The influence of ageing on the reversible martensitic transformation in CuZnAl alloys
| Autor: | J. Rasek, J. Ilczuk, H. Morawiec, B. Kostrubiec |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Alloy Metals and Alloys Thermodynamics Activation energy engineering.material Isothermal process Reaction rate Mechanics of Materials Electrical resistivity and conductivity Diffusionless transformation Martensite Materials Chemistry engineering Crystallite |
| Zdroj: | Journal of Alloys and Compounds. :201-203 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/0925-8388(94)90482-0 |
| Popis: | The methods of internal friction and electrical resistivity were applied to study the influence of the ageing process of the martensite in two polycrystalline CuZnAl alloys on the course and variations of the reversible martensitic transformation. From the analysis of curves of Q −1 f ( T ) and the use of the chemical reaction rate equation, the activation energy for the initial stage of the martensite stabilization process E =(0.73±0.01) eV was determined; it corresponds to the disappearance of vacancies (alloy I). Based on the analysis of isochronal and isothermal curves of electrical resistivity, two processes (A and B) were distinguished (alloy II). Process A, with activation energy E A M = (0.69±0.02) eV, corresponds to the disappearance of divacancies, whereas process B, with activation energy E B M = (0.84±0.02) eV, corresponds to the disappearance of monovacancies. |
| Databáze: | OpenAIRE |
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