Microstructure and Shape Memory Characteristics of Powder-Metallurgical-Processed Ti-Ni-Cu Alloys
DC Field | Value | Language |
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dc.contributor.author | Kim, Yeon-Wook | - |
dc.contributor.author | Chung, Young-Soo | - |
dc.contributor.author | Choi, Eunsoo | - |
dc.contributor.author | Nam, Tae-Hyun | - |
dc.date.accessioned | 2023-03-08T22:14:34Z | - |
dc.date.available | 2023-03-08T22:14:34Z | - |
dc.date.issued | 2012-08 | - |
dc.identifier.issn | 1073-5623 | - |
dc.identifier.issn | 1543-1940 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/64995 | - |
dc.description.abstract | Even though Ti-Ni-Cu alloys have attracted a lot of attention because of their high performance in shape memory effect and decrease in thermal and stress hysteresis compared with Ti-Ni binary alloys, their poor workability restrains the practical applications of Ti-Ni-Cu shape memory alloys. Consolidation of Ti-Ni-Cu alloy powders is useful for the fabrication of bulk near-net-shape shape memory alloy. Ti50Ni30Cu20 shape memory alloy powders were prepared by gas atomization, and the sieved powders with the specific size range of 25 to 150 mu m were chosen for this study. The evaluation of powder microstructures was based on a scanning electron microscope (SEM) examination of the surface and the polished and etched powder cross sections. The typical images showed cellular/dendrite morphology and high population of small shrinkage cavities at intercellular regions. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) analysis showed that a B2-B19 one-step martensitic transformation occurred in the as-atomized powders. The martensitic transformation start temperature (M-s) of powders ranging between 25 and 50 mu m was 304.5 K (31.5 A degrees C). The M-s increased with increasing powder size. However, the difference of M-s in the as-atomized powders ranging between 25 and 150 mu m was only 274 K (1 A degrees C). A dense cylindrical specimen of 10 mm diameter and 15 mm length were fabricated by spark plasma sintering (SPS) at 1073 K (800 A degrees C) and 10 MPa for 20 minutes. Then, this bulk specimen was heat treated for 60 minutes at 1123 K (850 A degrees C) and quenched in ice water. The M-s of the SPS specimen was 310.5 K (37.5 A degrees C) whereas the M-s of conventionally cast ingot is found to be as high as 352.7 K (79.7 A degrees C). It is considered that the depression of the M-s in rapidly solidified powders is ascribed to the density of dislocations and the stored energy produced by rapid solidification. | - |
dc.format.extent | 7 | - |
dc.language | 영어 | - |
dc.language.iso | ENG | - |
dc.publisher | SPRINGER | - |
dc.title | Microstructure and Shape Memory Characteristics of Powder-Metallurgical-Processed Ti-Ni-Cu Alloys | - |
dc.type | Article | - |
dc.identifier.doi | 10.1007/s11661-011-0980-9 | - |
dc.identifier.bibliographicCitation | METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v.43A, no.8, pp 2932 - 2938 | - |
dc.description.isOpenAccess | N | - |
dc.identifier.wosid | 000305732900049 | - |
dc.identifier.scopusid | 2-s2.0-84864606765 | - |
dc.citation.endPage | 2938 | - |
dc.citation.number | 8 | - |
dc.citation.startPage | 2932 | - |
dc.citation.title | METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | - |
dc.citation.volume | 43A | - |
dc.type.docType | Article; Proceedings Paper | - |
dc.publisher.location | 미국 | - |
dc.subject.keywordPlus | PHASE | - |
dc.subject.keywordPlus | TRANSFORMATION | - |
dc.subject.keywordPlus | BEHAVIOR | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalResearchArea | Metallurgy & Metallurgical Engineering | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Metallurgy & Metallurgical Engineering | - |
dc.description.journalRegisteredClass | sci | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
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