Zn-22Al-2Cu alloy phase transformations at different homogenizing temperatures

Héctor Javier Dorantes-Rosales, Víctor Manuel López-Hirata, Ramón Esquivel-González, Jorge Luis González-Velazquez, Joel Moreno-Palmerin, Antonio Torres-Castillo

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The effect of the homogenizing temperature on phase transformations and hardening behavior was studied in a Zn-22Al-2Cu (wt%) alloy homogenized for 7 days at 315, 350, and 390 °C. The homogenized alloy was subsequently quenched and aged naturally at room temperature or artificially at 200 °C for different time periods. The β phase was unstable at room temperature and it decomposed through the β → α + η reaction during natural aging. An increase in the homogenizing temperature caused a decrease in the kinetics of the decomposition of the β phase in the alloy. Natural aging also caused an increase in the hardness due to the formation of nanometric grains with α and η phases and the presence of an intermetallic e phase. This result agrees with the time exponents (n) between 1.5 and 2.6, which were obtained using the Johnson-Mehl-Avrami-Kolmogorov equation for the decomposition of the β phase. The transformed fraction curves exhibited the fastest and slowest growth kinetics of the â phase decomposition at homogenizing temperatures of 350 and 390 °C, respectively. The artificial aging induced the formation of equilibrium phases and began a decrease in hardness due to the coarsening process of the equilibrium α, η, and τ' phases. © KIM and Springer.
Original languageAmerican English
Pages (from-to)385-390
Number of pages345
JournalMetals and Materials International
DOIs
StatePublished - 1 Jun 2012

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homogenizing
phase transformations
Phase transitions
decomposition
hardness
Aging of materials
Decomposition
kinetics
room temperature
hardening
Temperature
Hardness
temperature
intermetallics
exponents
Growth kinetics
Coarsening
Phase equilibria
Intermetallics
curves

Cite this

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title = "Zn-22Al-2Cu alloy phase transformations at different homogenizing temperatures",
abstract = "The effect of the homogenizing temperature on phase transformations and hardening behavior was studied in a Zn-22Al-2Cu (wt{\%}) alloy homogenized for 7 days at 315, 350, and 390 °C. The homogenized alloy was subsequently quenched and aged naturally at room temperature or artificially at 200 °C for different time periods. The β phase was unstable at room temperature and it decomposed through the β → α + η reaction during natural aging. An increase in the homogenizing temperature caused a decrease in the kinetics of the decomposition of the β phase in the alloy. Natural aging also caused an increase in the hardness due to the formation of nanometric grains with α and η phases and the presence of an intermetallic e phase. This result agrees with the time exponents (n) between 1.5 and 2.6, which were obtained using the Johnson-Mehl-Avrami-Kolmogorov equation for the decomposition of the β phase. The transformed fraction curves exhibited the fastest and slowest growth kinetics of the {\^a} phase decomposition at homogenizing temperatures of 350 and 390 °C, respectively. The artificial aging induced the formation of equilibrium phases and began a decrease in hardness due to the coarsening process of the equilibrium α, η, and τ' phases. {\circledC} KIM and Springer.",
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Zn-22Al-2Cu alloy phase transformations at different homogenizing temperatures. / Dorantes-Rosales, Héctor Javier; López-Hirata, Víctor Manuel; Esquivel-González, Ramón; González-Velazquez, Jorge Luis; Moreno-Palmerin, Joel; Torres-Castillo, Antonio.

In: Metals and Materials International, 01.06.2012, p. 385-390.

Research output: Contribution to journalArticle

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AU - Dorantes-Rosales, Héctor Javier

AU - López-Hirata, Víctor Manuel

AU - Esquivel-González, Ramón

AU - González-Velazquez, Jorge Luis

AU - Moreno-Palmerin, Joel

AU - Torres-Castillo, Antonio

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