A new beta titanium alloy system reinforced with superlattice intermetallic precipitates

Alexander J. Knowles; Tea Sung Jun; Ayan Bhowmik; Nicholas G. Jones; T. Ben Britton; Finn Giuliani; Howard J. Stone; David Dye

doi:10.1016/j.scriptamat.2017.06.038

A new beta titanium alloy system reinforced with superlattice intermetallic precipitates

Alexander J. Knowles^*, Tea Sung Jun, Ayan Bhowmik, Nicholas G. Jones, T. Ben Britton, Finn Giuliani, Howard J. Stone, David Dye

^*Corresponding author for this work

Metallurgy and Materials

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

10 Citations (Scopus)

Abstract

Titanium alloys traditionally lack a nm-scale intermetallic precipitate that can be exploited for age-hardening from solid solution. Here such a strengthening concept is developed in the Ti-Fe-Mo system, with it being found that a high temperature β (bcc A2) single-phase field for homogenisation can be obtained, which following ageing (750 °C/80 h) precipitated B2 TiFe <100 nm in size. The orientation relationship was found to be ⟨100⟩_A2//⟨100⟩_B2, {100}_A2//{100}_B2, with a misfit of −6.1%. The alloy was found to be very hard (HV_0.5 = 6.4 GPa) and strong (σ_{y, 0.2} = 1.9 GPa) with a density of 6.68 g cm⁻³. TEM observation and micropillar deformation showed that the precipitates resist dislocation cutting.

Original language	English
Pages (from-to)	71-75
Number of pages	5
Journal	Scripta Materialia
Volume	140
Early online date	14 Jul 2017
DOIs	https://doi.org/10.1016/j.scriptamat.2017.06.038
Publication status	Published - 1 Nov 2017

Keywords

Dislocations
Mechanical properties
Microstructure
Precipitation
Titanium alloys

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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https://spiral.imperial.ac.uk/handle/10044/1/49608

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title = "A new beta titanium alloy system reinforced with superlattice intermetallic precipitates",

abstract = "Titanium alloys traditionally lack a nm-scale intermetallic precipitate that can be exploited for age-hardening from solid solution. Here such a strengthening concept is developed in the Ti-Fe-Mo system, with it being found that a high temperature β (bcc A2) single-phase field for homogenisation can be obtained, which following ageing (750 °C/80 h) precipitated B2 TiFe <100 nm in size. The orientation relationship was found to be ⟨100⟩A2//⟨100⟩B2, {100}A2//{100}B2, with a misfit of −6.1%. The alloy was found to be very hard (HV0.5 = 6.4 GPa) and strong (σy, 0.2 = 1.9 GPa) with a density of 6.68 g cm−3. TEM observation and micropillar deformation showed that the precipitates resist dislocation cutting.",

keywords = "Dislocations, Mechanical properties, Microstructure, Precipitation, Titanium alloys",

author = "Knowles, {Alexander J.} and Jun, {Tea Sung} and Ayan Bhowmik and Jones, {Nicholas G.} and Britton, {T. Ben} and Finn Giuliani and Stone, {Howard J.} and David Dye",

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doi = "10.1016/j.scriptamat.2017.06.038",

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T1 - A new beta titanium alloy system reinforced with superlattice intermetallic precipitates

AU - Knowles, Alexander J.

AU - Jun, Tea Sung

AU - Bhowmik, Ayan

AU - Jones, Nicholas G.

AU - Britton, T. Ben

AU - Giuliani, Finn

AU - Stone, Howard J.

AU - Dye, David

PY - 2017/11/1

Y1 - 2017/11/1

N2 - Titanium alloys traditionally lack a nm-scale intermetallic precipitate that can be exploited for age-hardening from solid solution. Here such a strengthening concept is developed in the Ti-Fe-Mo system, with it being found that a high temperature β (bcc A2) single-phase field for homogenisation can be obtained, which following ageing (750 °C/80 h) precipitated B2 TiFe <100 nm in size. The orientation relationship was found to be ⟨100⟩A2//⟨100⟩B2, {100}A2//{100}B2, with a misfit of −6.1%. The alloy was found to be very hard (HV0.5 = 6.4 GPa) and strong (σy, 0.2 = 1.9 GPa) with a density of 6.68 g cm−3. TEM observation and micropillar deformation showed that the precipitates resist dislocation cutting.

AB - Titanium alloys traditionally lack a nm-scale intermetallic precipitate that can be exploited for age-hardening from solid solution. Here such a strengthening concept is developed in the Ti-Fe-Mo system, with it being found that a high temperature β (bcc A2) single-phase field for homogenisation can be obtained, which following ageing (750 °C/80 h) precipitated B2 TiFe <100 nm in size. The orientation relationship was found to be ⟨100⟩A2//⟨100⟩B2, {100}A2//{100}B2, with a misfit of −6.1%. The alloy was found to be very hard (HV0.5 = 6.4 GPa) and strong (σy, 0.2 = 1.9 GPa) with a density of 6.68 g cm−3. TEM observation and micropillar deformation showed that the precipitates resist dislocation cutting.

KW - Dislocations

KW - Mechanical properties

KW - Microstructure

KW - Precipitation

KW - Titanium alloys

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DO - 10.1016/j.scriptamat.2017.06.038

M3 - Article

AN - SCOPUS:85023601615

SN - 1359-6462

VL - 140

SP - 71

EP - 75

JO - Scripta Materialia

JF - Scripta Materialia

ER -

A new beta titanium alloy system reinforced with superlattice intermetallic precipitates

Abstract

Keywords

ASJC Scopus subject areas

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