Effect of strontium modification on near-threshold fatigue crack growth in an Al-Si-Cu die cast alloy
The effects of strontium modification on microstructure and fatigue properties in a die cast commercial aluminum-silicon alloy are demonstrated. Strontium additions of 0.010 and 0.018 wt.% drastically change the morphology of the eutectic silicon. The influence of these microstructural changes on fa...
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| Veröffentlicht in: | Metallurgical Transactions, A A, 1996-05, Vol.27 (5), p.1293-1302 |
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| container_title | Metallurgical Transactions, A |
| container_volume | 27 |
| creator | SCHAEFER, M FOURNELLE, R. A |
| description | The effects of strontium modification on microstructure and fatigue properties in a die cast commercial aluminum-silicon alloy are demonstrated. Strontium additions of 0.010 and 0.018 wt.% drastically change the morphology of the eutectic silicon. The influence of these microstructural changes on fatigue properties is evaluated through fatigue crack growth testing. Examination of the fracture surfaces and the crack path establish distinct fatigue fracture modes for the modified and unmodified eutectic structures. Changes in fracture mode and crack path are correlated to the microstructure changes. A higher energy fracture mode and increased crack path tortuosity explain the observed improvement in fatigue properties for the modified alloys. Strontium modified alloys exhibit a 10-20% higher fatigue crack growth threshold compared to an unmodified alloy for testing at a load ratio of 0.5. No difference was observed for testing at a load ratio of 0.1. |
| doi_str_mv | 10.1007/BF02649866 |
| format | Article |
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A</creator><creatorcontrib>SCHAEFER, M ; FOURNELLE, R. A</creatorcontrib><description>The effects of strontium modification on microstructure and fatigue properties in a die cast commercial aluminum-silicon alloy are demonstrated. Strontium additions of 0.010 and 0.018 wt.% drastically change the morphology of the eutectic silicon. The influence of these microstructural changes on fatigue properties is evaluated through fatigue crack growth testing. Examination of the fracture surfaces and the crack path establish distinct fatigue fracture modes for the modified and unmodified eutectic structures. Changes in fracture mode and crack path are correlated to the microstructure changes. A higher energy fracture mode and increased crack path tortuosity explain the observed improvement in fatigue properties for the modified alloys. Strontium modified alloys exhibit a 10-20% higher fatigue crack growth threshold compared to an unmodified alloy for testing at a load ratio of 0.5. No difference was observed for testing at a load ratio of 0.1.</description><identifier>ISSN: 1073-5623</identifier><identifier>EISSN: 1543-1940</identifier><identifier>DOI: 10.1007/BF02649866</identifier><identifier>CODEN: MMTAEB</identifier><language>eng</language><publisher>New York, NY: Springer</publisher><subject>ALUMINIUM BASE ALLOYS ; Applied sciences ; CASTING ; CHEMICAL COMPOSITION ; COPPER ALLOYS ; CRACK PROPAGATION ; Cross-disciplinary physics: materials science; rheology ; EUTECTICS ; Exact sciences and technology ; FATIGUE ; Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure ; Fatigue, embrittlement, and fracture ; FRACTURE PROPERTIES ; MATERIALS SCIENCE ; Metals. 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A</creatorcontrib><title>Effect of strontium modification on near-threshold fatigue crack growth in an Al-Si-Cu die cast alloy</title><title>Metallurgical Transactions, A</title><description>The effects of strontium modification on microstructure and fatigue properties in a die cast commercial aluminum-silicon alloy are demonstrated. Strontium additions of 0.010 and 0.018 wt.% drastically change the morphology of the eutectic silicon. The influence of these microstructural changes on fatigue properties is evaluated through fatigue crack growth testing. Examination of the fracture surfaces and the crack path establish distinct fatigue fracture modes for the modified and unmodified eutectic structures. Changes in fracture mode and crack path are correlated to the microstructure changes. A higher energy fracture mode and increased crack path tortuosity explain the observed improvement in fatigue properties for the modified alloys. Strontium modified alloys exhibit a 10-20% higher fatigue crack growth threshold compared to an unmodified alloy for testing at a load ratio of 0.5. No difference was observed for testing at a load ratio of 0.1.</description><subject>ALUMINIUM BASE ALLOYS</subject><subject>Applied sciences</subject><subject>CASTING</subject><subject>CHEMICAL COMPOSITION</subject><subject>COPPER ALLOYS</subject><subject>CRACK PROPAGATION</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>EUTECTICS</subject><subject>Exact sciences and technology</subject><subject>FATIGUE</subject><subject>Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure</subject><subject>Fatigue, embrittlement, and fracture</subject><subject>FRACTURE PROPERTIES</subject><subject>MATERIALS SCIENCE</subject><subject>Metals. Metallurgy</subject><subject>MICROSTRUCTURE</subject><subject>MORPHOLOGY</subject><subject>OPTICAL MICROSCOPY</subject><subject>Physics</subject><subject>SAMPLE PREPARATION</subject><subject>SILICON ALLOYS</subject><subject>STRONTIUM ADDITIONS</subject><subject>Treatment of materials and its effects on microstructure and properties</subject><issn>1073-5623</issn><issn>1543-1940</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNpFkE9LxDAQxYsoqKsXP0EE8SBU86dNm6MuuyoIHtRzGdOJjXaTNUmR_fZGVhQGZuD95sF7RXHC6CWjtLm6WVIuK9VKuVMcsLoSJVMV3c03bURZSy72i8MY3ymlTAl5UODCGNSJeENiCt4lO63IyvfWWA3JekfyOIRQpiFgHPzYE5OFtwmJDqA_yFvwX2kg1hFw5Hosn2w5n0hvsw4xERhHvzkq9gyMEY9_96x4WS6e53flw-Pt_fz6odSC1ansKSjVQo-9wgY0Kv6q2171vAHZVi1IzSQCzfFY24ABg6AFzTkURc4FF7PidOvrY7Jd1DahHrR3LkfsuKSiajJzvmXWwX9OGFO3slHjOIJDP8WMsVrWssrgxRbUwccY0HTrYFcQNh2j3U_b3X_bGT77dYWoYTQBnLbx70PQlomGi2_WMn5p</recordid><startdate>19960501</startdate><enddate>19960501</enddate><creator>SCHAEFER, M</creator><creator>FOURNELLE, R. A</creator><general>Springer</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>OTOTI</scope></search><sort><creationdate>19960501</creationdate><title>Effect of strontium modification on near-threshold fatigue crack growth in an Al-Si-Cu die cast alloy</title><author>SCHAEFER, M ; FOURNELLE, R. A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c315t-d0a998aded9e7ace92bc8d9d27a6848a6c16ea0986187afafeac3093690e22323</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1996</creationdate><topic>ALUMINIUM BASE ALLOYS</topic><topic>Applied sciences</topic><topic>CASTING</topic><topic>CHEMICAL COMPOSITION</topic><topic>COPPER ALLOYS</topic><topic>CRACK PROPAGATION</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>EUTECTICS</topic><topic>Exact sciences and technology</topic><topic>FATIGUE</topic><topic>Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure</topic><topic>Fatigue, embrittlement, and fracture</topic><topic>FRACTURE PROPERTIES</topic><topic>MATERIALS SCIENCE</topic><topic>Metals. Metallurgy</topic><topic>MICROSTRUCTURE</topic><topic>MORPHOLOGY</topic><topic>OPTICAL MICROSCOPY</topic><topic>Physics</topic><topic>SAMPLE PREPARATION</topic><topic>SILICON ALLOYS</topic><topic>STRONTIUM ADDITIONS</topic><topic>Treatment of materials and its effects on microstructure and properties</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>SCHAEFER, M</creatorcontrib><creatorcontrib>FOURNELLE, R. A</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>OSTI.GOV</collection><jtitle>Metallurgical Transactions, A</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>SCHAEFER, M</au><au>FOURNELLE, R. A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of strontium modification on near-threshold fatigue crack growth in an Al-Si-Cu die cast alloy</atitle><jtitle>Metallurgical Transactions, A</jtitle><date>1996-05-01</date><risdate>1996</risdate><volume>27</volume><issue>5</issue><spage>1293</spage><epage>1302</epage><pages>1293-1302</pages><issn>1073-5623</issn><eissn>1543-1940</eissn><coden>MMTAEB</coden><abstract>The effects of strontium modification on microstructure and fatigue properties in a die cast commercial aluminum-silicon alloy are demonstrated. Strontium additions of 0.010 and 0.018 wt.% drastically change the morphology of the eutectic silicon. The influence of these microstructural changes on fatigue properties is evaluated through fatigue crack growth testing. Examination of the fracture surfaces and the crack path establish distinct fatigue fracture modes for the modified and unmodified eutectic structures. Changes in fracture mode and crack path are correlated to the microstructure changes. A higher energy fracture mode and increased crack path tortuosity explain the observed improvement in fatigue properties for the modified alloys. Strontium modified alloys exhibit a 10-20% higher fatigue crack growth threshold compared to an unmodified alloy for testing at a load ratio of 0.5. No difference was observed for testing at a load ratio of 0.1.</abstract><cop>New York, NY</cop><pub>Springer</pub><doi>10.1007/BF02649866</doi><tpages>10</tpages></addata></record> |
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| issn | 1073-5623 1543-1940 |
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| source | SpringerLink Journals - AutoHoldings |
| subjects | ALUMINIUM BASE ALLOYS Applied sciences CASTING CHEMICAL COMPOSITION COPPER ALLOYS CRACK PROPAGATION Cross-disciplinary physics: materials science rheology EUTECTICS Exact sciences and technology FATIGUE Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure Fatigue, embrittlement, and fracture FRACTURE PROPERTIES MATERIALS SCIENCE Metals. Metallurgy MICROSTRUCTURE MORPHOLOGY OPTICAL MICROSCOPY Physics SAMPLE PREPARATION SILICON ALLOYS STRONTIUM ADDITIONS Treatment of materials and its effects on microstructure and properties |
| title | Effect of strontium modification on near-threshold fatigue crack growth in an Al-Si-Cu die cast alloy |
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