Some observations on cyclic deformation structures in the high-strength commercial aluminum alloy AA 7150
Load-controlled fatigue testing of the aluminum alloy AA 7150 has been conducted using four-point bending with an R ratio of +0.1 over a range of maximum stress levels from 60 to 120 pct of the 0.2 pct proof stress. The alloy, in the form of 12.5-mm rolled plate, was investigated in underaged (UA),...
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| Veröffentlicht in: | Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Physical Metallurgy and Materials Science, 1998-11, Vol.29 (11), p.2727-2736 |
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| container_title | Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science |
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| creator | HANLON, D. N RAINFORTH, W. M |
| description | Load-controlled fatigue testing of the aluminum alloy AA 7150 has been conducted using four-point bending with an R ratio of +0.1 over a range of maximum stress levels from 60 to 120 pct of the 0.2 pct proof stress. The alloy, in the form of 12.5-mm rolled plate, was investigated in underaged (UA), peak-aged (PA), and overaged (OA) conditions, corresponding to a change in average precipitate sizes from 5 nm in the UA condition to 21 nm in the OA condition. Three orientations of the plate were investigated. Orientation and aging condition influenced the degree of surface topographical development but not fatigue life. Detailed transmission electron microscopy (TEM) of the fatigued surface indicated that deformation in all aging conditions occurred by planar slip. Slip was generally restricted to a single slip system within each grain, and subgrain boundaries offered little resistance to dislocation movement facilitating long slip line lengths (measured up to 310 mu m) between adjacent high-angle grain boundaries. Planar slip observed in the OA condition is attributed to shearing of large strengthening precipitates, which is promoted by long slip line lengths. No evidence of surface specific changes in slip character was observed. |
| doi_str_mv | 10.1007/s11661-998-0313-9 |
| format | Article |
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N ; RAINFORTH, W. M</creator><creatorcontrib>HANLON, D. N ; RAINFORTH, W. M</creatorcontrib><description>Load-controlled fatigue testing of the aluminum alloy AA 7150 has been conducted using four-point bending with an R ratio of +0.1 over a range of maximum stress levels from 60 to 120 pct of the 0.2 pct proof stress. The alloy, in the form of 12.5-mm rolled plate, was investigated in underaged (UA), peak-aged (PA), and overaged (OA) conditions, corresponding to a change in average precipitate sizes from 5 nm in the UA condition to 21 nm in the OA condition. Three orientations of the plate were investigated. Orientation and aging condition influenced the degree of surface topographical development but not fatigue life. Detailed transmission electron microscopy (TEM) of the fatigued surface indicated that deformation in all aging conditions occurred by planar slip. Slip was generally restricted to a single slip system within each grain, and subgrain boundaries offered little resistance to dislocation movement facilitating long slip line lengths (measured up to 310 mu m) between adjacent high-angle grain boundaries. Planar slip observed in the OA condition is attributed to shearing of large strengthening precipitates, which is promoted by long slip line lengths. No evidence of surface specific changes in slip character was observed.</description><identifier>ISSN: 1073-5623</identifier><identifier>EISSN: 1543-1940</identifier><identifier>DOI: 10.1007/s11661-998-0313-9</identifier><identifier>CODEN: MMTAEB</identifier><language>eng</language><publisher>New York, NY: Springer</publisher><subject>AGING ; Al Zn Mg Cu alloys ; ALUMINIUM BASE ALLOYS ; ALUMINUM ALLOYS ; Aluminum base alloys ; Applied sciences ; BEND TESTS ; CRACK INITIATION ; Cross-disciplinary physics: materials science; rheology ; Deformation mechanisms ; Deformation, plasticity, and creep ; DISLOCATIONS ; Exact sciences and technology ; FATIGUE ; Fatigue life ; FATIGUE TESTS ; GRAIN BOUNDARIES ; MATERIALS SCIENCE ; Mechanical properties ; Metals. 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N</creatorcontrib><creatorcontrib>RAINFORTH, W. M</creatorcontrib><title>Some observations on cyclic deformation structures in the high-strength commercial aluminum alloy AA 7150</title><title>Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science</title><description>Load-controlled fatigue testing of the aluminum alloy AA 7150 has been conducted using four-point bending with an R ratio of +0.1 over a range of maximum stress levels from 60 to 120 pct of the 0.2 pct proof stress. The alloy, in the form of 12.5-mm rolled plate, was investigated in underaged (UA), peak-aged (PA), and overaged (OA) conditions, corresponding to a change in average precipitate sizes from 5 nm in the UA condition to 21 nm in the OA condition. Three orientations of the plate were investigated. Orientation and aging condition influenced the degree of surface topographical development but not fatigue life. Detailed transmission electron microscopy (TEM) of the fatigued surface indicated that deformation in all aging conditions occurred by planar slip. Slip was generally restricted to a single slip system within each grain, and subgrain boundaries offered little resistance to dislocation movement facilitating long slip line lengths (measured up to 310 mu m) between adjacent high-angle grain boundaries. Planar slip observed in the OA condition is attributed to shearing of large strengthening precipitates, which is promoted by long slip line lengths. 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N ; RAINFORTH, W. M</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c356t-446c422ab77f3dcb851b08eb880dd5e53dc3a78b8d09f752109c23ceeefad6593</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>AGING</topic><topic>Al Zn Mg Cu alloys</topic><topic>ALUMINIUM BASE ALLOYS</topic><topic>ALUMINUM ALLOYS</topic><topic>Aluminum base alloys</topic><topic>Applied sciences</topic><topic>BEND TESTS</topic><topic>CRACK INITIATION</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Deformation mechanisms</topic><topic>Deformation, plasticity, and creep</topic><topic>DISLOCATIONS</topic><topic>Exact sciences and technology</topic><topic>FATIGUE</topic><topic>Fatigue life</topic><topic>FATIGUE TESTS</topic><topic>GRAIN BOUNDARIES</topic><topic>MATERIALS SCIENCE</topic><topic>Mechanical properties</topic><topic>Metals. 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A, Physical Metallurgy and Materials Science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>HANLON, D. N</au><au>RAINFORTH, W. M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Some observations on cyclic deformation structures in the high-strength commercial aluminum alloy AA 7150</atitle><jtitle>Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science</jtitle><date>1998-11-01</date><risdate>1998</risdate><volume>29</volume><issue>11</issue><spage>2727</spage><epage>2736</epage><pages>2727-2736</pages><issn>1073-5623</issn><eissn>1543-1940</eissn><coden>MMTAEB</coden><abstract>Load-controlled fatigue testing of the aluminum alloy AA 7150 has been conducted using four-point bending with an R ratio of +0.1 over a range of maximum stress levels from 60 to 120 pct of the 0.2 pct proof stress. The alloy, in the form of 12.5-mm rolled plate, was investigated in underaged (UA), peak-aged (PA), and overaged (OA) conditions, corresponding to a change in average precipitate sizes from 5 nm in the UA condition to 21 nm in the OA condition. Three orientations of the plate were investigated. Orientation and aging condition influenced the degree of surface topographical development but not fatigue life. Detailed transmission electron microscopy (TEM) of the fatigued surface indicated that deformation in all aging conditions occurred by planar slip. Slip was generally restricted to a single slip system within each grain, and subgrain boundaries offered little resistance to dislocation movement facilitating long slip line lengths (measured up to 310 mu m) between adjacent high-angle grain boundaries. Planar slip observed in the OA condition is attributed to shearing of large strengthening precipitates, which is promoted by long slip line lengths. No evidence of surface specific changes in slip character was observed.</abstract><cop>New York, NY</cop><pub>Springer</pub><doi>10.1007/s11661-998-0313-9</doi><tpages>10</tpages></addata></record> |
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| ispartof | Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, 1998-11, Vol.29 (11), p.2727-2736 |
| issn | 1073-5623 1543-1940 |
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| source | Springer Nature - Complete Springer Journals |
| subjects | AGING Al Zn Mg Cu alloys ALUMINIUM BASE ALLOYS ALUMINUM ALLOYS Aluminum base alloys Applied sciences BEND TESTS CRACK INITIATION Cross-disciplinary physics: materials science rheology Deformation mechanisms Deformation, plasticity, and creep DISLOCATIONS Exact sciences and technology FATIGUE Fatigue life FATIGUE TESTS GRAIN BOUNDARIES MATERIALS SCIENCE Mechanical properties Metals. Metallurgy MICROSTRUCTURE ORIENTATION Physics PRECIPITATION RECRYSTALLIZATION SLIP TRANSMISSION ELECTRON MICROSCOPY Treatment of materials and its effects on microstructure and properties |
| title | Some observations on cyclic deformation structures in the high-strength commercial aluminum alloy AA 7150 |
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