Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-25T15:39:49.438Z Has data issue: false hasContentIssue false

Precipitation Sequence in Mg-Zn-Sn Based Alloys

Published online by Cambridge University Press:  26 February 2011

Anton Gorny
Affiliation:
[email protected] IITDepartment of Materials EngineeringTechnion CityHaifa 32000, Israel
Alexander Katsman
Affiliation:
[email protected], Technion IIT, Department of Materials Engineering, Technion City, Ha ifa, 32000, Israel
Dmitry Shepelev
Affiliation:
[email protected], Technion IIT, Department of Materials Engineering, Technion City, Haifa, 32000, Israel
Menahem Bamberger
Affiliation:
[email protected], Technion IIT, Department of Materials Engineering, Technion City, Haifa, 32000, Israel
Get access

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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Cohen, S., Goren-Muginstein, G.R., Abraham, S., Dehm, G. and Bamberger, M., Mg Technology – TMS annual meeting, San Diego, CA, USA (2003) 2–6 March, pp. 301305.Google Scholar
2. Katsman, A., Cohen, S., Goren-Muginstein, G.R. and Bamberger, M., Mg.Technology – TMS annual meeting, Charlotte, USA (2003) 14–18 March, pp.297300.Google Scholar
3. Cohen, S., Goren-Muginstein, G.R., Abraham, S., Rashkova, B., Dehm, G. and Bamberger, M., Metallkd, Z.. 96, 9 (2005).Google Scholar
4. Rashkova, , Goren-Muginstein, G.R., Bamberger, M., Dehm, G., 7th Multinational Congress on Microscopy, Portoroz, Slovenia (2005) pp.183184.Google Scholar
5. Sasaki, T.T., Oh-ishi, K., Ohkubo, T. and Hono, K., Scripta Mater., 55, 251 (2006)Google Scholar
6. Mendis, C.L., Bettles, C.J., Gibson, M.A., Hatchinson, C.R., Mater.Sci.Eng.,A435–436,163 (2006)Google Scholar
7. Gorny, A., Goren-Muginstein, G.R., Katsman, A., Dehm, G., Rashkova, B. and Bamberger, M., Mg.Technology – TMS annual meeting, San Antonio, USA, 12–16 March (2006), pp.387392.Google Scholar
8. Katsman, A., Cohen, S. and Bamberger, M., Mater.Sci. Eng, (2006), to be published.Google Scholar
9. Eshelby, J.D., Proc.R.Soc. A241, 376 (1957).Google Scholar
10. Aaronson, H.I, Kinsman, K.R., Rassel, K.C., Scripta Metal., 4, 101 (1970).Google Scholar
11. Rashkova, B., Görgl, R., Prantl, W., Keckes, J., Cohen, S., Bamberger, M., and Dehm, G., Precipitation Processes in a Mg-Zn-Sn Alloy studied by TEM and SAXS, to be published.Google Scholar