An experimental methodology to quantify the resistance of grain boundaries to fatigue crack growth in an AA2024 T351 Al-Cu Alloy

Wei Wen; Pei Cai; Alfonso H.W. Ngan; Tongguang Zhai

doi:10.1016/j.msea.2016.04.071

An experimental methodology to quantify the resistance of grain boundaries to fatigue crack growth in an AA2024 T351 Al-Cu Alloy

Wei Wen
, Pei Cai
, Alfonso H.W. Ngan
, Tongguang Zhai

Chemical and Materials Engineering

Producción científica: Article › revisión exhaustiva

30 Citas (Scopus)

Resumen

The growth behaviors of the short fatigue cracks initiated from the micro-notches, 30×15 μm², fabricated using FIB in some coarse grains, were investigated across grain boundaries in an AA2024-T351 Al-Cu-Mg alloy in four-point bend fatigue at 20 Hz, R=0.1, and room temperature in air. The resistance to short crack growth at the grain boundary that the crack crossed was quantified from the measured decrease in growth rate at the boundary. It was found that the decrease in crack growth rate followed a linear relationship with the twist component (α) of crack deflection at the boundary, as revealed in EBSD and FIB experiments. The resistance of grain boundaries to short crack growth was revealed to a Weilbul-type function of α, which quantitatively verified Zhai's minimum α criteria for short fatigue crack growth across grain boundaries in planar slip alloys.

Idioma original	English
Páginas (desde-hasta)	288-296
Número de páginas	9
Publicación	Materials Science and Engineering: A
Volumen	666
DOI	https://doi.org/10.1016/j.msea.2016.04.071
Estado	Published - jun 1 2016

Nota bibliográfica

Publisher Copyright:
© 2016 Elsevier B.V.

Financiación

This work was sponsored by NSF-DMR through a grant DMR-1207115 . The University of Hong Kong for kind supports for Dr. Wei Wen and Pei Cai to conduct FIB experiments at University of Hong Kong. The authors would also like to appreciate Dr. Parish Chad at Oak Ridge National Laboratory for help with FIB work through a SHaRE program and a CNMS program (NP-09–0065).

Financiadores	Número del financiador
NSF-DMR	DMR-1207115

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "An experimental methodology to quantify the resistance of grain boundaries to fatigue crack growth in an AA2024 T351 Al-Cu Alloy",

abstract = "The growth behaviors of the short fatigue cracks initiated from the micro-notches, 30{\texttimes}15 μm2, fabricated using FIB in some coarse grains, were investigated across grain boundaries in an AA2024-T351 Al-Cu-Mg alloy in four-point bend fatigue at 20 Hz, R=0.1, and room temperature in air. The resistance to short crack growth at the grain boundary that the crack crossed was quantified from the measured decrease in growth rate at the boundary. It was found that the decrease in crack growth rate followed a linear relationship with the twist component (α) of crack deflection at the boundary, as revealed in EBSD and FIB experiments. The resistance of grain boundaries to short crack growth was revealed to a Weilbul-type function of α, which quantitatively verified Zhai's minimum α criteria for short fatigue crack growth across grain boundaries in planar slip alloys.",

keywords = "EBSD, Fatigue crack, Focused ion beam, Grain boundary resistance, Growth rate",

author = "Wei Wen and Pei Cai and Ngan, \{Alfonso H.W.\} and Tongguang Zhai",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2016",

month = jun,

day = "1",

doi = "10.1016/j.msea.2016.04.071",

language = "English",

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pages = "288--296",

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T1 - An experimental methodology to quantify the resistance of grain boundaries to fatigue crack growth in an AA2024 T351 Al-Cu Alloy

AU - Wen, Wei

AU - Cai, Pei

AU - Ngan, Alfonso H.W.

AU - Zhai, Tongguang

PY - 2016/6/1

Y1 - 2016/6/1

N2 - The growth behaviors of the short fatigue cracks initiated from the micro-notches, 30×15 μm2, fabricated using FIB in some coarse grains, were investigated across grain boundaries in an AA2024-T351 Al-Cu-Mg alloy in four-point bend fatigue at 20 Hz, R=0.1, and room temperature in air. The resistance to short crack growth at the grain boundary that the crack crossed was quantified from the measured decrease in growth rate at the boundary. It was found that the decrease in crack growth rate followed a linear relationship with the twist component (α) of crack deflection at the boundary, as revealed in EBSD and FIB experiments. The resistance of grain boundaries to short crack growth was revealed to a Weilbul-type function of α, which quantitatively verified Zhai's minimum α criteria for short fatigue crack growth across grain boundaries in planar slip alloys.

AB - The growth behaviors of the short fatigue cracks initiated from the micro-notches, 30×15 μm2, fabricated using FIB in some coarse grains, were investigated across grain boundaries in an AA2024-T351 Al-Cu-Mg alloy in four-point bend fatigue at 20 Hz, R=0.1, and room temperature in air. The resistance to short crack growth at the grain boundary that the crack crossed was quantified from the measured decrease in growth rate at the boundary. It was found that the decrease in crack growth rate followed a linear relationship with the twist component (α) of crack deflection at the boundary, as revealed in EBSD and FIB experiments. The resistance of grain boundaries to short crack growth was revealed to a Weilbul-type function of α, which quantitatively verified Zhai's minimum α criteria for short fatigue crack growth across grain boundaries in planar slip alloys.

KW - EBSD

KW - Fatigue crack

KW - Focused ion beam

KW - Grain boundary resistance

KW - Growth rate

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DO - 10.1016/j.msea.2016.04.071

M3 - Article

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SN - 0921-5093

VL - 666

SP - 288

EP - 296

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

An experimental methodology to quantify the resistance of grain boundaries to fatigue crack growth in an AA2024 T351 Al-Cu Alloy

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ASJC Scopus subject areas

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