Influence of Ag additions on the activation energy for the reverse eutectoid reaction in Cu–Al alloys

Carvalho, T.M.; Adorno, A. T.; Magdalena, Aroldo Geraldo; Silva, R.A.G.

doi:10.1007/s10973-010-1210-1

Cited by 6 publications

(1 citation statement)

References 7 publications

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“…On the other hand, Fig. 3(b) portrays the appearance of small Ag-rich precipitates [22] highlighted as light-colored globules. The quenching and tempering heat treatments show clearly that the whitish silver precipitates have elongated slightly at random places of the microstructure.…”

Section: Microstructurementioning

confidence: 99%

Effect of the Tempering Heat Treatment on the Cu-Based Shape Memory Alloy Exposed to a Commonly used Corrosive Medium

Flores-Sanchez,

Suárez-Rosales,

Landa-Castro

et al. 2023

J. Mex. Chem. Soc.

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Abstract. In the present work, the corrosion behavior of the as-cast Cu-9Al-3Ag alloy, with shape memory, SMA, and with tempering heat treatments at two temperatures, 400 and 600 °C, were studied. These treatments were selected due to the austenite-martensite phase transition or vice versa. For this investigation, a 0.5 M NaCl electrolyte was used. Micrographs using optical microscopy and scanning electron microscopy show the martensite phase in the Cu-9Al-3Ag alloy, likewise, in the tempered samples the austenite-martensite phases were also observed. For the evaluation of the corrosion behavior, the Tafel model was implemented, for whose curves a potential of ±200 mV was used from the Ecorr. It was observed that the sample with SMA presented a good resistance to corrosion, as well as the tempered samples, unlike the as-cast sample. Finally, impedance tests were carried out using a frequency range of 100 kHz to 10 mHz and an amplitude of 10 mV, in order to observe the resistances to the solution and to the charge transfer present in each one of the samples used. Resumen. En el presente trabajo se estudió el comportamiento de corrosión en la aleación Cu-9Al-3Ag en estado de colada, con memoria de forma en conjunto con tratamientos térmicos de revenido a temperaturas de 400 y 600 °C. Dichos tratamientos fueron seleccionados debido al cambio de transición de fase austenita-martensita o viceversa. Para esta investigación se utilizó un electrolito a 0.5 M NaCl. Las micrografías mediante microscopia óptica y microscopia electrónica de barrido muestran la fase martensita en la aleación Cu-9Al-3Ag, así mismo, en las muestras revenidas se puede observar las fases austenita-martensita. Para la evaluación del comportamiento de corrosión se implementaron las curvas de Tafel, en las cuales se utilizó un potencial de ±200 mV a partir del Ecorr. Se observó que la muestra con SMA presento una buena resistencia a la corrosión al igual que las muestras revenidas a diferencia de la muestra en estado de colada. Por último, se realizaron pruebas de impedancia utilizando un rango de frecuencia de 100 kHz a 10 mHz y una amplitud de 10 mV, con la finalidad de observar las resistencias a la solución y a la transferencia de carga presentes en cada una de las muestras utilizadas.

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Section: Microstructurementioning

confidence: 99%