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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Microstructure characterization of a directionally solidified Mg-12wt.%Zn alloy: Equiaxed dendrites, eutectic mixture and type/morphology of intermetallics

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Author(s):
Verissimo, Nathalia C. [1, 2] ; Brito, Crystopher [3] ; Afonso, Conrado R. [4] ; Spinelli, Jose E. [4] ; Cheung, Noe [1] ; Garcia, Amauri [1]
Total Authors: 6
Affiliation:
[1] Univ Estadual Campinas, UNICAMP, Dept Mfg & Mat Engn, BR-13083860 Campinas, SP - Brazil
[2] Univ Santa Cecilia, UNISANTA, Postgrad Program Mech Engn, Dept Mech Engn, BR-11045907 Santos - Brazil
[3] Univ Fed Sao Paulo, UNIFESP, Marine Inst, BR-11030400 Santos, SP - Brazil
[4] Univ Fed Sao Carlos, UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Materials Chemistry and Physics; v. 204, p. 105-131, JAN 15 2018.
Web of Science Citations: 3
Abstract

Over the last years, magnesium and its alloys have deserved special attention due to their good mechanical properties and promising biomedical applications. In the present investigation the Mg-12 wt.% Zn alloy has been directionally solidified (DS) under an extensive range of cooling rates. Based on the scarceness of characterization works related to both the morphology of the eutectic mixture and the development of equilibrium and non-equilibrium intermetallic particles (IMCs) in Mg-Zn alloys, a number of analyses are performed emphasizing and discussing such aspects. Rod and lamellar eutectic spacings are experimentally correlated with the growth rate and the cooling rate. The volume fraction of rod-like eutectic is shown to increase with the decrease in cooling rate during solidification. The characterization on the DS Mg-12 wt.%Zn samples is carried out using X-ray diffraction (XRD), scanning (SEM) and transmission (TEM) electron microscopies, which allowed the identification of two different non equilibrium IMCs, MgZn2 and Mg4Zn7, which are distributed as nanoparticles throughout the alpha-Mg matrix. The Mg-Zn eutectic morphologies (lamellar and rod-like) are found to be constituted by alpha-Mg/Mg21Zn25 phases, the latter being formed by the decomposition of the eutectic IMC Mg51Zn20 through a eutectoid reaction. (C) 2017 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 14/50502-5 - Interrelation of thermal and microstructural solidification parameters and corrosion/tribocorrosion behavior of alloys for tribological, biomedical and solder applications
Grantee:Amauri Garcia
Support Opportunities: Regular Research Grants