The effect of alloy composition on instabilities in the β phase of titanium alloys

Yufeng Zheng; Robert E.A. Williams; Soumya Nag; Rajarshi Banerjee; Hamish L. Fraser; Dipankar Banerjee

doi:10.1016/j.scriptamat.2016.01.024

The effect of alloy composition on instabilities in the β phase of titanium alloys

Yufeng Zheng, Robert E.A. Williams, Soumya Nag, Rajarshi Banerjee, Hamish L. Fraser, Dipankar Banerjee

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

119 Scopus citations

Abstract

A metastable nano-scale disordered precipitate with orthorhombic symmetry has been identified using high resolution scanning transmission electron microscopy. The phase, termed O′, is metastable, formed by a shuffle mechanism involving a {110}<11¯0> transverse phonon wave in samples of Ti-26Nb-2Zr (at.%) quenched from the β phase. The addition of 2% Zr to Ti-26Nb appears to suppress significantly the stability of both the {112¯}<111> shear and 2/3 < 111 > longitudinal phonon wave but promotes the {110}<11¯0> transverse shuffle. This results in the nano-size O′ phase being homogeneously formed in the parent β phase matrix rather than the massive α″ phase.

Original language	English
Pages (from-to)	49-52
Number of pages	4
Journal	Scripta Materialia
Volume	116
DOIs	https://doi.org/10.1016/j.scriptamat.2016.01.024
State	Published - Apr 15 2016
Externally published	Yes

Funding

The support of this research by the National Science Foundation , under grant DMR-1309270 , is very gratefully acknowledged. One of us, DB, gratefully acknowledges a visiting fellowship from the University of North Texas during which this research was initiated.

Keywords

High-resolution electron microscopy
Martensite
Phase transformations
Titanium alloys

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10.1016/j.scriptamat.2016.01.024

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title = "The effect of alloy composition on instabilities in the β phase of titanium alloys",

abstract = "A metastable nano-scale disordered precipitate with orthorhombic symmetry has been identified using high resolution scanning transmission electron microscopy. The phase, termed O′, is metastable, formed by a shuffle mechanism involving a {110}<11¯0> transverse phonon wave in samples of Ti-26Nb-2Zr (at.%) quenched from the β phase. The addition of 2% Zr to Ti-26Nb appears to suppress significantly the stability of both the {112¯}<111> shear and 2/3 < 111 > longitudinal phonon wave but promotes the {110}<11¯0> transverse shuffle. This results in the nano-size O′ phase being homogeneously formed in the parent β phase matrix rather than the massive α″ phase.",

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AU - Zheng, Yufeng

AU - Williams, Robert E.A.

AU - Nag, Soumya

AU - Banerjee, Rajarshi

AU - Fraser, Hamish L.

AU - Banerjee, Dipankar

PY - 2016/4/15

Y1 - 2016/4/15

N2 - A metastable nano-scale disordered precipitate with orthorhombic symmetry has been identified using high resolution scanning transmission electron microscopy. The phase, termed O′, is metastable, formed by a shuffle mechanism involving a {110}<11¯0> transverse phonon wave in samples of Ti-26Nb-2Zr (at.%) quenched from the β phase. The addition of 2% Zr to Ti-26Nb appears to suppress significantly the stability of both the {112¯}<111> shear and 2/3 < 111 > longitudinal phonon wave but promotes the {110}<11¯0> transverse shuffle. This results in the nano-size O′ phase being homogeneously formed in the parent β phase matrix rather than the massive α″ phase.

AB - A metastable nano-scale disordered precipitate with orthorhombic symmetry has been identified using high resolution scanning transmission electron microscopy. The phase, termed O′, is metastable, formed by a shuffle mechanism involving a {110}<11¯0> transverse phonon wave in samples of Ti-26Nb-2Zr (at.%) quenched from the β phase. The addition of 2% Zr to Ti-26Nb appears to suppress significantly the stability of both the {112¯}<111> shear and 2/3 < 111 > longitudinal phonon wave but promotes the {110}<11¯0> transverse shuffle. This results in the nano-size O′ phase being homogeneously formed in the parent β phase matrix rather than the massive α″ phase.

KW - High-resolution electron microscopy

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KW - Phase transformations

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The effect of alloy composition on instabilities in the β phase of titanium alloys

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