Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys
•Oxygen isotopic exchange used to examine effectiveness of oxide scales.•Co/Ni superalloys achieved that produce only 1μm scales on oxidation at 800°C for 200h.•STEM characterisation of the scales performed. Oxidation mechanisms in polycrystalline Co–Ni–Cr–Al–W–Ta alloys were investigated using O16/...
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| Veröffentlicht in: | Corrosion science 2017-02, Vol.116, p.44-52 |
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| container_title | Corrosion science |
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| creator | Ismail, F.B. Vorontsov, V.A. Lindley, T.C. Hardy, M.C. Dye, D. Shollock, B.A. |
| description | •Oxygen isotopic exchange used to examine effectiveness of oxide scales.•Co/Ni superalloys achieved that produce only 1μm scales on oxidation at 800°C for 200h.•STEM characterisation of the scales performed.
Oxidation mechanisms in polycrystalline Co–Ni–Cr–Al–W–Ta alloys were investigated using O16/O18 isotopic tracer analysis in the focused ion-beam secondary ion mass spectrometer (FIB-SIMS). It was found that Al additions favour the formation of a continuous alumina-rich layer, that Cr indirectly improved oxidation resistance and that increasing the Co fraction resulted in poorer oxidation performance. In the alloy containing 15 at.% Cr and 10 at.% Al, the outer scale formed after 200h oxidation at 800°C comprised oxides less than 1μm thick. It is concluded that protective oxide scales can be formed in Co–Ni base superalloys. |
| doi_str_mv | 10.1016/j.corsci.2016.12.009 |
| format | Article |
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Oxidation mechanisms in polycrystalline Co–Ni–Cr–Al–W–Ta alloys were investigated using O16/O18 isotopic tracer analysis in the focused ion-beam secondary ion mass spectrometer (FIB-SIMS). It was found that Al additions favour the formation of a continuous alumina-rich layer, that Cr indirectly improved oxidation resistance and that increasing the Co fraction resulted in poorer oxidation performance. In the alloy containing 15 at.% Cr and 10 at.% Al, the outer scale formed after 200h oxidation at 800°C comprised oxides less than 1μm thick. It is concluded that protective oxide scales can be formed in Co–Ni base superalloys.</description><subject>Alloying effects</subject><subject>Aluminum oxide</subject><subject>Beryllium</subject><subject>Chromium base alloys</subject><subject>Cobalt base alloys</subject><subject>Ion beams</subject><subject>Nickel base alloys</subject><subject>Oxidation</subject><subject>Oxidation resistance</subject><subject>Oxides</subject><subject>Polycrystals</subject><subject>Scale (corrosion)</subject><subject>Secondary ion mass spectrometry</subject><subject>SIMS</subject><subject>STEM</subject><subject>Superalloys</subject><subject>Tantalum base alloys</subject><subject>Tungsten base alloys</subject><issn>0010-938X</issn><issn>1879-0496</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp9kM9KxDAQxoMouK6-gYeC59ZJ2qbNRZDFf7DoZQVvIU2nmtJt1qQr9uY7-IY-iSn1LHOYGfjmG74fIecUEgqUX7aJts5rk7CwJZQlAOKALGhZiBgywQ_JAoBCLNLy5ZiceN8CQNDCgmyuu86Opn-NsGlQDz6yfWQ_Ta0GE6Yt6jfVG7_1kemjne1G7UY_qK4zPUYr-_P1_WiiSnmM_H6HTk1u_pQcNarzePbXl-T59mazuo_XT3cPq-t1rNMShpjriiLNAKGu0maqkKYsmVJ5BZrToq5KVeRcs5TlwGlTZEgFcpbRMhW5TpfkYvbdOfu-Rz_I1u5dH15KKlJGBct4HlTZrNLOeu-wkTtntsqNkoKc-MlWzvzkxE9SJgO_cHY1n2FI8GHQyaDAXmNtXAAla2v-N_gF7GF8RA</recordid><startdate>20170215</startdate><enddate>20170215</enddate><creator>Ismail, F.B.</creator><creator>Vorontsov, V.A.</creator><creator>Lindley, T.C.</creator><creator>Hardy, M.C.</creator><creator>Dye, D.</creator><creator>Shollock, B.A.</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SE</scope><scope>8BQ</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>JG9</scope></search><sort><creationdate>20170215</creationdate><title>Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys</title><author>Ismail, F.B. ; Vorontsov, V.A. ; Lindley, T.C. ; Hardy, M.C. ; Dye, D. ; Shollock, B.A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c380t-6cb1e140e0db3f3f3f101882aa5b0c617db8a756c2325061f74e19e62418395c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Alloying effects</topic><topic>Aluminum oxide</topic><topic>Beryllium</topic><topic>Chromium base alloys</topic><topic>Cobalt base alloys</topic><topic>Ion beams</topic><topic>Nickel base alloys</topic><topic>Oxidation</topic><topic>Oxidation resistance</topic><topic>Oxides</topic><topic>Polycrystals</topic><topic>Scale (corrosion)</topic><topic>Secondary ion mass spectrometry</topic><topic>SIMS</topic><topic>STEM</topic><topic>Superalloys</topic><topic>Tantalum base alloys</topic><topic>Tungsten base alloys</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ismail, F.B.</creatorcontrib><creatorcontrib>Vorontsov, V.A.</creatorcontrib><creatorcontrib>Lindley, T.C.</creatorcontrib><creatorcontrib>Hardy, M.C.</creatorcontrib><creatorcontrib>Dye, D.</creatorcontrib><creatorcontrib>Shollock, B.A.</creatorcontrib><collection>CrossRef</collection><collection>Corrosion Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><jtitle>Corrosion science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ismail, F.B.</au><au>Vorontsov, V.A.</au><au>Lindley, T.C.</au><au>Hardy, M.C.</au><au>Dye, D.</au><au>Shollock, B.A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys</atitle><jtitle>Corrosion science</jtitle><date>2017-02-15</date><risdate>2017</risdate><volume>116</volume><spage>44</spage><epage>52</epage><pages>44-52</pages><issn>0010-938X</issn><eissn>1879-0496</eissn><abstract>•Oxygen isotopic exchange used to examine effectiveness of oxide scales.•Co/Ni superalloys achieved that produce only 1μm scales on oxidation at 800°C for 200h.•STEM characterisation of the scales performed.
Oxidation mechanisms in polycrystalline Co–Ni–Cr–Al–W–Ta alloys were investigated using O16/O18 isotopic tracer analysis in the focused ion-beam secondary ion mass spectrometer (FIB-SIMS). It was found that Al additions favour the formation of a continuous alumina-rich layer, that Cr indirectly improved oxidation resistance and that increasing the Co fraction resulted in poorer oxidation performance. In the alloy containing 15 at.% Cr and 10 at.% Al, the outer scale formed after 200h oxidation at 800°C comprised oxides less than 1μm thick. It is concluded that protective oxide scales can be formed in Co–Ni base superalloys.</abstract><cop>Amsterdam</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.corsci.2016.12.009</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Corrosion science, 2017-02, Vol.116, p.44-52 |
| issn | 0010-938X 1879-0496 |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Alloying effects Aluminum oxide Beryllium Chromium base alloys Cobalt base alloys Ion beams Nickel base alloys Oxidation Oxidation resistance Oxides Polycrystals Scale (corrosion) Secondary ion mass spectrometry SIMS STEM Superalloys Tantalum base alloys Tungsten base alloys |
| title | Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys |
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