Cyclic creep and recovery behavior of Nextel™720/alumina ceramic composite at 1200°C
▶ Nextel™720/alumina ceramic composite exhibits significant creep strain recovery at 1200°C in air. ▶ Creep strain recovery reduces creep strain accumulation and improves creep lifetimes at 1200°C in air. ▶ Life predictions that do not account for strain recovery may notably underestimate service li...
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| Veröffentlicht in: | Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2011-01, Vol.528 (3), p.1848-1856 |
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| container_title | Materials science & engineering. A, Structural materials : properties, microstructure and processing |
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| creator | Ruggles-Wrenn, M.B. Whiting, B.A. |
| description | ▶ Nextel™720/alumina ceramic composite exhibits significant creep strain recovery at 1200°C in air. ▶ Creep strain recovery reduces creep strain accumulation and improves creep lifetimes at 1200°C in air. ▶ Life predictions that do not account for strain recovery may notably underestimate service life of the component. ▶ Composite exhibits minimal creep strain recovery at 1200°C in steam. ▶ Additional matrix sintering and consequently densification of the matrix and increased fiber/matrix bonding impede creep-strain recovery at 1200°C in steam.
The cyclic creep and recovery behavior of an oxide–oxide continuous fiber ceramic composite was investigated at 1200°C in laboratory air and in steam environments. The composite consists of a porous alumina matrix reinforced with laminated, woven mullite/alumina (Nextel™720) fibers, has no interface between the fiber and matrix, and relies on the porous matrix for flaw tolerance. The main objective of this study was to assess the influence of various sustained creep and cyclic creep loading histories on the creep lifetime, creep strain rate, accumulated creep strain as well as on the recovery of creep strain at near zero stress. Cyclic creep-recovery tests were performed for maximum stress levels of 100 and 125MPa with creep and recovery periods ranging from 3min to 1h. In laboratory air, lifetimes produced in cyclic creep and recovery tests significantly exceeded those obtained in sustained creep tests. Introduction of intermittent periods of unloading and recovery at near zero stress into the creep loading history resulted in an appreciable improvement in creep lifetime. Presence of steam considerably degraded the material performance. In steam, lifetimes produced in cyclic creep and recovery tests were close to those obtained in sustained creep tests. Composite microstructure, as well as damage and failure mechanisms were investigated. |
| doi_str_mv | 10.1016/j.msea.2010.10.011 |
| format | Article |
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The cyclic creep and recovery behavior of an oxide–oxide continuous fiber ceramic composite was investigated at 1200°C in laboratory air and in steam environments. The composite consists of a porous alumina matrix reinforced with laminated, woven mullite/alumina (Nextel™720) fibers, has no interface between the fiber and matrix, and relies on the porous matrix for flaw tolerance. The main objective of this study was to assess the influence of various sustained creep and cyclic creep loading histories on the creep lifetime, creep strain rate, accumulated creep strain as well as on the recovery of creep strain at near zero stress. Cyclic creep-recovery tests were performed for maximum stress levels of 100 and 125MPa with creep and recovery periods ranging from 3min to 1h. In laboratory air, lifetimes produced in cyclic creep and recovery tests significantly exceeded those obtained in sustained creep tests. Introduction of intermittent periods of unloading and recovery at near zero stress into the creep loading history resulted in an appreciable improvement in creep lifetime. Presence of steam considerably degraded the material performance. In steam, lifetimes produced in cyclic creep and recovery tests were close to those obtained in sustained creep tests. Composite microstructure, as well as damage and failure mechanisms were investigated.</description><identifier>ISSN: 0921-5093</identifier><identifier>EISSN: 1873-4936</identifier><identifier>DOI: 10.1016/j.msea.2010.10.011</identifier><language>eng</language><publisher>Kidlington: Elsevier B.V</publisher><subject>Aluminum oxide ; Ceramic–matrix composites (CMCs) ; Condensed matter: structure, mechanical and thermal properties ; Creep ; Creep (materials) ; Creep tests ; Exact sciences and technology ; Fatigue, brittleness, fracture, and cracks ; Fibre ; Fractography ; High-temperature properties ; Mechanical and acoustical properties of condensed matter ; Mechanical properties of solids ; Microstructure ; Oxides ; Physics ; Recovery ; Strain ; Stresses</subject><ispartof>Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2011-01, Vol.528 (3), p.1848-1856</ispartof><rights>2010</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c310t-f5f3a384027e26c3b9a98c0313ae65b03062f5e9ba7e5ac79848ed961aa7a56b3</citedby><cites>FETCH-LOGICAL-c310t-f5f3a384027e26c3b9a98c0313ae65b03062f5e9ba7e5ac79848ed961aa7a56b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.msea.2010.10.011$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3548,27923,27924,45994</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=23754319$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Ruggles-Wrenn, M.B.</creatorcontrib><creatorcontrib>Whiting, B.A.</creatorcontrib><title>Cyclic creep and recovery behavior of Nextel™720/alumina ceramic composite at 1200°C</title><title>Materials science & engineering. A, Structural materials : properties, microstructure and processing</title><description>▶ Nextel™720/alumina ceramic composite exhibits significant creep strain recovery at 1200°C in air. ▶ Creep strain recovery reduces creep strain accumulation and improves creep lifetimes at 1200°C in air. ▶ Life predictions that do not account for strain recovery may notably underestimate service life of the component. ▶ Composite exhibits minimal creep strain recovery at 1200°C in steam. ▶ Additional matrix sintering and consequently densification of the matrix and increased fiber/matrix bonding impede creep-strain recovery at 1200°C in steam.
The cyclic creep and recovery behavior of an oxide–oxide continuous fiber ceramic composite was investigated at 1200°C in laboratory air and in steam environments. The composite consists of a porous alumina matrix reinforced with laminated, woven mullite/alumina (Nextel™720) fibers, has no interface between the fiber and matrix, and relies on the porous matrix for flaw tolerance. The main objective of this study was to assess the influence of various sustained creep and cyclic creep loading histories on the creep lifetime, creep strain rate, accumulated creep strain as well as on the recovery of creep strain at near zero stress. Cyclic creep-recovery tests were performed for maximum stress levels of 100 and 125MPa with creep and recovery periods ranging from 3min to 1h. In laboratory air, lifetimes produced in cyclic creep and recovery tests significantly exceeded those obtained in sustained creep tests. Introduction of intermittent periods of unloading and recovery at near zero stress into the creep loading history resulted in an appreciable improvement in creep lifetime. Presence of steam considerably degraded the material performance. In steam, lifetimes produced in cyclic creep and recovery tests were close to those obtained in sustained creep tests. Composite microstructure, as well as damage and failure mechanisms were investigated.</description><subject>Aluminum oxide</subject><subject>Ceramic–matrix composites (CMCs)</subject><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Creep</subject><subject>Creep (materials)</subject><subject>Creep tests</subject><subject>Exact sciences and technology</subject><subject>Fatigue, brittleness, fracture, and cracks</subject><subject>Fibre</subject><subject>Fractography</subject><subject>High-temperature properties</subject><subject>Mechanical and acoustical properties of condensed matter</subject><subject>Mechanical properties of solids</subject><subject>Microstructure</subject><subject>Oxides</subject><subject>Physics</subject><subject>Recovery</subject><subject>Strain</subject><subject>Stresses</subject><issn>0921-5093</issn><issn>1873-4936</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNp9kEFq3DAUhkVoINMkF8hKm9BuPHmSLNmCbsrQtIXQblK6FM-aZ6LBtqaSZ-jse5KcoGfIUXqS2p3QZVYPfr7_f_AxdiVgKUCYm82yz4RLCf-CJQhxwhairlRRWmVesQVYKQoNVp2x1zlvAECUoBfs--rgu-C5T0RbjsOaJ_JxT-nAG3rAfYiJx5Z_oZ8jdX9-PVYSbrDb9WFA7ilhP3djv405jMRx5EICPP1eXbDTFrtMl8_3nH27_XC_-lTcff34efX-rvBKwFi0ulWo6hJkRdJ41Vi0tQclFJLRDSgwstVkG6xIo69sXda0tkYgVqhNo87Zm-PuNsUfO8qj60P21HU4UNxlV1sjSylrPZFvXySFsVKZSgNMqDyiPsWcE7Vum0KP6eAEuNm327jZt5t9z9nkeypdP-9j9ti1CQcf8v-mVJUulbAT9-7I0aRlHyi57AMNntZhUj-6dQwvvfkLDYKVyA</recordid><startdate>20110101</startdate><enddate>20110101</enddate><creator>Ruggles-Wrenn, M.B.</creator><creator>Whiting, B.A.</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7QQ</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20110101</creationdate><title>Cyclic creep and recovery behavior of Nextel™720/alumina ceramic composite at 1200°C</title><author>Ruggles-Wrenn, M.B. ; Whiting, B.A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c310t-f5f3a384027e26c3b9a98c0313ae65b03062f5e9ba7e5ac79848ed961aa7a56b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Aluminum oxide</topic><topic>Ceramic–matrix composites (CMCs)</topic><topic>Condensed matter: structure, mechanical and thermal properties</topic><topic>Creep</topic><topic>Creep (materials)</topic><topic>Creep tests</topic><topic>Exact sciences and technology</topic><topic>Fatigue, brittleness, fracture, and cracks</topic><topic>Fibre</topic><topic>Fractography</topic><topic>High-temperature properties</topic><topic>Mechanical and acoustical properties of condensed matter</topic><topic>Mechanical properties of solids</topic><topic>Microstructure</topic><topic>Oxides</topic><topic>Physics</topic><topic>Recovery</topic><topic>Strain</topic><topic>Stresses</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ruggles-Wrenn, M.B.</creatorcontrib><creatorcontrib>Whiting, B.A.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Materials science & engineering. A, Structural materials : properties, microstructure and processing</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ruggles-Wrenn, M.B.</au><au>Whiting, B.A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Cyclic creep and recovery behavior of Nextel™720/alumina ceramic composite at 1200°C</atitle><jtitle>Materials science & engineering. A, Structural materials : properties, microstructure and processing</jtitle><date>2011-01-01</date><risdate>2011</risdate><volume>528</volume><issue>3</issue><spage>1848</spage><epage>1856</epage><pages>1848-1856</pages><issn>0921-5093</issn><eissn>1873-4936</eissn><abstract>▶ Nextel™720/alumina ceramic composite exhibits significant creep strain recovery at 1200°C in air. ▶ Creep strain recovery reduces creep strain accumulation and improves creep lifetimes at 1200°C in air. ▶ Life predictions that do not account for strain recovery may notably underestimate service life of the component. ▶ Composite exhibits minimal creep strain recovery at 1200°C in steam. ▶ Additional matrix sintering and consequently densification of the matrix and increased fiber/matrix bonding impede creep-strain recovery at 1200°C in steam.
The cyclic creep and recovery behavior of an oxide–oxide continuous fiber ceramic composite was investigated at 1200°C in laboratory air and in steam environments. The composite consists of a porous alumina matrix reinforced with laminated, woven mullite/alumina (Nextel™720) fibers, has no interface between the fiber and matrix, and relies on the porous matrix for flaw tolerance. The main objective of this study was to assess the influence of various sustained creep and cyclic creep loading histories on the creep lifetime, creep strain rate, accumulated creep strain as well as on the recovery of creep strain at near zero stress. Cyclic creep-recovery tests were performed for maximum stress levels of 100 and 125MPa with creep and recovery periods ranging from 3min to 1h. In laboratory air, lifetimes produced in cyclic creep and recovery tests significantly exceeded those obtained in sustained creep tests. Introduction of intermittent periods of unloading and recovery at near zero stress into the creep loading history resulted in an appreciable improvement in creep lifetime. Presence of steam considerably degraded the material performance. In steam, lifetimes produced in cyclic creep and recovery tests were close to those obtained in sustained creep tests. Composite microstructure, as well as damage and failure mechanisms were investigated.</abstract><cop>Kidlington</cop><pub>Elsevier B.V</pub><doi>10.1016/j.msea.2010.10.011</doi><tpages>9</tpages></addata></record> |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Aluminum oxide Ceramic–matrix composites (CMCs) Condensed matter: structure, mechanical and thermal properties Creep Creep (materials) Creep tests Exact sciences and technology Fatigue, brittleness, fracture, and cracks Fibre Fractography High-temperature properties Mechanical and acoustical properties of condensed matter Mechanical properties of solids Microstructure Oxides Physics Recovery Strain Stresses |
| title | Cyclic creep and recovery behavior of Nextel™720/alumina ceramic composite at 1200°C |
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