Nanoprecipitation in a beta-titanium alloy

James Coakley; Vassili A. Vorontsov; Kenneth C. Littrell; Richard K. Heenan; Masato Ohnuma; Nicholas G. Jones; David Dye

doi:10.1016/j.jallcom.2014.10.038

Nanoprecipitation in a beta-titanium alloy

James Coakley, Vassili A. Vorontsov, Kenneth C. Littrell, Richard K. Heenan, Masato Ohnuma, Nicholas G. Jones, David Dye

Instrument Development Group

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52 Scopus citations

Abstract

This paper represents the first application of small angle neutron scattering (SANS) to the study of precipitate nucleation and growth in β-Ti alloys in an attempt to observe both the precipitation process in-situ and to quantify the evolving microstructure that affects mechanical behaviour. TEM suggests that athermal ω can be induced by cold-rolling Gum metal, a β-Ti alloy. During thermal exposure at 400°C, isothermal ω particles precipitate at a greater rate in cold-rolled material than in the recovered, hot deformed state. SANS modelling is consistent with disc shaped nanoparticles, with length and radius under 6nm after thermal exposures up to 16h. Modelling suggests that the nanoprecipitate volume fraction and extent of Nb partitioning to the β matrix is greater in the cold-rolled material than the extruded. The results show that nucleation and growth of the nanoprecipitates impart strengthening to the alloy.

Original language	English
Pages (from-to)	146-156
Number of pages	11
Journal	Journal of Alloys and Compounds
Volume	623
DOIs	https://doi.org/10.1016/j.jallcom.2014.10.038
State	Published - Feb 25 2015

Bibliographical note

Publisher Copyright:
© 2014 Elsevier B.V.

Funding

JC, VV, NGJ and DD would like to acknowledge funding from EPSRC under grant EP/H0004882/01. JC and MO would also like to acknowledge fellowship funding provided by JSPS . This work utilizes the Oak Ridge National Laboratory’s High Flux Isotope Reactor, which is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy . We would like to thank Matthias Knop at Imperial, Mark Ward at the University of Birmingham and Richard Dashwood at Warwick University for their help with sample manufacture and preparation.

Funders	Funder number
Oak Ridge National Laboratory
Office of Basic Energy Sciences
Scientific User Facilities Division
U.S. Department of Energy
Engineering and Physical Sciences Research Council	EP/L025213/1, EP/H0004882/01
Japan Society for the Promotion of Science	24360296

Keywords

Metals and alloys
Neutron scattering
Precipitation Transmission Electron Microscopy, TEM
Titanium alloys

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10.1016/j.jallcom.2014.10.038

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title = "Nanoprecipitation in a beta-titanium alloy",

abstract = "This paper represents the first application of small angle neutron scattering (SANS) to the study of precipitate nucleation and growth in β-Ti alloys in an attempt to observe both the precipitation process in-situ and to quantify the evolving microstructure that affects mechanical behaviour. TEM suggests that athermal ω can be induced by cold-rolling Gum metal, a β-Ti alloy. During thermal exposure at 400°C, isothermal ω particles precipitate at a greater rate in cold-rolled material than in the recovered, hot deformed state. SANS modelling is consistent with disc shaped nanoparticles, with length and radius under 6nm after thermal exposures up to 16h. Modelling suggests that the nanoprecipitate volume fraction and extent of Nb partitioning to the β matrix is greater in the cold-rolled material than the extruded. The results show that nucleation and growth of the nanoprecipitates impart strengthening to the alloy.",

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AU - Coakley, James

AU - Vorontsov, Vassili A.

AU - Littrell, Kenneth C.

AU - Heenan, Richard K.

AU - Ohnuma, Masato

AU - Jones, Nicholas G.

AU - Dye, David

PY - 2015/2/25

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N2 - This paper represents the first application of small angle neutron scattering (SANS) to the study of precipitate nucleation and growth in β-Ti alloys in an attempt to observe both the precipitation process in-situ and to quantify the evolving microstructure that affects mechanical behaviour. TEM suggests that athermal ω can be induced by cold-rolling Gum metal, a β-Ti alloy. During thermal exposure at 400°C, isothermal ω particles precipitate at a greater rate in cold-rolled material than in the recovered, hot deformed state. SANS modelling is consistent with disc shaped nanoparticles, with length and radius under 6nm after thermal exposures up to 16h. Modelling suggests that the nanoprecipitate volume fraction and extent of Nb partitioning to the β matrix is greater in the cold-rolled material than the extruded. The results show that nucleation and growth of the nanoprecipitates impart strengthening to the alloy.

AB - This paper represents the first application of small angle neutron scattering (SANS) to the study of precipitate nucleation and growth in β-Ti alloys in an attempt to observe both the precipitation process in-situ and to quantify the evolving microstructure that affects mechanical behaviour. TEM suggests that athermal ω can be induced by cold-rolling Gum metal, a β-Ti alloy. During thermal exposure at 400°C, isothermal ω particles precipitate at a greater rate in cold-rolled material than in the recovered, hot deformed state. SANS modelling is consistent with disc shaped nanoparticles, with length and radius under 6nm after thermal exposures up to 16h. Modelling suggests that the nanoprecipitate volume fraction and extent of Nb partitioning to the β matrix is greater in the cold-rolled material than the extruded. The results show that nucleation and growth of the nanoprecipitates impart strengthening to the alloy.

KW - Metals and alloys

KW - Neutron scattering

KW - Precipitation Transmission Electron Microscopy, TEM

KW - Titanium alloys

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JF - Journal of Alloys and Compounds

ER -

Nanoprecipitation in a beta-titanium alloy

Abstract

Bibliographical note

Funding

Keywords

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