Influence of quenched-in vacancies on the elastic modulus and its dependence on the temperature in β CuAlBe shape memory alloys

The influence of quenched-in vacancies on the elastic modulus and its dependence on the temperature was studied in a β CuAlBe polycrystalline shape memory alloy. Samples with different quenching temperatures were submitted to different heat treatments and the behavior of the elastic modulus, phase t...

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Bibliographic Details
Published in:Intermetallics 2019-08, Vol.111, p.106485, Article 106485
Main Authors: Tognana, S., Montecinos, S., Salgueiro, W.
Format: Article
Language:English
Subjects:
A. shape–memory alloys
B. elastic properties
Beta phase
C. heat treatment
D. microstructure
Heat treating
Heat treatment
Martensite
Martensitic transformation
Martensitic transformations
Modulus of elasticity
Phase transitions
Quenching
Shape memory alloys
Temperature
Temperature dependence
Thermal properties
Vacancies
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Summary:The influence of quenched-in vacancies on the elastic modulus and its dependence on the temperature was studied in a β CuAlBe polycrystalline shape memory alloy. Samples with different quenching temperatures were submitted to different heat treatments and the behavior of the elastic modulus, phase transformation and microstructure with the temperature was carefully analyzed to understand the processes that occur in each stage. The quenched-in vacancies retained in β phase migrate during a heating from room temperature up to 200 °C and the modulus exhibits a two stage behavior, associated with the higher mobility of the quenched-in vacancies at higher temperatures. However, those present in martensite phase would not be eliminated during the first heating or subsequent heating cycles at 200 °C or 300 °C. Part of these vacancies would also produce the hyperstabilization of some amount of martensite phase. •The behavior of quenched-in vacancies with temperature in a CuAlBe alloy was studied.•Vacancies influence the elastic module, martensitic transformation and microstructure.•The modulus exhibits a two stage behavior due to the higher mobility of vacancies.•Vacancies retained in β phase migrate during heating, not so those in martensite.•Those present in martensite produce their stabilization and hyperstabilization.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2019.106485