Crack nucleation and growth in α/β titanium alloy with lamellar microstructure under uniaxial tension: 3D X-ray tomography analysis

Ning Dang; Lingyu Liu; Jérôme Adrien; Sophie Cazottes; Wenlong Xiao; Chaoli Ma; Lian Zhou; Eric Maire

doi:10.1016/j.msea.2019.01.065

Crack nucleation and growth in α/β titanium alloy with lamellar microstructure under uniaxial tension: 3D X-ray tomography analysis

Ning Dang, Lingyu Liu, Jérôme Adrien, Sophie Cazottes, Wenlong Xiao, Chaoli Ma, Lian Zhou, Eric Maire

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

23 Scopus citations

Abstract

In situ tensile tests were carried out on notch axisymmetric samples of as-cast (α+β) Ti alloy to analyze evolution of void/micro-crack with the help of X-ray Synchrotron tomography. The results indicate that junctions or boundaries of α colonies could be the most vulnerable sites for voids nucleation. In addition, during the growth and coalescence procedure, “ligaments” could be observed on the voids/micro-crack. A “bypassing & fracture” propagating approach was proposed and validated to interpret the existence of “ligaments”. In the propagating procedure, due to lacking of hard precipitations, microstructure zone and other inserting colony could play a role as hard obstacle in the growing path. This could induce a “bypassing & fracture” propagating approach for void coalescence and micro-crack growth.

Original language	English
Pages (from-to)	154-160
Number of pages	7
Journal	Materials Science and Engineering: A
Volume	747
DOIs	https://doi.org/10.1016/j.msea.2019.01.065
State	Published - 18 Feb 2019
Externally published	Yes

Keywords

Bypassing behavior
In situ tensile test
Ti-6Al-4V alloy
Void propagation
X-ray tomography

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10.1016/j.msea.2019.01.065

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title = "Crack nucleation and growth in α/β titanium alloy with lamellar microstructure under uniaxial tension: 3D X-ray tomography analysis",

abstract = "In situ tensile tests were carried out on notch axisymmetric samples of as-cast (α+β) Ti alloy to analyze evolution of void/micro-crack with the help of X-ray Synchrotron tomography. The results indicate that junctions or boundaries of α colonies could be the most vulnerable sites for voids nucleation. In addition, during the growth and coalescence procedure, “ligaments” could be observed on the voids/micro-crack. A “bypassing & fracture” propagating approach was proposed and validated to interpret the existence of “ligaments”. In the propagating procedure, due to lacking of hard precipitations, microstructure zone and other inserting colony could play a role as hard obstacle in the growing path. This could induce a “bypassing & fracture” propagating approach for void coalescence and micro-crack growth.",

keywords = "Bypassing behavior, In situ tensile test, Ti-6Al-4V alloy, Void propagation, X-ray tomography",

author = "Ning Dang and Lingyu Liu and J{\'e}r{\^o}me Adrien and Sophie Cazottes and Wenlong Xiao and Chaoli Ma and Lian Zhou and Eric Maire",

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year = "2019",

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doi = "10.1016/j.msea.2019.01.065",

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T1 - Crack nucleation and growth in α/β titanium alloy with lamellar microstructure under uniaxial tension

T2 - 3D X-ray tomography analysis

AU - Dang, Ning

AU - Liu, Lingyu

AU - Adrien, Jérôme

AU - Cazottes, Sophie

AU - Xiao, Wenlong

AU - Ma, Chaoli

AU - Zhou, Lian

AU - Maire, Eric

PY - 2019/2/18

Y1 - 2019/2/18

N2 - In situ tensile tests were carried out on notch axisymmetric samples of as-cast (α+β) Ti alloy to analyze evolution of void/micro-crack with the help of X-ray Synchrotron tomography. The results indicate that junctions or boundaries of α colonies could be the most vulnerable sites for voids nucleation. In addition, during the growth and coalescence procedure, “ligaments” could be observed on the voids/micro-crack. A “bypassing & fracture” propagating approach was proposed and validated to interpret the existence of “ligaments”. In the propagating procedure, due to lacking of hard precipitations, microstructure zone and other inserting colony could play a role as hard obstacle in the growing path. This could induce a “bypassing & fracture” propagating approach for void coalescence and micro-crack growth.

AB - In situ tensile tests were carried out on notch axisymmetric samples of as-cast (α+β) Ti alloy to analyze evolution of void/micro-crack with the help of X-ray Synchrotron tomography. The results indicate that junctions or boundaries of α colonies could be the most vulnerable sites for voids nucleation. In addition, during the growth and coalescence procedure, “ligaments” could be observed on the voids/micro-crack. A “bypassing & fracture” propagating approach was proposed and validated to interpret the existence of “ligaments”. In the propagating procedure, due to lacking of hard precipitations, microstructure zone and other inserting colony could play a role as hard obstacle in the growing path. This could induce a “bypassing & fracture” propagating approach for void coalescence and micro-crack growth.

KW - Bypassing behavior

KW - In situ tensile test

KW - Ti-6Al-4V alloy

KW - Void propagation

KW - X-ray tomography

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DO - 10.1016/j.msea.2019.01.065

M3 - 文章

AN - SCOPUS:85060335347

SN - 0921-5093

VL - 747

SP - 154

EP - 160

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Crack nucleation and growth in α/β titanium alloy with lamellar microstructure under uniaxial tension: 3D X-ray tomography analysis

Abstract

Keywords

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