Tension/compression asymmetry in yield and creep strengths of ni-based superalloys
The tension/compression asymmetries of yield and creep strengths of three kinds of single-crystal superalloys-PWA1480, CMSX-4, and TMS-75 - and a DS superalloy, Mar-M247LC, were investigated at intermediate and high temperatures. In PWA1480, tensile yield strength was higher than the compressive str...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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2008
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| _version_ | 1797074838807904256 |
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| author | Tsuno, N Shimabayashi, S Kakehi, K Rae, C Reed, R |
| author_facet | Tsuno, N Shimabayashi, S Kakehi, K Rae, C Reed, R |
| author_sort | Tsuno, N |
| collection | OXFORD |
| description | The tension/compression asymmetries of yield and creep strengths of three kinds of single-crystal superalloys-PWA1480, CMSX-4, and TMS-75 - and a DS superalloy, Mar-M247LC, were investigated at intermediate and high temperatures. In PWA1480, tensile yield strength was higher than the compressive strength from 20°C to 750°C From the TEM observation, it was found that the asymmetry of yield strengths is primarily due to the microtwin formation associated with a superlattice extrinsic stacking fault (SESF). In CMSX-4 and TMS-75, tensile/compressive yield strengths were comparable at every temperature, and shearing of γ′ precipitates by a/2〈110〉 dislocations pairs was the dominant deformation mechanism in both tensile and compressive tests at 750°C The creep response of these materials were quite different than their yielding response. CMSX-4 and TMS-75 showed distinctive creep tension/compression asymmetry. These two alloys showed large creep strain caused by {111}〈112〉 slip at 750°C under tensile stress, and mechanical twins at 750°C and 900°C under compressive stresses. Tension/compression asymmetry of CMSX-4 and TMS-75 was larger at 900°C than at 750°C because 〈112〉 viscous slip was not observed under tensile stress at 900°C The asymmetric nature of PWA1480 was small at both 750°C and 900°C because the dominant deformation mode in both tension and compression is a combination of both a/2〈110〉 dislocation's bowing on the {111} plane in the matrix and climbing along the γ/γ′ interfaces. |
| first_indexed | 2024-03-06T23:42:01Z |
| format | Journal article |
| id | oxford-uuid:6fa41d54-a6dc-43a0-8e44-61fac53e0f3f |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:42:01Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:6fa41d54-a6dc-43a0-8e44-61fac53e0f3f2022-03-26T19:31:53ZTension/compression asymmetry in yield and creep strengths of ni-based superalloysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:6fa41d54-a6dc-43a0-8e44-61fac53e0f3fEnglishSymplectic Elements at Oxford2008Tsuno, NShimabayashi, SKakehi, KRae, CReed, RThe tension/compression asymmetries of yield and creep strengths of three kinds of single-crystal superalloys-PWA1480, CMSX-4, and TMS-75 - and a DS superalloy, Mar-M247LC, were investigated at intermediate and high temperatures. In PWA1480, tensile yield strength was higher than the compressive strength from 20°C to 750°C From the TEM observation, it was found that the asymmetry of yield strengths is primarily due to the microtwin formation associated with a superlattice extrinsic stacking fault (SESF). In CMSX-4 and TMS-75, tensile/compressive yield strengths were comparable at every temperature, and shearing of γ′ precipitates by a/2〈110〉 dislocations pairs was the dominant deformation mechanism in both tensile and compressive tests at 750°C The creep response of these materials were quite different than their yielding response. CMSX-4 and TMS-75 showed distinctive creep tension/compression asymmetry. These two alloys showed large creep strain caused by {111}〈112〉 slip at 750°C under tensile stress, and mechanical twins at 750°C and 900°C under compressive stresses. Tension/compression asymmetry of CMSX-4 and TMS-75 was larger at 900°C than at 750°C because 〈112〉 viscous slip was not observed under tensile stress at 900°C The asymmetric nature of PWA1480 was small at both 750°C and 900°C because the dominant deformation mode in both tension and compression is a combination of both a/2〈110〉 dislocation's bowing on the {111} plane in the matrix and climbing along the γ/γ′ interfaces. |
| spellingShingle | Tsuno, N Shimabayashi, S Kakehi, K Rae, C Reed, R Tension/compression asymmetry in yield and creep strengths of ni-based superalloys |
| title | Tension/compression asymmetry in yield and creep strengths of ni-based superalloys |
| title_full | Tension/compression asymmetry in yield and creep strengths of ni-based superalloys |
| title_fullStr | Tension/compression asymmetry in yield and creep strengths of ni-based superalloys |
| title_full_unstemmed | Tension/compression asymmetry in yield and creep strengths of ni-based superalloys |
| title_short | Tension/compression asymmetry in yield and creep strengths of ni-based superalloys |
| title_sort | tension compression asymmetry in yield and creep strengths of ni based superalloys |
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