume fraction of the ω particles remain almost unchanged. The origin of the aging-induced embrittlement is attributed to the significant rejection of Mo (>5 at.%) from the ω particles during aging, which leads to remarkable increase in the shear modulus (>30 GPa) of the ω particles, promoting intense plastic flow localization and facilitating crack nucleation prior to macroscopic yielding.

AB - The role of elemental partitioning between β and ω phase in embrittling an originally ductile ω-containing Ti–12Mo (wt.%) model alloy was studied using transmission electron microscopy and atom probe tomography. It is revealed that the embrittlement of this alloy already occurs after aging at 400 °C for as short as 10 min, when the size, inter-particle spacing and volume fraction of the ω particles remain almost unchanged. The origin of the aging-induced embrittlement is attributed to the significant rejection of Mo (>5 at.%) from the ω particles during aging, which leads to remarkable increase in the shear modulus (>30 GPa) of the ω particles, promoting intense plastic flow localization and facilitating crack nucleation prior to macroscopic yielding.

KW - Atom probe tomography

KW - Embrittlement

KW - Titanium alloys

KW - Transmission electron microscopy

KW - ω phase

UR - https://www.scopus.com/pages/publications/85093952786

U2 - 10.1016/j.scriptamat.2020.10.031

DO - 10.1016/j.scriptamat.2020.10.031

M3 - 文章

AN - SCOPUS:85093952786

SN - 1359-6462

VL - 193

SP - 38

EP - 42

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Revisiting ω phase embrittlement in metastable β titanium alloys: Role of elemental partitioning

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this