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Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloys

Anthony G. Spangenberger, Diana A. Lados, Mark Coleman Orcid Logo, Soran Birosca Orcid Logo, Mark C. Hardy

International Journal of Fatigue, Volume: 97, Pages: 202 - 213

Swansea University Authors: Mark Coleman Orcid Logo, Soran Birosca Orcid Logo

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Abstract

Fatigue crack growth-based design is a significant modern engineering consideration for the transportation sector, and its implementation requires accurate characterization and understanding of crack propagation mechanisms with respect to microstructure. To support this goal, long and small fatigue...

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Published in: International Journal of Fatigue
ISSN: 0142-1123
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa31564
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spelling 2021-01-14T13:07:51.8842435 v2 31564 2017-01-04 Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloys 73c5735de19c8a70acb41ab788081b67 0000-0002-4628-1077 Mark Coleman Mark Coleman true false 3445603fcc2ff9d27b476a73b223a507 0000-0002-8380-771X Soran Birosca Soran Birosca true false 2017-01-04 MTLS Fatigue crack growth-based design is a significant modern engineering consideration for the transportation sector, and its implementation requires accurate characterization and understanding of crack propagation mechanisms with respect to microstructure. To support this goal, long and small fatigue crack growth studies were conducted on widely used A356-T6 cast aluminum alloys in various microstructural conditions. Microstructural variations were created through processing and chemistry means in order to systematically investigate the individual and combined effects of the materials’ characteristic microstructural features on fatigue crack growth at all growth stages. Crack growth mechanisms and failure mode transitions are identified with respect to the eutectic Si morphology/distribution and grain structure by fractographic techniques and electron backscatter diffraction. Crack-microstructure interactions were investigated in depth across all crack sizes, and the respective roles of microstructural features were identified experimentally and further corroborated by numerical models. It is concluded that the eutectic Si phase enhances the alloys’ fatigue crack growth resistance in early growth stages (by transferring stresses off of the α-Al matrix), and progressively decreases due to damage localization. In later growth stages, the eutectic Si phase becomes increasingly detrimental to fatigue crack growth resistance because of its inherently low debonding strength and brittle fracture, as evidenced by the crack selectively following eutectic Si colonies. Journal Article International Journal of Fatigue 97 202 213 0142-1123 Small and long fatigue crack growth; Microstructural mechanisms; Electron backscatter diffraction; Stress concentrations; Aluminum alloys 1 4 2017 2017-04-01 10.1016/j.ijfatigue.2016.12.029 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2021-01-14T13:07:51.8842435 2017-01-04T12:21:48.0181967 College of Engineering Engineering Anthony G. Spangenberger 1 Diana A. Lados 2 Mark Coleman 0000-0002-4628-1077 3 Soran Birosca 0000-0002-8380-771X 4 Mark C. Hardy 5 0031564-04012017122239.pdf spangenberger2016.pdf 2017-01-04T12:22:39.0170000 Output 2962251 application/pdf Accepted Manuscript true 2017-12-24T00:00:00.0000000 Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND). true eng
title Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloys
spellingShingle Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloys
Mark Coleman
Soran Birosca
title_short Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloys
title_full Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloys
title_fullStr Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloys
title_full_unstemmed Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloys
title_sort Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloys
author_id_str_mv 73c5735de19c8a70acb41ab788081b67
3445603fcc2ff9d27b476a73b223a507
author_id_fullname_str_mv 73c5735de19c8a70acb41ab788081b67_***_Mark Coleman
3445603fcc2ff9d27b476a73b223a507_***_Soran Birosca
author Mark Coleman
Soran Birosca
author2 Anthony G. Spangenberger
Diana A. Lados
Mark Coleman
Soran Birosca
Mark C. Hardy
format Journal article
container_title International Journal of Fatigue
container_volume 97
container_start_page 202
publishDate 2017
institution Swansea University
issn 0142-1123
doi_str_mv 10.1016/j.ijfatigue.2016.12.029
college_str College of Engineering
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hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
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description Fatigue crack growth-based design is a significant modern engineering consideration for the transportation sector, and its implementation requires accurate characterization and understanding of crack propagation mechanisms with respect to microstructure. To support this goal, long and small fatigue crack growth studies were conducted on widely used A356-T6 cast aluminum alloys in various microstructural conditions. Microstructural variations were created through processing and chemistry means in order to systematically investigate the individual and combined effects of the materials’ characteristic microstructural features on fatigue crack growth at all growth stages. Crack growth mechanisms and failure mode transitions are identified with respect to the eutectic Si morphology/distribution and grain structure by fractographic techniques and electron backscatter diffraction. Crack-microstructure interactions were investigated in depth across all crack sizes, and the respective roles of microstructural features were identified experimentally and further corroborated by numerical models. It is concluded that the eutectic Si phase enhances the alloys’ fatigue crack growth resistance in early growth stages (by transferring stresses off of the α-Al matrix), and progressively decreases due to damage localization. In later growth stages, the eutectic Si phase becomes increasingly detrimental to fatigue crack growth resistance because of its inherently low debonding strength and brittle fracture, as evidenced by the crack selectively following eutectic Si colonies.
published_date 2017-04-01T03:43:25Z
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