Activation of Homogeneous Precursors for Formation of Uniform and Refined α Precipitates in a High-strength β-Ti Alloy

Wenlong Xiao; Matthew S Dargusch; Damon Kent; Xinqing Zhao; Chaoli Ma

doi:10.1016/j.mtla.2019.100557

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Activation of Homogeneous Precursors for Formation of Uniform and Refined α Precipitates in a High-strength β-Ti Alloy

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Activation of Homogeneous Precursors for Formation of Uniform and Refined α Precipitates in a High-strength β-Ti Alloy

Wenlong Xiao, Matthew S Dargusch, Damon Kent, Xinqing Zhao and Chaoli Ma

Materialia, Vol.9, 100557

2020

DOI: https://doi.org/10.1016/j.mtla.2019.100557

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Abstract

titanium alloys

phase transformation kinetics

nucleation

precipitation

spinodal decomposition

The influence of heating rates and interrupted aging treatments on α precipitation in the β-quenched Ti-6Cr-5Mo-5V-4Al alloy have been investigated. Microstructure observations reveal that slow heating rates and low temperature pre-aging produce much refined and uniform distributions of intragranular α precipitates in comparison to aging using fast heating rates at a high temperature only. For interrupted aging treatments, the nucleation rate and refinement of α are gradually enhanced with increasing pre-aging time, but this is dependent on the final aging temperature: at high final aging temperatures, the distribution of α precipitates is similar to single aging at the same temperature. The kinetics of phase transformation were analyzed by thermal mechanical analysis (TMA) under the framework of the Johnson-Mehl-Avrami (JMA) theory. Coupled with microstructural observations, it is suggested that epitaxial growth of pre-existing α phase formed during heating to the aging temperature is the governing mechanism under slow heating rate conditions, while for interrupted aging treatments, the mechanism for intergranular α precipitation is consistent with that of fast heating rate single temperature aging treatments. For interrupted aging, the formation of uniform and refined α precipitates essentially relies on activation of homogeneous precursors associated with chemical partitioning and structural modulation which provide a strong driving force for nucleation of α.

Details

Title: Activation of Homogeneous Precursors for Formation of Uniform and Refined α Precipitates in a High-strength β-Ti Alloy
Authors: Wenlong Xiao (Author) - Beihang University, China
Matthew S Dargusch (Author) - University of Queensland
Damon Kent (Author) - University of the Sunshine Coast - School of Science & Engineering
Xinqing Zhao (Author) - Beihang University, China
Chaoli Ma (Author) - Beihang University, China
Publication details: Materialia, Vol.9, 100557
Publisher: Elsevier Ltd.
Date published: 2020
DOI: 10.1016/j.mtla.2019.100557
ISSN: 2589-1529
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99450813202621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Materials Science, Multidisciplinary