High strain rate superplasticity of a Zn–22wt.%Al–xwt.%Ag alloys

Casolco, S.R.; Parra, M. López; Villaseñor, Gabriel Torres

doi:10.1016/j.jmatprotec.2005.02.271

Cited by 13 publications

(9 citation statements)

References 20 publications

(23 reference statements)

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“…This phase corresponds to a stable Agcontaining (AgCu)Zn 4 ¾ Ag phase which inhibits the four-phase reaction and it was reported as the º phase. 16) Thus, the aged ZACA2 alloy has a mixture of both the ¾ and Agcontaining ¾ Ag phases. That is, the ¾ phase reacts with the © phase to form the¸A phase and the Ag-containing ¾ Ag phase remains unchanged which is detected by the presence of XRD peaks corresponding to a cph phase.…”

Section: Xrd Characterization Of Alloysmentioning

confidence: 99%

“…There are several works which have analyzed the effect of addition of silver to the ZnAl and ZnAlCu alloys. 1416) For instance, Casolco et al 15,16) reported that the Ag addition between 4 and 6.15 mass% to the Zn22 mass%Al alloy caused the formation of an intermetallic compound AgZn 3 with a hcp crystalline structure. Additionally, the addition of about 1 Ag mass% to the Zn22 mass%Al alloy has been observed 14) to produce a strong grain refinement of the ¡ and © phases.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ag Addition to Zn22 mass%Al–2 mass%Cu Alloy on the Four-Phase Reaction η + ε → α + τ′

et al. 2018

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The effect of Ag additions to the four-phase, © + ¾ ¼ ¡ +¸A, was studied experimental and thermodynamically using Zn22 mass%Al 2 mass%Cu base alloys with four Ag contents from 0 to about 4 mass% Ag. SEM and XRD results indicated the presence of the¸A phase decreased as the Ag content increased for the aged alloys which can be attributed to the stabilization of the ¾ phase because of its increase in Ag content which is in agreement with Thermo-Calc results. The Ag addition also promoted a slowest decrease in hardness in the aging curves at 200°C which can be attributed to the slowest diffusion process for the quaternary alloy. [

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Section: Xrd Characterization Of Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Ag Addition to Zn22 mass%Al–2 mass%Cu Alloy on the Four-Phase Reaction η + ε → α + τ′

et al. 2018

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“…En el envejecimiento, los picos característicos de la fase ε desaparecen después de 5 horas y aparecen los picos de difracción de la fase τ'. La descomposición de la fase ε y la aparición de la fase τ', ha sido asociado con la reacción de cuatro fases α + ε→η + τ' (Hillert, 1998) y es la responsable de la inestabilidad dimensional de la aleación (Murphy, 1975;Mykura et al, 1986;Zhu, 1999;Casolco et al, 2006). Después de 10 horas a 200 °C se obtienen las fases de equilibrio η, α y τ' (Baker, 1992;Zhu, 2004).…”

Section: Caracterización Mediante Difracción De Rayos Xunclassified

“…Los picos de difracción de rayos X correspondientes a la fase Φ fueron identificados mediante la ficha PDF 51-0642 con una composición (Cu,Ag)Zn 4 . Es decir, la adición de Ag promueve la formación de la fase Φ con una estructura hcp (Casolco et al, 2003;Casolco et al, 2006). La Figura 1b muestra la evolución de los diagramas de difracción de rayos X de la aleación Zn-22%Al-2%Cu-1%Ag.…”

Section: Caracterización Mediante Difracción De Rayos Xunclassified

“…Se ha publicado que para las composiciones de 4,24% y 6,15% en Ag, se forma el intermetálico AgZn 3 y en aleaciones con contenidos de 1% en Ag se obtiene un refinamiento de grano de alrededor del 50% con respecto a los granos de la aleación Zn-22%Al. Se ha concluido que con la adición de plata es posible obtener altos niveles de deformación (Zhu, 1999;Dorantes Rosales, 2000;Casolco et al, 2003;Casolco et al, 2006).…”

Section: Introductionunclassified

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Transformaciones de fase en aleaciones Zn-22%Al-2%Cu y Zn-22%Al-2%Cu-X (X = 1, 2 y 3%Ag) envejecidas isotérmicamente

Flores-Ramos¹,

Dorantes-Rosales²,

López-Hirata³

et al. 2014

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RESUMEN:En el presente estudio sobre las transformaciones de fase en las aleaciones Zn-22%Al-2%Cu y Zn-22%Al-2%Cu-X (X = 1, 2 y 3%Ag) se utilizó Difracción de Rayos X (DRX) y Microscopía Electrónica de Barrido (MEB). Las aleaciones fueron homogeneizadas a 350 °C durante 10 días, templadas a ~2 °C y posteriormente envejecidas a 200 °C durante diferentes tiempos. Todas las aleaciones ensayadas presentaron una microestructura inicial formada por una matriz de granos finos y equiaxiales de las fases α y η. Además, para las aleaciones sin Ag se observa la presencia de partículas de la fase ε (CuZn 4 ) y de Φ ((Ag, Cu) Zn 4 ) en las que se adicionó Ag. Durante el envejecido, ocurre la reacción de cuatro fases, α + ε→η + τ', para obtener las fases de equilibrio η, α y τ'. Sin embargo, la adición de Ag promueve la formación de la fase Φ, la cual retarda e incluso inhibe la reacción de cuatro fases. La estabilidad de la fase Φ se obtiene con 3%Ag, lo que podría mejorar la estabilidad dimensional de la aleación para futuras aplicaciones industriales. 2 and 3%Ag) alloys during aging treatments. The study of phase transformations that take place in Zn-22%Al-2%Cu and Zn-22%Al-2%Cu-X (X = 1, 2 and 3%Ag) alloys was carried out using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Alloys were homogenized at 350 °C during 10 days and quenched at ~2 °C. Subsequently, samples were aged at 200 °C for different times. The initial microstructure consists in a matrix of fine equiaxial grains of α and η phases for all the alloys. Besides isolated particles of ε and Φ were observed without and with Ag addition, respectively. During the aging, the four phase reaction, α + ε→η + τ', takes place to obtain the equilibrium η, α and τ' phases. However, the Ag addition promotes the formation of the Φ phase, which retards or inhibits the four phase reaction. The stability of the Φ phase is obtained with 3%Ag, which could improve the dimensional stability of the alloy for future industrial applications. ABSTRACT: Phase transformations in

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Microstructural and Mechanical Performance of Cold‐Rolled Al Base Alloys

Casolco

Valdez

2011

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High strain rate superplasticity of a Zn–22wt.%Al–xwt.%Ag alloys

Cited by 13 publications

References 20 publications

Effect of Ag Addition to Zn22 mass%Al–2 mass%Cu Alloy on the Four-Phase Reaction η + ε → α + τ′

Effect of Ag Addition to Zn22 mass%Al–2 mass%Cu Alloy on the Four-Phase Reaction η + ε → α + τ′

Transformaciones de fase en aleaciones Zn-22%Al-2%Cu y Zn-22%Al-2%Cu-X (X = 1, 2 y 3%Ag) envejecidas isotérmicamente

Microstructural and Mechanical Performance of Cold‐Rolled Al Base Alloys

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