Solution softening in spinel
The critical resolved shear stress of MgO.nAl sub 2 O sub 3 spinel at a given temperature decreases dramatically, by almost two orders of magnitude, with increasing deviation from stoichiometry, i.e., as n increases from 1-3.5. The CRSS is proportional to exp(-T/T sub 0 ) and to [V sub c ] exp -2 ,...
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Veröffentlicht in: | Scripta Materialia 1998-08, Vol.39 (4), p.537-544 |
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description | The critical resolved shear stress of MgO.nAl sub 2 O sub 3 spinel at a given temperature decreases dramatically, by almost two orders of magnitude, with increasing deviation from stoichiometry, i.e., as n increases from 1-3.5. The CRSS is proportional to exp(-T/T sub 0 ) and to [V sub c ] exp -2 , where T sub 0 is a characteristic temperature and [V sub c ] is the concentration of charge-compensating cation vacancies. Slip on {111} planes is thought to occur between the Kagome cation layers and the adjacent anion layers. Slip on {101} planes is slightly easier (and has a higher T sub 0 ) because the planes are more widely separated. Slip in spinel does not require synchro-shear, unlike slip in the C15 AB sub 2 Laves phase, which has identical metal atom positions to the cation positions in spinel. The temperature dependence of the CRSS is analyzed in terms of a model based on partial dislocations overcoming a steep and high Peierls potential. Parameters for the model can be chosen to explain the observed values of T sub 0 and the CRSS extrapolated to T=0K for both spinel and sapphire. Other models are possible. The dependence of CRSS on [V sub c ] exp -2 can be explained in terms of kink nucleation at cation vacancies. |
doi_str_mv | 10.1016/S1359-6462(98)00194-8 |
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The CRSS is proportional to exp(-T/T sub 0 ) and to [V sub c ] exp -2 , where T sub 0 is a characteristic temperature and [V sub c ] is the concentration of charge-compensating cation vacancies. Slip on {111} planes is thought to occur between the Kagome cation layers and the adjacent anion layers. Slip on {101} planes is slightly easier (and has a higher T sub 0 ) because the planes are more widely separated. Slip in spinel does not require synchro-shear, unlike slip in the C15 AB sub 2 Laves phase, which has identical metal atom positions to the cation positions in spinel. The temperature dependence of the CRSS is analyzed in terms of a model based on partial dislocations overcoming a steep and high Peierls potential. Parameters for the model can be chosen to explain the observed values of T sub 0 and the CRSS extrapolated to T=0K for both spinel and sapphire. Other models are possible. The dependence of CRSS on [V sub c ] exp -2 can be explained in terms of kink nucleation at cation vacancies.</description><identifier>ISSN: 1359-6462</identifier><identifier>EISSN: 1872-8456</identifier><identifier>DOI: 10.1016/S1359-6462(98)00194-8</identifier><language>eng</language><publisher>New York, NY: Elsevier Ltd</publisher><subject>ALUMINIUM OXIDES ; Condensed matter: structure, mechanical and thermal properties ; DISLOCATIONS ; Exact sciences and technology ; Fatigue, brittleness, fracture, and cracks ; MAGNESIUM OXIDES ; MATERIALS SCIENCE ; Mechanical and acoustical properties of condensed matter ; Mechanical properties of solids ; MICROSTRUCTURE ; Physics ; SHEAR PROPERTIES ; SLIP ; STOICHIOMETRY ; TEMPERATURE DEPENDENCE ; VACANCIES</subject><ispartof>Scripta Materialia, 1998-08, Vol.39 (4), p.537-544</ispartof><rights>1998</rights><rights>1999 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/S1359-6462(98)00194-8$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>309,310,314,780,784,789,790,885,3550,23930,23931,25140,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=1595229$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/651149$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Mitchell, T.E.</creatorcontrib><creatorcontrib>Donlon, W.T.</creatorcontrib><creatorcontrib>Heuer, A.H.</creatorcontrib><title>Solution softening in spinel</title><title>Scripta Materialia</title><description>The critical resolved shear stress of MgO.nAl sub 2 O sub 3 spinel at a given temperature decreases dramatically, by almost two orders of magnitude, with increasing deviation from stoichiometry, i.e., as n increases from 1-3.5. The CRSS is proportional to exp(-T/T sub 0 ) and to [V sub c ] exp -2 , where T sub 0 is a characteristic temperature and [V sub c ] is the concentration of charge-compensating cation vacancies. Slip on {111} planes is thought to occur between the Kagome cation layers and the adjacent anion layers. Slip on {101} planes is slightly easier (and has a higher T sub 0 ) because the planes are more widely separated. Slip in spinel does not require synchro-shear, unlike slip in the C15 AB sub 2 Laves phase, which has identical metal atom positions to the cation positions in spinel. The temperature dependence of the CRSS is analyzed in terms of a model based on partial dislocations overcoming a steep and high Peierls potential. Parameters for the model can be chosen to explain the observed values of T sub 0 and the CRSS extrapolated to T=0K for both spinel and sapphire. Other models are possible. The dependence of CRSS on [V sub c ] exp -2 can be explained in terms of kink nucleation at cation vacancies.</description><subject>ALUMINIUM OXIDES</subject><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>DISLOCATIONS</subject><subject>Exact sciences and technology</subject><subject>Fatigue, brittleness, fracture, and cracks</subject><subject>MAGNESIUM OXIDES</subject><subject>MATERIALS SCIENCE</subject><subject>Mechanical and acoustical properties of condensed matter</subject><subject>Mechanical properties of solids</subject><subject>MICROSTRUCTURE</subject><subject>Physics</subject><subject>SHEAR PROPERTIES</subject><subject>SLIP</subject><subject>STOICHIOMETRY</subject><subject>TEMPERATURE DEPENDENCE</subject><subject>VACANCIES</subject><issn>1359-6462</issn><issn>1872-8456</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><recordid>eNo1kE1LAzEQhoMoWKv_QKGCiB5WM2mSTU4ixS8oeKieQzY70cg2qZut4L93t62n-eDhHeYh5AzoDVCQtwuYCl1ILtmVVteUguaF2iMjUCUrFBdyv-__kUNylPMXpVQCgxE5XaRm3YUUJzn5DmOIH5PQD6sQsTkmB942GU92dUzeHx_eZs_F_PXpZXY_L5Bp0RWy9qWnXgCWFUVaaomWg9Yg1JR5W1c11b6yZS2oqDj0S8G5455KrWtm2XRMzre5KXfBZBc6dJ8uxYiuM1IAcN0zl1tm1abvNebOLEN22DQ2Ylpnw2QplQDRgxc70GZnG9_a6EI2qzYsbftrQGjB2JB3t8Wwf-wnYDvcxeiwDu1wtk7BADWDYLMRbAZ7RiuzEWzU9A8X2Gx9</recordid><startdate>19980804</startdate><enddate>19980804</enddate><creator>Mitchell, T.E.</creator><creator>Donlon, W.T.</creator><creator>Heuer, A.H.</creator><general>Elsevier Ltd</general><general>Elsevier Science</general><scope>IQODW</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope><scope>OTOTI</scope></search><sort><creationdate>19980804</creationdate><title>Solution softening in spinel</title><author>Mitchell, T.E. ; Donlon, W.T. ; Heuer, A.H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-e295t-6df7f0f51e7b0e0796ea419915832fadbd09fba7d505b41832544c4f0699d2a23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>ALUMINIUM OXIDES</topic><topic>Condensed matter: structure, mechanical and thermal properties</topic><topic>DISLOCATIONS</topic><topic>Exact sciences and technology</topic><topic>Fatigue, brittleness, fracture, and cracks</topic><topic>MAGNESIUM OXIDES</topic><topic>MATERIALS SCIENCE</topic><topic>Mechanical and acoustical properties of condensed matter</topic><topic>Mechanical properties of solids</topic><topic>MICROSTRUCTURE</topic><topic>Physics</topic><topic>SHEAR PROPERTIES</topic><topic>SLIP</topic><topic>STOICHIOMETRY</topic><topic>TEMPERATURE DEPENDENCE</topic><topic>VACANCIES</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mitchell, T.E.</creatorcontrib><creatorcontrib>Donlon, W.T.</creatorcontrib><creatorcontrib>Heuer, A.H.</creatorcontrib><collection>Pascal-Francis</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>OSTI.GOV</collection><jtitle>Scripta Materialia</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mitchell, T.E.</au><au>Donlon, W.T.</au><au>Heuer, A.H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Solution softening in spinel</atitle><jtitle>Scripta Materialia</jtitle><date>1998-08-04</date><risdate>1998</risdate><volume>39</volume><issue>4</issue><spage>537</spage><epage>544</epage><pages>537-544</pages><issn>1359-6462</issn><eissn>1872-8456</eissn><abstract>The critical resolved shear stress of MgO.nAl sub 2 O sub 3 spinel at a given temperature decreases dramatically, by almost two orders of magnitude, with increasing deviation from stoichiometry, i.e., as n increases from 1-3.5. The CRSS is proportional to exp(-T/T sub 0 ) and to [V sub c ] exp -2 , where T sub 0 is a characteristic temperature and [V sub c ] is the concentration of charge-compensating cation vacancies. Slip on {111} planes is thought to occur between the Kagome cation layers and the adjacent anion layers. Slip on {101} planes is slightly easier (and has a higher T sub 0 ) because the planes are more widely separated. Slip in spinel does not require synchro-shear, unlike slip in the C15 AB sub 2 Laves phase, which has identical metal atom positions to the cation positions in spinel. The temperature dependence of the CRSS is analyzed in terms of a model based on partial dislocations overcoming a steep and high Peierls potential. Parameters for the model can be chosen to explain the observed values of T sub 0 and the CRSS extrapolated to T=0K for both spinel and sapphire. Other models are possible. The dependence of CRSS on [V sub c ] exp -2 can be explained in terms of kink nucleation at cation vacancies.</abstract><cop>New York, NY</cop><pub>Elsevier Ltd</pub><doi>10.1016/S1359-6462(98)00194-8</doi><tpages>8</tpages></addata></record> |
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subjects | ALUMINIUM OXIDES Condensed matter: structure, mechanical and thermal properties DISLOCATIONS Exact sciences and technology Fatigue, brittleness, fracture, and cracks MAGNESIUM OXIDES MATERIALS SCIENCE Mechanical and acoustical properties of condensed matter Mechanical properties of solids MICROSTRUCTURE Physics SHEAR PROPERTIES SLIP STOICHIOMETRY TEMPERATURE DEPENDENCE VACANCIES |
title | Solution softening in spinel |
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