Titanium's high-temperature elastic constants through the hcp-bcc phase transformation

Ogi, Hirotsugu; Kai, Satoshi; Ledbetter, Hassel et al.

Acta Materialia, 2004, 52(7), 2075-2080

Number of Access:212（2025-05-31 09:04 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/84188

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Title
Titanium's high-temperature elastic constants through the hcp-bcc phase transformation
Creator
NRID
1000090252626 1000090252626
researchmap permalink
read0042771 read0042771
Scopus Author ID
35563683500 35563683500
CreatorName
Ogi, Hirotsugu
CreatorName
Kai, Satoshi
CreatorName
Ledbetter, Hassel
NRID
1000030362643 1000030362643
researchmap permalink
ryuichitarumi ryuichitarumi
Scopus Author ID
6602531674 6602531674
CreatorName
Tarumi, Ryuichi
NRID
1000080112027 1000080112027
CreatorName
Hirao, Masahiko
NRID
1000060163193 1000060163193
CreatorName
Takashima, Kazuki
Subject
Acoustic methods
Elastic behavior
Martensitic phase transformation
Strain ageing
Titanium
Abstract
The five independent elastic constants of hexagonal monocrystal titanium were determined up to the phase-transformation temperature, and the two isotropic elastic constants of polycrystalline titanium were determined beyond, up to 1300 K. Anomalous temperature dependences were observed just below the phase-transformation temperature: C11 and C66 increase with increasing temperature whereas C33 and C44 remarkably decrease, for example. To determine the Cij, we used the free-vibration resonance frequencies obtained by electromagnetic acoustic resonance. After the phase transformation, the resonance frequencies changed little with the temperature increase, showing that the bcc-phase elastic constants change little with temperature. The polycrystalline elastic constants remained unchanged up to 1300 K after the phase transformation. The anomalous temperature dependence near the transformation is interpreted in terms of the small c/a ratio of the hcp phase and change of the atomic distances to meet the Burgers lattice relationship. Temperature-insensitive elastic constants in the bcc phase suggest the stabilizing of the bcc phase with increasing temperature. © 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Publisher
Elsevier Ltd
Source Title
Acta Materialia
Volume (Issue)
52(7)
Page
2075-2080
Date of Issued
2004-01-25
Language
English
Handle URL
https://hdl.handle.net/11094/84188
PISSN
13596454
NCID
AA11521780
AA1106787X
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1016/j.actamat.2004.01.002
Access Rights
open access
CopyRight
© 2004 Acta Materialia Inc. Published by Elsevier Ltd. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article