Influence of oxygen on omega phase stability in the Ti-29Nb-13Ta-4.6Zr alloy

Mitsuo Niinomi; Masaaki Nakai; Mandana Hendrickson; Peeyush Nandwana; Talukder Alam; Deep Choudhuri; Rajarshi Banerjee

doi:10.1016/j.scriptamat.2016.06.027

Influence of oxygen on omega phase stability in the Ti-29Nb-13Ta-4.6Zr alloy

Mitsuo Niinomi, Masaaki Nakai, Mandana Hendrickson, Peeyush Nandwana, Talukder Alam, Deep Choudhuri, Rajarshi Banerjee

Materials Development Division

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

47 Citations (Scopus)

Abstract

The effect of oxygen on stability of isothermal omega precipitates in Ti-29Nb-13Ta-4.6Zr was examined using X-ray powder diffraction, transmission electron microscopy, and atom probe tomography. Two alloys with 0.1 and 0.4 mass% oxygen were subjected to single step, and two-step annealing heat-treatments to respectively promote omega and alpha formation. After second step annealing, large volume fraction of omega precipitates was retained in 0.4 mass% O alloy while mainly alpha phase was observed in TNTZ-0.1O. The enhanced stability of omega in the higher oxygen containing TNTZ alloys questions the conventionally accepted understanding that oxygen destabilizes the omega phase in titanium alloys.

Original language	English
Pages (from-to)	144-148
Number of pages	5
Journal	Scripta Materialia
Volume	123
DOIs	https://doi.org/10.1016/j.scriptamat.2016.06.027
Publication status	Published - 2016 Oct 1

Keywords

Atom probe tomography
Omega phase
Oxygen
Phase stability
β-titanium alloy

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2016.06.027

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title = "Influence of oxygen on omega phase stability in the Ti-29Nb-13Ta-4.6Zr alloy",

abstract = "The effect of oxygen on stability of isothermal omega precipitates in Ti-29Nb-13Ta-4.6Zr was examined using X-ray powder diffraction, transmission electron microscopy, and atom probe tomography. Two alloys with 0.1 and 0.4 mass% oxygen were subjected to single step, and two-step annealing heat-treatments to respectively promote omega and alpha formation. After second step annealing, large volume fraction of omega precipitates was retained in 0.4 mass% O alloy while mainly alpha phase was observed in TNTZ-0.1O. The enhanced stability of omega in the higher oxygen containing TNTZ alloys questions the conventionally accepted understanding that oxygen destabilizes the omega phase in titanium alloys.",

keywords = "Atom probe tomography, Omega phase, Oxygen, Phase stability, β-titanium alloy",

author = "Mitsuo Niinomi and Masaaki Nakai and Mandana Hendrickson and Peeyush Nandwana and Talukder Alam and Deep Choudhuri and Rajarshi Banerjee",

year = "2016",

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doi = "10.1016/j.scriptamat.2016.06.027",

language = "English",

volume = "123",

pages = "144--148",

journal = "Scripta Materialia",

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TY - JOUR

T1 - Influence of oxygen on omega phase stability in the Ti-29Nb-13Ta-4.6Zr alloy

AU - Niinomi, Mitsuo

AU - Nakai, Masaaki

AU - Hendrickson, Mandana

AU - Nandwana, Peeyush

AU - Alam, Talukder

AU - Choudhuri, Deep

AU - Banerjee, Rajarshi

PY - 2016/10/1

Y1 - 2016/10/1

N2 - The effect of oxygen on stability of isothermal omega precipitates in Ti-29Nb-13Ta-4.6Zr was examined using X-ray powder diffraction, transmission electron microscopy, and atom probe tomography. Two alloys with 0.1 and 0.4 mass% oxygen were subjected to single step, and two-step annealing heat-treatments to respectively promote omega and alpha formation. After second step annealing, large volume fraction of omega precipitates was retained in 0.4 mass% O alloy while mainly alpha phase was observed in TNTZ-0.1O. The enhanced stability of omega in the higher oxygen containing TNTZ alloys questions the conventionally accepted understanding that oxygen destabilizes the omega phase in titanium alloys.

AB - The effect of oxygen on stability of isothermal omega precipitates in Ti-29Nb-13Ta-4.6Zr was examined using X-ray powder diffraction, transmission electron microscopy, and atom probe tomography. Two alloys with 0.1 and 0.4 mass% oxygen were subjected to single step, and two-step annealing heat-treatments to respectively promote omega and alpha formation. After second step annealing, large volume fraction of omega precipitates was retained in 0.4 mass% O alloy while mainly alpha phase was observed in TNTZ-0.1O. The enhanced stability of omega in the higher oxygen containing TNTZ alloys questions the conventionally accepted understanding that oxygen destabilizes the omega phase in titanium alloys.

KW - Atom probe tomography

KW - Omega phase

KW - Oxygen

KW - Phase stability

KW - β-titanium alloy

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DO - 10.1016/j.scriptamat.2016.06.027

M3 - Article

AN - SCOPUS:84976585894

SN - 1359-6462

VL - 123

SP - 144

EP - 148

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Influence of oxygen on omega phase stability in the Ti-29Nb-13Ta-4.6Zr alloy

Abstract

Keywords

ASJC Scopus subject areas

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