An Investigation into the Microstructural Response of a BEPM Metastable β-Phase Ti Alloy to Flexural Stresses

Ryan Naseri; David R.G. Mitchell; Azdiar A. Gazder; Frank Niessen; Mitchell Nancarrow; Dmytro G. Savvakin; Elena Pereloma

doi:10.1002/adem.202300350

An Investigation into the Microstructural Response of a BEPM Metastable β-Phase Ti Alloy to Flexural Stresses

Ryan Naseri, David R.G. Mitchell, Azdiar A. Gazder, Frank Niessen, Mitchell Nancarrow, Dmytro G. Savvakin, Elena Pereloma^*

^*Corresponding author for this work

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Abstract

A Ti-10V-3Al-3Fe metastable β Ti alloy was strained under three-point bending conditions according to the ASTM E290-14 standard. A combination of electron backscatter diffraction (EBSD) mapping and high-resolution scanning transmission electron microscopy (STEM) was used to investigate the microstructural response to flexural stress. Results reveal a delayed formation of the deformation products, due to the load-bearing capacity of the constituent voids. The deformation products are confined in narrow bands on either side of the fracture surface. 332⟨113⟩ twinning system is identified as the primary deformation mode followed by the formation of α″ martensite both in β matrix and β twins. Accommodation of the microscopic strain arising from the development of α″ structure and β-twinning triggers the formation of fine deformation-induced ω plates, which are observed predominantly at the interfacial plane of β/β_twin and β/α″, and also in the interior of the β twins.

Original language	English
Article number	2300350
Journal	Advanced Engineering Materials
Volume	26
Issue number	4
ISSN	1438-1656
DOIs	https://doi.org/10.1002/adem.202300350
Publication status	Published - 2024

Keywords

Ti alloy
Deformation-induced phase transformation
Transmission electron microscopy
Electron back-scattering diffraction
Twinning
Martensitic transformation

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title = "An Investigation into the Microstructural Response of a BEPM Metastable β-Phase Ti Alloy to Flexural Stresses",

abstract = "A Ti-10V-3Al-3Fe metastable β Ti alloy was strained under three-point bending conditions according to the ASTM E290-14 standard. A combination of electron backscatter diffraction (EBSD) mapping and high-resolution scanning transmission electron microscopy (STEM) was used to investigate the microstructural response to flexural stress. Results reveal a delayed formation of the deformation products, due to the load-bearing capacity of the constituent voids. The deformation products are confined in narrow bands on either side of the fracture surface. 332⟨113⟩ twinning system is identified as the primary deformation mode followed by the formation of α″ martensite both in β matrix and β twins. Accommodation of the microscopic strain arising from the development of α″ structure and β-twinning triggers the formation of fine deformation-induced ω plates, which are observed predominantly at the interfacial plane of β/βtwin and β/α″, and also in the interior of the β twins. ",

keywords = "Ti alloy, Deformation-induced phase transformation, Transmission electron microscopy, Electron back-scattering diffraction, Twinning, Martensitic transformation",

author = "Ryan Naseri and Mitchell, {David R.G.} and Gazder, {Azdiar A.} and Frank Niessen and Mitchell Nancarrow and Savvakin, {Dmytro G.} and Elena Pereloma",

year = "2024",

doi = "10.1002/adem.202300350",

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journal = "Advanced Engineering Materials",

issn = "1438-1656",

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T1 - An Investigation into the Microstructural Response of a BEPM Metastable β-Phase Ti Alloy to Flexural Stresses

AU - Naseri, Ryan

AU - Mitchell, David R.G.

AU - Gazder, Azdiar A.

AU - Niessen, Frank

AU - Nancarrow, Mitchell

AU - Savvakin, Dmytro G.

AU - Pereloma, Elena

PY - 2024

Y1 - 2024

N2 - A Ti-10V-3Al-3Fe metastable β Ti alloy was strained under three-point bending conditions according to the ASTM E290-14 standard. A combination of electron backscatter diffraction (EBSD) mapping and high-resolution scanning transmission electron microscopy (STEM) was used to investigate the microstructural response to flexural stress. Results reveal a delayed formation of the deformation products, due to the load-bearing capacity of the constituent voids. The deformation products are confined in narrow bands on either side of the fracture surface. 332⟨113⟩ twinning system is identified as the primary deformation mode followed by the formation of α″ martensite both in β matrix and β twins. Accommodation of the microscopic strain arising from the development of α″ structure and β-twinning triggers the formation of fine deformation-induced ω plates, which are observed predominantly at the interfacial plane of β/βtwin and β/α″, and also in the interior of the β twins.

AB - A Ti-10V-3Al-3Fe metastable β Ti alloy was strained under three-point bending conditions according to the ASTM E290-14 standard. A combination of electron backscatter diffraction (EBSD) mapping and high-resolution scanning transmission electron microscopy (STEM) was used to investigate the microstructural response to flexural stress. Results reveal a delayed formation of the deformation products, due to the load-bearing capacity of the constituent voids. The deformation products are confined in narrow bands on either side of the fracture surface. 332⟨113⟩ twinning system is identified as the primary deformation mode followed by the formation of α″ martensite both in β matrix and β twins. Accommodation of the microscopic strain arising from the development of α″ structure and β-twinning triggers the formation of fine deformation-induced ω plates, which are observed predominantly at the interfacial plane of β/βtwin and β/α″, and also in the interior of the β twins.

KW - Ti alloy

KW - Deformation-induced phase transformation

KW - Transmission electron microscopy

KW - Electron back-scattering diffraction

KW - Twinning

KW - Martensitic transformation

U2 - 10.1002/adem.202300350

DO - 10.1002/adem.202300350

M3 - Journal article

SN - 1438-1656

VL - 26

JO - Advanced Engineering Materials

JF - Advanced Engineering Materials

IS - 4

M1 - 2300350

ER -

An Investigation into the Microstructural Response of a BEPM Metastable β-Phase Ti Alloy to Flexural Stresses

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