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Precipitation Sequence in Mg-Zn-Sn Based Alloys

Published online by Cambridge University Press:  26 February 2011

Anton Gorny ,
Alexander Katsman ,
Dmitry Shepelev  and
Menahem Bamberger
Anton Gorny
Affiliation:
tony911@tx.technion.ac.ilTechnion IITDepartment of Materials EngineeringTechnion CityHaifa 32000, Israel
Alexander Katsman
Affiliation:
akatsman@tx.technion.ac.il, Technion IIT, Department of Materials Engineering, Technion City, Ha ifa, 32000, Israel
Dmitry Shepelev
Affiliation:
dshepelev@tx.technion.ac.il, Technion IIT, Department of Materials Engineering, Technion City, Haifa, 32000, Israel
Menahem Bamberger
Affiliation:
mtrbam@tx.technion.ac.il, Technion IIT, Department of Materials Engineering, Technion City, Haifa, 32000, Israel
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Abstract

Extensive experimental research work has been carried out in order to develop an Mg-Zn-Sn based creep resistant alloy. It was found that the addition of Y improves the structural stability of this alloy. The main goal of this work was to investigate precipitation sequence in Mg-Zn-Sn-Y alloys during aging at different temperatures. In order to elucidate the sequence of phase formation, XRD, TEM, SEM and EDS analyses were applied. It was found that, firstly, an hcp-MgZn2 phase nucleates homogeneously, and grows in the form of needles having coherent interphase boundaries with Mg-matrix. High-resolution TEM images in combination with Fourier transformed images reveal a topotaxial orientation relationship which is given by {110}MgZn2 <100>MgZn2∥(002)α-Mg<110>α-Mg. The cubic fcc Mg2Sn-phase nucleates heterogeneously, mainly at the tips of MgZn2-needles when the needle's width reaches a certain critical value. The orientation of Mg2Sn-precipitates is usually perpendicular to the one of MgZn2-needles. Two-phase T-like particles are very typical of alloys aged for 1-16 days at 175-225C. The width/length ratio of MgZn2-needles inside T-like particles differs substantially from the one found in single needles. The elastic/surface energy balance of needles and its influence on the morphology and coarsening behaviour has been analyzed.

Keywords

phase transformationMgnucleation & growth
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 979: Symposium HH – Thermodynamics and Kinetics of Phase Transformations in Inorganic Materials , 2006 , 0979-HH11-18
Copyright
Copyright © Materials Research Society 2007

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References

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