Next Article in Journal
Effect of Residual Stress on Hydrogen Diffusion in Thick Butt-Welded High-Strength Steel Plates
Previous Article in Journal
Preferential Locations of Hydrogen Accumulation and Damage in 1.2 GPa and 1.8 GPa Grade Hot-Stamped Steels: A Comparative Study
Previous Article in Special Issue
Assessing Microstructure Tensile Properties Relationships in Al-7Si-Mg Alloys via Multiple Regression
Article

Hypereutectic Zn–Al Alloys: Microstructural Development under Unsteady-State Solidification Conditions, Eutectic Coupled Zone and Hardness

1
Institute of Geosciences and Engineering, Federal University of the South and Southeast of Pará, Unifesspa, Marabá 68050-080, PA, Brazil
2
Department of Manufacturing and Materials Engineering, University of Campinas, Unicamp, Campinas 13083-860, SP, Brazil
3
Federal Institute of Education, Science and Technology of Pará–IFPA, Belém 66093-020, PA, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Roberto Montanari
Metals 2022, 12(7), 1076; https://doi.org/10.3390/met12071076
Received: 31 May 2022 / Revised: 19 June 2022 / Accepted: 20 June 2022 / Published: 23 June 2022
The present study investigates the effects of Al content and solidification thermal parameters on the microstructural development under transient heat flow conditions for two hypereutectic Zn–Al alloys: Zn-6wt.%Al and Zn-11wt.%Al. The alloys were directionally solidified and had experimental cooling profiles monitored permitting cooling rates and growth rates to be determined along the length of the directionally solidified (DS) castings. The microstructure of the Zn-6wt.%Al alloy is shown to be formed by eutectic colonies, constituted by a eutectic mixture of (Zn) and (Al′) phases in the form of lamellae and the Zn-11wt.% Al alloy by the pro-eutectic (Al′) dendrites and the eutectic mixture in the interdendritic regions. Growth laws are experimentally determined relating eutectic and dendritic spacings to the growth rate and cooling rate. A diagram exhibiting the coupled zone of Zn–Al alloys as a function of cooling rate is proposed, which shows different microstructural morphologies influenced by composition and thermal parameters, that is, growth rate and the temperature gradient, synthesized by the cooling rate (Ṫ = G.V). The microhardness of both Zn-6wt.%Al and Zn-11wt.%Al alloys were shown not to depend on the length scale of the resulting microstructure. View Full-Text
Keywords: Zn–Al alloys; solidification; microstructure; hardness Zn–Al alloys; solidification; microstructure; hardness
Show Figures

Figure 1

MDPI and ACS Style

Septimio, R.; Silva, C.A.P.; Costa, T.A.; Garcia, A.; Cheung, N. Hypereutectic Zn–Al Alloys: Microstructural Development under Unsteady-State Solidification Conditions, Eutectic Coupled Zone and Hardness. Metals 2022, 12, 1076. https://doi.org/10.3390/met12071076

AMA Style

Septimio R, Silva CAP, Costa TA, Garcia A, Cheung N. Hypereutectic Zn–Al Alloys: Microstructural Development under Unsteady-State Solidification Conditions, Eutectic Coupled Zone and Hardness. Metals. 2022; 12(7):1076. https://doi.org/10.3390/met12071076

Chicago/Turabian Style

Septimio, Rudimylla, Cássio A.P. Silva, Thiago A. Costa, Amauri Garcia, and Noé Cheung. 2022. "Hypereutectic Zn–Al Alloys: Microstructural Development under Unsteady-State Solidification Conditions, Eutectic Coupled Zone and Hardness" Metals 12, no. 7: 1076. https://doi.org/10.3390/met12071076

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop