Influence of dynamic-strain aging due to excess Mg on fatigue crack growth rate scatter in Al6061-T6 alloy

•Influence of excess Mg on FCGR scatter using 6061-T6-based with added Zr or excess Mg.•A new approach to evaluate the scatter of FCGR using a limited number of test specimens.•Excess Mg promoted small scatter in Mode I fatigue crack growth.•Local plastic deformation affected the FCGR scatter of mic...

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Published inTheoretical and applied fracture mechanics Vol. 108; p. 102617
Main Authors Anis, Samsol Faizal, Koyama, Motomichi, Hamada, Shigeru, Noguchi, Hiroshi
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Ltd 01.08.2020
Elsevier BV
Subjects
Aging
Aging (artificial)
Aluminum alloys
Aluminum base alloys
Bending fatigue
Crack propagation
Dislocation pinning
Dynamic strain aging
Fatigue crack growth rate
Fatigue cracks
Fatigue failure
Fatigue tests
Fracture mechanics
Fracture surfaces
Metal fatigue
Plastic deformation
Precipitation hardening
Rotating bending fatigue test
Scatter
Scattering
Slip planes
Smooth specimen
Striations
Surface cracks
Zirconium
Aluminum alloys
Scatter
Fatigue crack growth rate
Rotating bending fatigue test
Smooth specimen
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Abstract •Influence of excess Mg on FCGR scatter using 6061-T6-based with added Zr or excess Mg.•A new approach to evaluate the scatter of FCGR using a limited number of test specimens.•Excess Mg promoted small scatter in Mode I fatigue crack growth.•Local plastic deformation affected the FCGR scatter of microstructurally-large fatigue cracks.•Dynamic strain aging of Mg induced stable Mode I crack growth. Fatigue failure results in high industrial costs, and its mechanism requires close examination; however, current methods are costly and time-consuming due to the need for a large number of test specimens. The purposes of this study are to investigate the influence of dynamic strain aging on fatigue crack growth rate (FCGR) scatter in Al 6061-T6 alloys and to present a new approach to evaluate the scatter of FCGR using a limited number of the test specimen. Rotating bending fatigue tests of 6061-T6-based Al alloys with added Zr and excess Mg were performed under constant amplitude loading using smooth specimens. The scatter behavior of FCGR is investigated by examining the fatigue crack growth on the specimen surface and fractographic observation on the fracture surface. The accounting for the interaction effects of multiple surface cracks and fractographic examination on striation formation from previous findings revealed that excess Mg promoted small scatter in Mode I fatigue crack growth. This study showed that local plastic deformation affected the FCGR scatter of microstructurally-large fatigue cracks. These findings suggest that dynamic strain aging of Mg induces stable Mode I crack growth due to pinning of dislocation movement on slip planes during the crack growth process.
AbstractList •Influence of excess Mg on FCGR scatter using 6061-T6-based with added Zr or excess Mg.•A new approach to evaluate the scatter of FCGR using a limited number of test specimens.•Excess Mg promoted small scatter in Mode I fatigue crack growth.•Local plastic deformation affected the FCGR scatter of microstructurally-large fatigue cracks.•Dynamic strain aging of Mg induced stable Mode I crack growth. Fatigue failure results in high industrial costs, and its mechanism requires close examination; however, current methods are costly and time-consuming due to the need for a large number of test specimens. The purposes of this study are to investigate the influence of dynamic strain aging on fatigue crack growth rate (FCGR) scatter in Al 6061-T6 alloys and to present a new approach to evaluate the scatter of FCGR using a limited number of the test specimen. Rotating bending fatigue tests of 6061-T6-based Al alloys with added Zr and excess Mg were performed under constant amplitude loading using smooth specimens. The scatter behavior of FCGR is investigated by examining the fatigue crack growth on the specimen surface and fractographic observation on the fracture surface. The accounting for the interaction effects of multiple surface cracks and fractographic examination on striation formation from previous findings revealed that excess Mg promoted small scatter in Mode I fatigue crack growth. This study showed that local plastic deformation affected the FCGR scatter of microstructurally-large fatigue cracks. These findings suggest that dynamic strain aging of Mg induces stable Mode I crack growth due to pinning of dislocation movement on slip planes during the crack growth process.
Fatigue failure results in high industrial costs, and its mechanism requires close examination; however, current methods are costly and time-consuming due to the need for a large number of test specimens. The purposes of this study are to investigate the influence of dynamic strain aging on fatigue crack growth rate (FCGR) scatter in Al 6061-T6 alloys and to present a new approach to evaluate the scatter of FCGR using a limited number of the test specimen. Rotating bending fatigue tests of 6061-T6-based Al alloys with added Zr and excess Mg were performed under constant amplitude loading using smooth specimens. The scatter behavior of FCGR is investigated by examining the fatigue crack growth on the specimen surface and fractographic observation on the fracture surface. The accounting for the interaction effects of multiple surface cracks and fractographic examination on striation formation from previous findings revealed that excess Mg promoted small scatter in Mode I fatigue crack growth. This study showed that local plastic deformation affected the FCGR scatter of microstructurally-large fatigue cracks. These findings suggest that dynamic strain aging of Mg induces stable Mode I crack growth due to pinning of dislocation movement on slip planes during the crack growth process.
ArticleNumber 102617
Author Anis, Samsol Faizal
Koyama, Motomichi
Noguchi, Hiroshi
Hamada, Shigeru
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  givenname: Hiroshi
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crossref_primary_10_2320_materia_62_24
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Keywords Aluminum alloys
Scatter
Fatigue crack growth rate
Rotating bending fatigue test
Smooth specimen
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Snippet •Influence of excess Mg on FCGR scatter using 6061-T6-based with added Zr or excess Mg.•A new approach to evaluate the scatter of FCGR using a limited number...
Fatigue failure results in high industrial costs, and its mechanism requires close examination; however, current methods are costly and time-consuming due to...
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StartPage 102617
SubjectTerms Aging
Aging (artificial)
Aluminum alloys
Aluminum base alloys
Bending fatigue
Crack propagation
Dislocation pinning
Dynamic strain aging
Fatigue crack growth rate
Fatigue cracks
Fatigue failure
Fatigue tests
Fracture mechanics
Fracture surfaces
Metal fatigue
Plastic deformation
Precipitation hardening
Rotating bending fatigue test
Scatter
Scattering
Slip planes
Smooth specimen
Striations
Surface cracks
Zirconium
Title Influence of dynamic-strain aging due to excess Mg on fatigue crack growth rate scatter in Al6061-T6 alloy
URI https://dx.doi.org/10.1016/j.tafmec.2020.102617
https://www.proquest.com/docview/2446295564
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