Creep behavior of a[...]'-strengthened Co-base alloy with zero[...]/[...]'-lattice misfit at 800 °C, 196 MPa
Deformation and structural behavior of an experimental[...]'-strengthened Co-base alloy during creep at 800 °C and 196 MPa have been investigated. The characteristic features of this alloy are zero[...]/[...]'-lattice misfit and a fine[...]/[...]'-microstructure. In the initial condit...
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| Veröffentlicht in: | Journal of materials research 2017-12, Vol.32 (24), p.4466 |
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| creator | Midtlyng, Jan Epishin, Alexander I Petrushin, Nikolay V Link, Thomas Nolze, Gert Svetlov, Igor L Reimers, Walter |
| description | Deformation and structural behavior of an experimental[...]'-strengthened Co-base alloy during creep at 800 °C and 196 MPa have been investigated. The characteristic features of this alloy are zero[...]/[...]'-lattice misfit and a fine[...]/[...]'-microstructure. In the initial condition, the[...]'-precipitates in this alloy are small (size of about 100 nm), have polyhedral morphology, and are separated by the very narrow[...]-channels (width of about 10 nm). The tests performed up to about 1% creep strain (about 500 h creep time) gave creep curves with a slow constant strain rate and without an apparent transient creep, typical for superalloys with nonzero misfit. In this initial stage of creep, entering of the narrow[...]-channels by dislocations is blocked by a strong Orowan force. The micromechanism of creep was identified as an octahedral glide of [lang]011[rang] superdislocations simultaneously in two phases,[...]and[...]'. The[...]/[...]'-microstructure with zero misfit shows no rafting but rapidly coarsens isotropically. It is concluded that zero misfit is beneficial at the initial stages of the creep but is unfavourable for long-term creep because of the continuous microstructural coarsening. |
| doi_str_mv | 10.1557/jmr.2017.424 |
| format | Article |
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The characteristic features of this alloy are zero[...]/[...]'-lattice misfit and a fine[...]/[...]'-microstructure. In the initial condition, the[...]'-precipitates in this alloy are small (size of about 100 nm), have polyhedral morphology, and are separated by the very narrow[...]-channels (width of about 10 nm). The tests performed up to about 1% creep strain (about 500 h creep time) gave creep curves with a slow constant strain rate and without an apparent transient creep, typical for superalloys with nonzero misfit. In this initial stage of creep, entering of the narrow[...]-channels by dislocations is blocked by a strong Orowan force. The micromechanism of creep was identified as an octahedral glide of [lang]011[rang] superdislocations simultaneously in two phases,[...]and[...]'. The[...]/[...]'-microstructure with zero misfit shows no rafting but rapidly coarsens isotropically. It is concluded that zero misfit is beneficial at the initial stages of the creep but is unfavourable for long-term creep because of the continuous microstructural coarsening.</description><identifier>ISSN: 0884-2914</identifier><identifier>EISSN: 2044-5326</identifier><identifier>DOI: 10.1557/jmr.2017.424</identifier><language>eng</language><publisher>Warrendale: Springer Nature B.V</publisher><subject>Alloys ; Bridgman method ; Channels ; Coarsening ; Creep (materials) ; Creep tests ; Deformation ; Dislocations ; Heat ; High temperature ; Intermetallic compounds ; Materials research ; Microstructure ; Morphology ; Nickel ; Precipitates ; Scanning electron microscopy ; Single crystals ; Solid solutions ; Strain rate ; Superalloys ; Superdislocations ; Temperature</subject><ispartof>Journal of materials research, 2017-12, Vol.32 (24), p.4466</ispartof><rights>Copyright © Materials Research Society 2017</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Midtlyng, Jan</creatorcontrib><creatorcontrib>Epishin, Alexander I</creatorcontrib><creatorcontrib>Petrushin, Nikolay V</creatorcontrib><creatorcontrib>Link, Thomas</creatorcontrib><creatorcontrib>Nolze, Gert</creatorcontrib><creatorcontrib>Svetlov, Igor L</creatorcontrib><creatorcontrib>Reimers, Walter</creatorcontrib><title>Creep behavior of a[...]'-strengthened Co-base alloy with zero[...]/[...]'-lattice misfit at 800 °C, 196 MPa</title><title>Journal of materials research</title><description>Deformation and structural behavior of an experimental[...]'-strengthened Co-base alloy during creep at 800 °C and 196 MPa have been investigated. The characteristic features of this alloy are zero[...]/[...]'-lattice misfit and a fine[...]/[...]'-microstructure. In the initial condition, the[...]'-precipitates in this alloy are small (size of about 100 nm), have polyhedral morphology, and are separated by the very narrow[...]-channels (width of about 10 nm). The tests performed up to about 1% creep strain (about 500 h creep time) gave creep curves with a slow constant strain rate and without an apparent transient creep, typical for superalloys with nonzero misfit. In this initial stage of creep, entering of the narrow[...]-channels by dislocations is blocked by a strong Orowan force. The micromechanism of creep was identified as an octahedral glide of [lang]011[rang] superdislocations simultaneously in two phases,[...]and[...]'. The[...]/[...]'-microstructure with zero misfit shows no rafting but rapidly coarsens isotropically. 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The characteristic features of this alloy are zero[...]/[...]'-lattice misfit and a fine[...]/[...]'-microstructure. In the initial condition, the[...]'-precipitates in this alloy are small (size of about 100 nm), have polyhedral morphology, and are separated by the very narrow[...]-channels (width of about 10 nm). The tests performed up to about 1% creep strain (about 500 h creep time) gave creep curves with a slow constant strain rate and without an apparent transient creep, typical for superalloys with nonzero misfit. In this initial stage of creep, entering of the narrow[...]-channels by dislocations is blocked by a strong Orowan force. The micromechanism of creep was identified as an octahedral glide of [lang]011[rang] superdislocations simultaneously in two phases,[...]and[...]'. The[...]/[...]'-microstructure with zero misfit shows no rafting but rapidly coarsens isotropically. It is concluded that zero misfit is beneficial at the initial stages of the creep but is unfavourable for long-term creep because of the continuous microstructural coarsening.</abstract><cop>Warrendale</cop><pub>Springer Nature B.V</pub><doi>10.1557/jmr.2017.424</doi></addata></record> |
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| subjects | Alloys Bridgman method Channels Coarsening Creep (materials) Creep tests Deformation Dislocations Heat High temperature Intermetallic compounds Materials research Microstructure Morphology Nickel Precipitates Scanning electron microscopy Single crystals Solid solutions Strain rate Superalloys Superdislocations Temperature |
| title | Creep behavior of a[...]'-strengthened Co-base alloy with zero[...]/[...]'-lattice misfit at 800 °C, 196 MPa |
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