Martensitic transformation of NiTi nanocrystals embedded in an amorphous matrix
The influence of the size on the martensitic phase transformation of spherical NiTi nanocrystals embedded in an amorphous matrix was studied by transmission electron microscopy. The transformation from B2 austenite to B19′ martensite is suppressed by a transformation barrier that increases with incr...
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| Veröffentlicht in: | Acta materialia 2004-11, Vol.52 (19), p.5461-5469 |
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| container_title | Acta materialia |
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| creator | Waitz, T. Karnthaler, H.P. |
| description | The influence of the size on the martensitic phase transformation of spherical NiTi nanocrystals embedded in an amorphous matrix was studied by transmission electron microscopy. The transformation from B2 austenite to B19′ martensite is suppressed by a transformation barrier that increases with increasing transformation strains and decreasing diameter of the nanocrystals. Minimizing the strain and interface energy yields a two step transformation from B2 to the R-phase and finally to B19′. The transformation starts at the crystalline/amorphous interface by heterogeneous nucleation. In the case of the R-phase to B19′ transformation large strains occur causing after a certain point fine compound twinning during growth that finally leads to a complete transformation right up to the interface. In the isolated nanocrystals a lack of collective transformation effects yields larger transformation barriers and causes larger critical diameters than those observed in the grains of nanocrystalline NiTi. |
| doi_str_mv | 10.1016/j.actamat.2004.08.003 |
| format | Article |
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The transformation from B2 austenite to B19′ martensite is suppressed by a transformation barrier that increases with increasing transformation strains and decreasing diameter of the nanocrystals. Minimizing the strain and interface energy yields a two step transformation from B2 to the R-phase and finally to B19′. The transformation starts at the crystalline/amorphous interface by heterogeneous nucleation. In the case of the R-phase to B19′ transformation large strains occur causing after a certain point fine compound twinning during growth that finally leads to a complete transformation right up to the interface. 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The transformation from B2 austenite to B19′ martensite is suppressed by a transformation barrier that increases with increasing transformation strains and decreasing diameter of the nanocrystals. Minimizing the strain and interface energy yields a two step transformation from B2 to the R-phase and finally to B19′. The transformation starts at the crystalline/amorphous interface by heterogeneous nucleation. In the case of the R-phase to B19′ transformation large strains occur causing after a certain point fine compound twinning during growth that finally leads to a complete transformation right up to the interface. In the isolated nanocrystals a lack of collective transformation effects yields larger transformation barriers and causes larger critical diameters than those observed in the grains of nanocrystalline NiTi.</description><subject>AUSTENITE</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Crystalline/amorphous interface</subject><subject>CRYSTALS</subject><subject>Exact sciences and technology</subject><subject>INTERFACES</subject><subject>MARTENSITE</subject><subject>Martensitic phase transformation</subject><subject>Martensitic transformations</subject><subject>MATERIALS SCIENCE</subject><subject>Nanocrystals</subject><subject>NANOSTRUCTURES</subject><subject>NICKEL ALLOYS</subject><subject>NiTi</subject><subject>Phase diagrams and microstructures developed by solidification and solid-solid phase transformations</subject><subject>PHASE TRANSFORMATIONS</subject><subject>Physics</subject><subject>STRAINS</subject><subject>TITANIUM ALLOYS</subject><subject>TRANSMISSION ELECTRON MICROSCOPY</subject><subject>TWINNING</subject><issn>1359-6454</issn><issn>1873-2453</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2004</creationdate><recordtype>article</recordtype><recordid>eNqNkU-LFDEQxYMouI5-BKFB9NZt_nXSfRJZVndhdS_rOaQrFTbDdDImWXG_vWlmwKNCoHL4vVdVrwh5y-jAKFMf94OFaldbB06pHOg0UCqekQs2adFzOYrn7S_GuVdylC_Jq1L2lDKuJb0gd99srhhLqAG6mm0sPuVmFVLsku--h_vQRRsT5KdS7aF0uC7oHLouxM62t6Z8fEiPpWuiHH6_Ji98w_DNue7Ijy9X95fX_e3d15vLz7c9yFnUfpxnEN55BpJJy0exgBYeKQrnFNWUq8VOCpdpEXTRINzEOHhv59lxYYUWO_Lu5JtKDaZAqAgPkGJEqIZTJeTUQtiRDyfqmNPPRyzVrKEAHg42YpvZ8KnFo-b_APWsuGKygeMJhJxKyejNMYfV5ifDqNmuYfbmfA2zXcPQybRBmu79uYEtYA--JQ2h_BUrzrTQm_-nE4ctvF8B87YbRkAX8raaS-Efnf4A6bqjEg</recordid><startdate>20041108</startdate><enddate>20041108</enddate><creator>Waitz, T.</creator><creator>Karnthaler, H.P.</creator><general>Elsevier Ltd</general><general>Elsevier Science</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7U5</scope><scope>8BQ</scope><scope>JG9</scope><scope>OTOTI</scope></search><sort><creationdate>20041108</creationdate><title>Martensitic transformation of NiTi nanocrystals embedded in an amorphous matrix</title><author>Waitz, T. ; Karnthaler, H.P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c493t-599c3fdf1c414a253bc73fe0e3dd607026ba86eb8b30b7c3d812cffa99d23a373</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2004</creationdate><topic>AUSTENITE</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Crystalline/amorphous interface</topic><topic>CRYSTALS</topic><topic>Exact sciences and technology</topic><topic>INTERFACES</topic><topic>MARTENSITE</topic><topic>Martensitic phase transformation</topic><topic>Martensitic transformations</topic><topic>MATERIALS SCIENCE</topic><topic>Nanocrystals</topic><topic>NANOSTRUCTURES</topic><topic>NICKEL ALLOYS</topic><topic>NiTi</topic><topic>Phase diagrams and microstructures developed by solidification and solid-solid phase transformations</topic><topic>PHASE TRANSFORMATIONS</topic><topic>Physics</topic><topic>STRAINS</topic><topic>TITANIUM ALLOYS</topic><topic>TRANSMISSION ELECTRON MICROSCOPY</topic><topic>TWINNING</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Waitz, T.</creatorcontrib><creatorcontrib>Karnthaler, H.P.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Materials Research Database</collection><collection>OSTI.GOV</collection><jtitle>Acta materialia</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Waitz, T.</au><au>Karnthaler, H.P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Martensitic transformation of NiTi nanocrystals embedded in an amorphous matrix</atitle><jtitle>Acta materialia</jtitle><date>2004-11-08</date><risdate>2004</risdate><volume>52</volume><issue>19</issue><spage>5461</spage><epage>5469</epage><pages>5461-5469</pages><issn>1359-6454</issn><eissn>1873-2453</eissn><abstract>The influence of the size on the martensitic phase transformation of spherical NiTi nanocrystals embedded in an amorphous matrix was studied by transmission electron microscopy. The transformation from B2 austenite to B19′ martensite is suppressed by a transformation barrier that increases with increasing transformation strains and decreasing diameter of the nanocrystals. Minimizing the strain and interface energy yields a two step transformation from B2 to the R-phase and finally to B19′. The transformation starts at the crystalline/amorphous interface by heterogeneous nucleation. In the case of the R-phase to B19′ transformation large strains occur causing after a certain point fine compound twinning during growth that finally leads to a complete transformation right up to the interface. In the isolated nanocrystals a lack of collective transformation effects yields larger transformation barriers and causes larger critical diameters than those observed in the grains of nanocrystalline NiTi.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.actamat.2004.08.003</doi><tpages>9</tpages></addata></record> |
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| ispartof | Acta materialia, 2004-11, Vol.52 (19), p.5461-5469 |
| issn | 1359-6454 1873-2453 |
| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | AUSTENITE Cross-disciplinary physics: materials science rheology Crystalline/amorphous interface CRYSTALS Exact sciences and technology INTERFACES MARTENSITE Martensitic phase transformation Martensitic transformations MATERIALS SCIENCE Nanocrystals NANOSTRUCTURES NICKEL ALLOYS NiTi Phase diagrams and microstructures developed by solidification and solid-solid phase transformations PHASE TRANSFORMATIONS Physics STRAINS TITANIUM ALLOYS TRANSMISSION ELECTRON MICROSCOPY TWINNING |
| title | Martensitic transformation of NiTi nanocrystals embedded in an amorphous matrix |
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