A study of fracture behaviour of gamma lamella using the notched TiAl micro-cantilever

Rengen Ding; Yu-Lung Chiu; Mingqiang Chu; Sanjooram Paddea; Guangqiao Su

doi:10.1080/14786435.2020.1714088

A study of fracture behaviour of gamma lamella using the notched TiAl micro-cantilever

Rengen Ding, Yu-Lung Chiu, Mingqiang Chu, Sanjooram Paddea, Guangqiao Su

Metallurgy and Materials

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

2 Citations (Scopus)

199 Downloads (Pure)

Abstract

Microcantilevers were machined from a single γ(TiAl)-α ₂(Ti ₃Al) lamellae colony of a polycrystalline commercial Ti-45Al-2Mn-2Nb sample using the focussed ion beam. The long axis of the microcantilevers is perpendicular to the lamellar interface with the notch prepared in the same γ lamella. Bending test results demonstrated good repeatability and the fracture stress intensity factor of individual γ lamella was measured to be 3.1 ± 0.2 MPa m ^1/2. (Formula presented.) twinning ahead of the notch (crack) tip plays a key role in the crack initiation. TEM analysis shows that the interaction of twinning with the lamellar interface leads to interfacial cracking and contributes to the work-hardening observed.

Original language	English
Pages (from-to)	982-997
Number of pages	16
Journal	Philosophical Magazine
Volume	100
Issue number	8
DOIs	https://doi.org/10.1080/14786435.2020.1714088
Publication status	Published - 16 Jan 2020

Keywords

Electron microscopy
FIB
Fracture
Microcantilever
γ-TiAl

ASJC Scopus subject areas

Condensed Matter Physics

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Ding_et_al_A_study_of_fracture_behaviour_of_gamma_lamella_Philosophical_Magazine_2020
This is an Accepted Manuscript of an article published by Taylor & Francis in Philosophical Magazine on 16/01/2020, available online: https://doi.org/10.1080/14786435.2020.1714088
Accepted author manuscript, 2.85 MBLicence: None: All rights reserved

https://doi.org/10.1080/14786435.2020.1714088Licence: None: All rights reserved

Cite this

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title = "A study of fracture behaviour of gamma lamella using the notched TiAl micro-cantilever",

abstract = "Microcantilevers were machined from a single γ(TiAl)-α 2(Ti 3Al) lamellae colony of a polycrystalline commercial Ti-45Al-2Mn-2Nb sample using the focussed ion beam. The long axis of the microcantilevers is perpendicular to the lamellar interface with the notch prepared in the same γ lamella. Bending test results demonstrated good repeatability and the fracture stress intensity factor of individual γ lamella was measured to be 3.1 ± 0.2 MPa m 1/2. (Formula presented.) twinning ahead of the notch (crack) tip plays a key role in the crack initiation. TEM analysis shows that the interaction of twinning with the lamellar interface leads to interfacial cracking and contributes to the work-hardening observed. ",

keywords = "Electron microscopy, FIB, Fracture, Microcantilever, γ-TiAl",

author = "Rengen Ding and Yu-Lung Chiu and Mingqiang Chu and Sanjooram Paddea and Guangqiao Su",

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doi = "10.1080/14786435.2020.1714088",

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T1 - A study of fracture behaviour of gamma lamella using the notched TiAl micro-cantilever

AU - Ding, Rengen

AU - Chiu, Yu-Lung

AU - Chu, Mingqiang

AU - Paddea, Sanjooram

AU - Su, Guangqiao

PY - 2020/1/16

Y1 - 2020/1/16

N2 - Microcantilevers were machined from a single γ(TiAl)-α 2(Ti 3Al) lamellae colony of a polycrystalline commercial Ti-45Al-2Mn-2Nb sample using the focussed ion beam. The long axis of the microcantilevers is perpendicular to the lamellar interface with the notch prepared in the same γ lamella. Bending test results demonstrated good repeatability and the fracture stress intensity factor of individual γ lamella was measured to be 3.1 ± 0.2 MPa m 1/2. (Formula presented.) twinning ahead of the notch (crack) tip plays a key role in the crack initiation. TEM analysis shows that the interaction of twinning with the lamellar interface leads to interfacial cracking and contributes to the work-hardening observed.

AB - Microcantilevers were machined from a single γ(TiAl)-α 2(Ti 3Al) lamellae colony of a polycrystalline commercial Ti-45Al-2Mn-2Nb sample using the focussed ion beam. The long axis of the microcantilevers is perpendicular to the lamellar interface with the notch prepared in the same γ lamella. Bending test results demonstrated good repeatability and the fracture stress intensity factor of individual γ lamella was measured to be 3.1 ± 0.2 MPa m 1/2. (Formula presented.) twinning ahead of the notch (crack) tip plays a key role in the crack initiation. TEM analysis shows that the interaction of twinning with the lamellar interface leads to interfacial cracking and contributes to the work-hardening observed.

KW - Electron microscopy

KW - FIB

KW - Fracture

KW - Microcantilever

KW - γ-TiAl

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DO - 10.1080/14786435.2020.1714088

M3 - Article

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VL - 100

SP - 982

EP - 997

JO - Philosophical Magazine

JF - Philosophical Magazine

IS - 8

ER -

A study of fracture behaviour of gamma lamella using the notched TiAl micro-cantilever

Abstract

Keywords

ASJC Scopus subject areas

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