Order–Disorder-Type Transitions Through a Multifractal Procedure in Cu-Zn-Al Alloys—Experimental and Theoretical Design
Experimental and theoretical design on thermal and structural properties of Cu-Zn-Al alloys are established. As such, from an experimental point of view, differential thermal analysis has been performed with the help of a DSC Netzsch STA 449 F1 Jupiter calorimeter with high levels of sensitivity, an...
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2025-05-01
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| author | Constantin Plăcintă Valentin Nedeff Mirela Panainte-Lehăduş Elena Puiu Costescu Tudor-Cristian Petrescu Sergiu Stanciu Maricel Agop Diana-Carmen Mirilă Florin Nedeff |
| author_facet | Constantin Plăcintă Valentin Nedeff Mirela Panainte-Lehăduş Elena Puiu Costescu Tudor-Cristian Petrescu Sergiu Stanciu Maricel Agop Diana-Carmen Mirilă Florin Nedeff |
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| description | Experimental and theoretical design on thermal and structural properties of Cu-Zn-Al alloys are established. As such, from an experimental point of view, differential thermal analysis has been performed with the help of a DSC Netzsch STA 449 F1 Jupiter calorimeter with high levels of sensitivity, and the structural analysis has been accomplished through X-ray diffraction and SEM analysis. An unusual specific property for a metallic material has been discovered, which is known as “rubber-type behavior”, a characteristic determined by micro-structural changes. From the theoretical point of view, the thermal transfer in Cu-Zn-Al is presented by assimilating this alloy, both structurally and functionally, with a multifractal, situation in which the order–disorder transitions assimilated with thermal “dynamics” of Cu-Zn-Al, are mimed through transitions from non-multifractal to multifractal curves. In such a context, the thermal expansion velocity contains both the propagation speed of the phase transformation (be it a direct one: austenitic–martensitic transformation, or an indirect one: martensitic–austenitic transformation) and the thermal diffusion speed. Then, through self-modulations of the thermal field, the Cu-Zn-Al alloy will self-structure in channel-type or cellular-type thermal patterns, which can be linked to obtained experimental data. Consequently, since the thermal conductivity becomes a function of the observation scale, and heat transfer is modified to reflect the multifractal, non-differentiable paths in the material, it leads to anomalous diffusion and complex thermal behaviors. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-05-01 |
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| spelling | doaj-art-47714fef289046c4a84a135b76fe5aac2025-08-20T03:27:18ZengMDPI AGEntropy1099-43002025-05-0127658710.3390/e27060587Order–Disorder-Type Transitions Through a Multifractal Procedure in Cu-Zn-Al Alloys—Experimental and Theoretical DesignConstantin Plăcintă0Valentin Nedeff1Mirela Panainte-Lehăduş2Elena Puiu Costescu3Tudor-Cristian Petrescu4Sergiu Stanciu5Maricel Agop6Diana-Carmen Mirilă7Florin Nedeff8Department of Materials Science, Faculty of Material Science and Engineering, “Gheorghe Asachi” Technical University of Iasi, Blvd. Prof. Dr. D. Mangeron, No. 41, 700050 Iași, RomaniaDepartment of Industrial Systems Engineering and Management, Faculty of Engineering, “Vasile Alecsandri” University of Bacau, 157, Calea Marasesti, 600115 Bacau, RomaniaDepartment of Environmental Engineering, Mechanical Engineering and Agritourism, Faculty of Engineering, “Vasile Alecsandri” University of Bacau, 157, Calea Marasesti, 600115 Bacau, RomaniaFaculty of Physics, “Alexandru Ioan Cuza” University of Iasi, Blvd. Carol I, No. 11, 700506 Iași, RomaniaFaculty of Civil Engineering and Building Services, “Gheorghe Asachi” Technical University of Iasi, Blvd. Prof. Dr. D. Mangeron, No. 1, 700050 Iași, RomaniaDepartment of Materials Science, Faculty of Material Science and Engineering, “Gheorghe Asachi” Technical University of Iasi, Blvd. Prof. Dr. D. Mangeron, No. 41, 700050 Iași, RomaniaDepartment of Physics, “Gheorghe Asachi” Technical University of Iasi, Blvd. Prof. Dr. D. Mangeron, No. 59A, 700050 Iași, RomaniaDepartment of Environmental Engineering, Mechanical Engineering and Agritourism, Faculty of Engineering, “Vasile Alecsandri” University of Bacau, 157, Calea Marasesti, 600115 Bacau, RomaniaDepartment of Environmental Engineering, Mechanical Engineering and Agritourism, Faculty of Engineering, “Vasile Alecsandri” University of Bacau, 157, Calea Marasesti, 600115 Bacau, RomaniaExperimental and theoretical design on thermal and structural properties of Cu-Zn-Al alloys are established. As such, from an experimental point of view, differential thermal analysis has been performed with the help of a DSC Netzsch STA 449 F1 Jupiter calorimeter with high levels of sensitivity, and the structural analysis has been accomplished through X-ray diffraction and SEM analysis. An unusual specific property for a metallic material has been discovered, which is known as “rubber-type behavior”, a characteristic determined by micro-structural changes. From the theoretical point of view, the thermal transfer in Cu-Zn-Al is presented by assimilating this alloy, both structurally and functionally, with a multifractal, situation in which the order–disorder transitions assimilated with thermal “dynamics” of Cu-Zn-Al, are mimed through transitions from non-multifractal to multifractal curves. In such a context, the thermal expansion velocity contains both the propagation speed of the phase transformation (be it a direct one: austenitic–martensitic transformation, or an indirect one: martensitic–austenitic transformation) and the thermal diffusion speed. Then, through self-modulations of the thermal field, the Cu-Zn-Al alloy will self-structure in channel-type or cellular-type thermal patterns, which can be linked to obtained experimental data. Consequently, since the thermal conductivity becomes a function of the observation scale, and heat transfer is modified to reflect the multifractal, non-differentiable paths in the material, it leads to anomalous diffusion and complex thermal behaviors.https://www.mdpi.com/1099-4300/27/6/587shape memory alloydifferential scanning calorimetryscanning electron microscopefractalpatternMultifractal Theory of Motion |
| spellingShingle | Constantin Plăcintă Valentin Nedeff Mirela Panainte-Lehăduş Elena Puiu Costescu Tudor-Cristian Petrescu Sergiu Stanciu Maricel Agop Diana-Carmen Mirilă Florin Nedeff Order–Disorder-Type Transitions Through a Multifractal Procedure in Cu-Zn-Al Alloys—Experimental and Theoretical Design Entropy shape memory alloy differential scanning calorimetry scanning electron microscope fractal pattern Multifractal Theory of Motion |
| title | Order–Disorder-Type Transitions Through a Multifractal Procedure in Cu-Zn-Al Alloys—Experimental and Theoretical Design |
| title_full | Order–Disorder-Type Transitions Through a Multifractal Procedure in Cu-Zn-Al Alloys—Experimental and Theoretical Design |
| title_fullStr | Order–Disorder-Type Transitions Through a Multifractal Procedure in Cu-Zn-Al Alloys—Experimental and Theoretical Design |
| title_full_unstemmed | Order–Disorder-Type Transitions Through a Multifractal Procedure in Cu-Zn-Al Alloys—Experimental and Theoretical Design |
| title_short | Order–Disorder-Type Transitions Through a Multifractal Procedure in Cu-Zn-Al Alloys—Experimental and Theoretical Design |
| title_sort | order disorder type transitions through a multifractal procedure in cu zn al alloys experimental and theoretical design |
| topic | shape memory alloy differential scanning calorimetry scanning electron microscope fractal pattern Multifractal Theory of Motion |
| url | https://www.mdpi.com/1099-4300/27/6/587 |
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