Thermodynamic and Kinetic Simulations Used for the Study of the Influence of Precipitates on Thermophysical Properties in NiTiCu Alloys Obtained by Spark Plasma Sintering
The thermodynamic and kinetic simulations based on the re-assessment of the thermodynamic and kinetic database of the Ni-Ti-Cu system were employed to predict the phenomena of mechanical alloying, spark plasma sintering and thermal properties of the intriguing Ni-Ti-Cu system. Thermodynamic calculat...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-03-01
|
| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/14/5/461 |
| _version_ | 1797264085916581888 |
|---|---|
| author | Cristiana Diana Cirstea Erwin Povoden-Karadeniz Vasile Cirstea Felicia Tolea Ernst Kozeschnik |
| author_facet | Cristiana Diana Cirstea Erwin Povoden-Karadeniz Vasile Cirstea Felicia Tolea Ernst Kozeschnik |
| author_sort | Cristiana Diana Cirstea |
| collection | DOAJ |
| description | The thermodynamic and kinetic simulations based on the re-assessment of the thermodynamic and kinetic database of the Ni-Ti-Cu system were employed to predict the phenomena of mechanical alloying, spark plasma sintering and thermal properties of the intriguing Ni-Ti-Cu system. Thermodynamic calculations are presented for the stable and unstable phases of NiTiCu materials and support a correlation with the evolving microstructure during the technological process. Also, the thermal conductivity, the thermal diffusivity and the specific heat of spark plasma sintered and aged Cu-alloyed NiTi-based shape memory alloys (NiTiCu) with two compositions, Ni<sub>45</sub>Ti<sub>50</sub>Cu<sub>5</sub> and Ni<sub>40</sub>Ti<sub>50</sub>Cu<sub>10</sub>, are evaluated and the influence of mechanical alloying and precipitates on thermal properties is discussed. Measurements of these thermal properties were carried out from 25 °C up to 175 °C using the laser flash method, as well as differential scanning calorimetry. The thermal hysteresis of the 20 mm diameter samples was between 8.8 and 24.5 °C. The observed <i>T</i><sub>0</sub> temperatures from DSC experimental transformation features are in reasonable accordance with the thermodynamic predictions. The determined <i>k</i> values are between 20.04 and 26.87 W/m K and in agreement with the literature results. Moreover, this paper can provide some suggestions for the preparation of NiTiCu shape memory alloys and their applications. |
| first_indexed | 2024-04-25T00:23:18Z |
| format | Article |
| id | doaj.art-661d64000c7d43fb9b5c1a0a07a7f4e8 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-04-25T00:23:18Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-661d64000c7d43fb9b5c1a0a07a7f4e82024-03-12T16:51:40ZengMDPI AGNanomaterials2079-49912024-03-0114546110.3390/nano14050461Thermodynamic and Kinetic Simulations Used for the Study of the Influence of Precipitates on Thermophysical Properties in NiTiCu Alloys Obtained by Spark Plasma SinteringCristiana Diana Cirstea0Erwin Povoden-Karadeniz1Vasile Cirstea2Felicia Tolea3Ernst Kozeschnik4National Institute for Research and Development in Electrical Engineering ICPE-CA (INCDIE ICPE-CA), Splaiul Unirii 313, 030138 Bucharest, RomaniaChristian Doppler Laboratory for Interfaces and Precipitation Engineering CDL-IPE, Institute of Materials Science and Technology, TU Wien, Getreidemarkt 9, 1060 Vienna, AustriaMilitary Equipments and Technology Research Agency, Aeroportului 16, 077025 Clinceni, RomaniaNational Institute of Materials Physics (INCDFM), 105 bis Atomistilor Str., 077125 Magurele, RomaniaInstitute of Materials Science and Technology, TU Wien, Getreidemarkt 9, 1060 Vienna, AustriaThe thermodynamic and kinetic simulations based on the re-assessment of the thermodynamic and kinetic database of the Ni-Ti-Cu system were employed to predict the phenomena of mechanical alloying, spark plasma sintering and thermal properties of the intriguing Ni-Ti-Cu system. Thermodynamic calculations are presented for the stable and unstable phases of NiTiCu materials and support a correlation with the evolving microstructure during the technological process. Also, the thermal conductivity, the thermal diffusivity and the specific heat of spark plasma sintered and aged Cu-alloyed NiTi-based shape memory alloys (NiTiCu) with two compositions, Ni<sub>45</sub>Ti<sub>50</sub>Cu<sub>5</sub> and Ni<sub>40</sub>Ti<sub>50</sub>Cu<sub>10</sub>, are evaluated and the influence of mechanical alloying and precipitates on thermal properties is discussed. Measurements of these thermal properties were carried out from 25 °C up to 175 °C using the laser flash method, as well as differential scanning calorimetry. The thermal hysteresis of the 20 mm diameter samples was between 8.8 and 24.5 °C. The observed <i>T</i><sub>0</sub> temperatures from DSC experimental transformation features are in reasonable accordance with the thermodynamic predictions. The determined <i>k</i> values are between 20.04 and 26.87 W/m K and in agreement with the literature results. Moreover, this paper can provide some suggestions for the preparation of NiTiCu shape memory alloys and their applications.https://www.mdpi.com/2079-4991/14/5/461thermodynamic computationshape memorymartensitic transformationthermal hysteresisthermal conductivity |
| spellingShingle | Cristiana Diana Cirstea Erwin Povoden-Karadeniz Vasile Cirstea Felicia Tolea Ernst Kozeschnik Thermodynamic and Kinetic Simulations Used for the Study of the Influence of Precipitates on Thermophysical Properties in NiTiCu Alloys Obtained by Spark Plasma Sintering Nanomaterials thermodynamic computation shape memory martensitic transformation thermal hysteresis thermal conductivity |
| title | Thermodynamic and Kinetic Simulations Used for the Study of the Influence of Precipitates on Thermophysical Properties in NiTiCu Alloys Obtained by Spark Plasma Sintering |
| title_full | Thermodynamic and Kinetic Simulations Used for the Study of the Influence of Precipitates on Thermophysical Properties in NiTiCu Alloys Obtained by Spark Plasma Sintering |
| title_fullStr | Thermodynamic and Kinetic Simulations Used for the Study of the Influence of Precipitates on Thermophysical Properties in NiTiCu Alloys Obtained by Spark Plasma Sintering |
| title_full_unstemmed | Thermodynamic and Kinetic Simulations Used for the Study of the Influence of Precipitates on Thermophysical Properties in NiTiCu Alloys Obtained by Spark Plasma Sintering |
| title_short | Thermodynamic and Kinetic Simulations Used for the Study of the Influence of Precipitates on Thermophysical Properties in NiTiCu Alloys Obtained by Spark Plasma Sintering |
| title_sort | thermodynamic and kinetic simulations used for the study of the influence of precipitates on thermophysical properties in niticu alloys obtained by spark plasma sintering |
| topic | thermodynamic computation shape memory martensitic transformation thermal hysteresis thermal conductivity |
| url | https://www.mdpi.com/2079-4991/14/5/461 |
| work_keys_str_mv | AT cristianadianacirstea thermodynamicandkineticsimulationsusedforthestudyoftheinfluenceofprecipitatesonthermophysicalpropertiesinniticualloysobtainedbysparkplasmasintering AT erwinpovodenkaradeniz thermodynamicandkineticsimulationsusedforthestudyoftheinfluenceofprecipitatesonthermophysicalpropertiesinniticualloysobtainedbysparkplasmasintering AT vasilecirstea thermodynamicandkineticsimulationsusedforthestudyoftheinfluenceofprecipitatesonthermophysicalpropertiesinniticualloysobtainedbysparkplasmasintering AT feliciatolea thermodynamicandkineticsimulationsusedforthestudyoftheinfluenceofprecipitatesonthermophysicalpropertiesinniticualloysobtainedbysparkplasmasintering AT ernstkozeschnik thermodynamicandkineticsimulationsusedforthestudyoftheinfluenceofprecipitatesonthermophysicalpropertiesinniticualloysobtainedbysparkplasmasintering |