Lamellar orientation effect on fatigue crack propagation threshold in coarse grained Ti46Al8Nb

Jing Yang; Hangyue Li; David Hu; Nigel Martin; Mark Dixon

doi:10.1179/1743284714Y.0000000510

Lamellar orientation effect on fatigue crack propagation threshold in coarse grained Ti46Al8Nb

Jing Yang, Hangyue Li, David Hu, Nigel Martin, Mark Dixon

Metallurgy and Materials

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

4 Citations (Scopus)

Abstract

Cast Ti46Al8Nb with coarse lamellar microstructures was subject to fatigue crack propagation test at 650°C with R=0.1. The notch region of each testpiece contains one or one dominant lamellar colony. A strong dependence of fatigue crack propagation threshold on lamellar orientation was found and the lamellar colonies with their interfaces parallel to the stress axis have the highest threshold and those 40–65u off the stress axis have the lowest threshold. It is elucidated that slip or twinning parallel to lamellar interface may interact with cross-lamella slip or twinning to help open up microcracks in front of the main crack.

Original language	English
Pages (from-to)	1905
Number of pages	6
Journal	Materials Science and Technology
Volume	30
Issue number	15
Early online date	10 Jan 2014
DOIs	https://doi.org/10.1179/1743284714Y.0000000510
Publication status	Published - Dec 2014

Keywords

Titanium aluminide,
TiAl,
Fatigue crack propagation threshold,
Lamellar microstructure,
Orientation

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10.1179/1743284714Y.0000000510

http://www.maneyonline.com/doi/abs/10.1179/1743284714Y.0000000510

Structural Metallic Systems For Advanced Gas Turbine Applications
Bowen, P., Chiu, Y. & Reed, R.
Engineering & Physical Science Research Council
1/10/09 → 30/09/14
Project: Research Councils

Cite this

@article{afed204a22e44025b0dd47f354acb816,

title = "Lamellar orientation effect on fatigue crack propagation threshold in coarse grained Ti46Al8Nb",

abstract = "Cast Ti46Al8Nb with coarse lamellar microstructures was subject to fatigue crack propagation test at 650°C with R=0.1. The notch region of each testpiece contains one or one dominant lamellar colony. A strong dependence of fatigue crack propagation threshold on lamellar orientation was found and the lamellar colonies with their interfaces parallel to the stress axis have the highest threshold and those 40–65u off the stress axis have the lowest threshold. It is elucidated that slip or twinning parallel to lamellar interface may interact with cross-lamella slip or twinning to help open up microcracks in front of the main crack.",

keywords = "Titanium aluminide,, TiAl, , Fatigue crack propagation threshold,, Lamellar microstructure, , Orientation",

author = "Jing Yang and Hangyue Li and David Hu and Nigel Martin and Mark Dixon",

year = "2014",

month = dec,

doi = "10.1179/1743284714Y.0000000510",

language = "English",

volume = "30",

pages = "1905",

journal = "Materials Science and Technology",

issn = "0267-0836",

publisher = "Maney Publishing",

number = "15",

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TY - JOUR

T1 - Lamellar orientation effect on fatigue crack propagation threshold in coarse grained Ti46Al8Nb

AU - Yang, Jing

AU - Li, Hangyue

AU - Hu, David

AU - Martin, Nigel

AU - Dixon, Mark

PY - 2014/12

Y1 - 2014/12

N2 - Cast Ti46Al8Nb with coarse lamellar microstructures was subject to fatigue crack propagation test at 650°C with R=0.1. The notch region of each testpiece contains one or one dominant lamellar colony. A strong dependence of fatigue crack propagation threshold on lamellar orientation was found and the lamellar colonies with their interfaces parallel to the stress axis have the highest threshold and those 40–65u off the stress axis have the lowest threshold. It is elucidated that slip or twinning parallel to lamellar interface may interact with cross-lamella slip or twinning to help open up microcracks in front of the main crack.

AB - Cast Ti46Al8Nb with coarse lamellar microstructures was subject to fatigue crack propagation test at 650°C with R=0.1. The notch region of each testpiece contains one or one dominant lamellar colony. A strong dependence of fatigue crack propagation threshold on lamellar orientation was found and the lamellar colonies with their interfaces parallel to the stress axis have the highest threshold and those 40–65u off the stress axis have the lowest threshold. It is elucidated that slip or twinning parallel to lamellar interface may interact with cross-lamella slip or twinning to help open up microcracks in front of the main crack.

KW - Titanium aluminide,

KW - TiAl,

KW - Fatigue crack propagation threshold,

KW - Lamellar microstructure,

KW - Orientation

U2 - 10.1179/1743284714Y.0000000510

DO - 10.1179/1743284714Y.0000000510

M3 - Article

SN - 0267-0836

VL - 30

SP - 1905

JO - Materials Science and Technology

JF - Materials Science and Technology

IS - 15

ER -

Lamellar orientation effect on fatigue crack propagation threshold in coarse grained Ti46Al8Nb

Abstract

Keywords

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Structural Metallic Systems For Advanced Gas Turbine Applications

Cite this