Effects of Ceramic Inoculants and Intermetallic Phases on Hot Rolled AZ Magnesium Wrought Alloys

Abstract:

The role of ceramic particles, calcium and rare earth elements on magnesium alloys during solidification from the melt and after hot rolling has been studied by microstructural investigations, texture measurements and mechanical tests. Different ceramic inoculants like silicon carbide or zirconium diboride and two different rare earth elements (cerium and lanthanum) forming intermetallic compounds were used. Both, ceramic particles and intermetallic phases, modify the texture evolution during hot forming. The rolled alloys exhibited a basal fibre texture which is weakened by ceramic particles and intermetallic phases respectively. This weakening of the basal texture is capable of lowering the anisotropy of the yield stress and improving the formability of sheet material. Influences of the alloying contents on microstructure, texture evolution and mechanical properties will be discussed.

• Periodical: Materials Science Forum (Volume 690)
• Pages: 306-310
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.690.306
• Online since: June 2011
• Authors: Urs Haßlinger, Christian Hartig, Robert Günther, Dietmar Letzig, Karl Ulrich Kainer, Rüdiger Bormann
• Keywords: Hot Rolling, Magnesium AZ Wrought Alloy, Particle, Texture

References

[1] P. Juchmann et al., Magnesium sheet parts for automotive applications - Material and process chain, in Innovative Developments for Lightweight Vehicle Structures, 2009, VW: Wolfsburg, Germany. pp.141-156

[2] E. Hombergsmeier, AEROMAG-Aeronautic Application of Wrought Magnesium, in Proceedings of the 8th International Conference on Magnesium Alloys and Their Applications, Weimar, Wiley-VCH (2009), pp.1383-1391

[3] R. Günther, C. Hartig, N. Hort, R. Bormann, On the influence of settling of (ZrB2)P inoculants on Grain Refinement of Mg-alloys: Experiment and Theoretical Calculation in E.A. Nyberg, S.R. Agnew, N.R. Neelameggham, M.O. Pekguleryuz, editors. Magnesium Technology 2009. San Francisco, CA: TMS, 2009. pp.309-313

[4] A. Suzuki, N.D. Saddock et al., Solidification paths and eutectic intermetallic phases in Mg-Al-Ca ternary alloys, Acta Materialia 53 (2005), pp.2823-2834

DOI: 10.1016/j.actamat.2005.03.001

[5] U. Haßlinger, L. Fuskova et al., Effects of Ceramic Inoculants and Rare Earth Phases on Microstructure and Related Mechanical Properties of Magnesium Alloys, in Proceedings of the 8th International Conference on Magnesium Alloys and Their Applications, Weimar, Wiley-VCH (2009), pp.1260-1267

[6] T. Laser, M. R. Nürnberg et al., The Influence of Calcium and Cerium Mischmetal on the Deformation Behavior of Mg-3Al-1Zn, in Proceedings of the 7th International Conference on Magnesium Alloys and Their Applications, Dresden, Wiley-VCH (2006), pp.1055-1061

[7] H.-J. Bunge, Texture analysis in materials science: mathematical methods, Cuvillier, Göttingen, (1993)

[8] Y. C. Lee, A.K. Dahle and D.H. StJohn, The role of solute in grain refinement of magnesium, Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 2000, 31(11), pp.2895-2906

DOI: 10.1007/bf02830349

[9] E. A. Ball. and P. B. Prangnell, Tensile-Compressive Yield Asymmetries in High-Strength Wrought Magnesium Alloys, Scripta Metallurgica et Materialia 31(2) (1994), pp.111-116

DOI: 10.1016/0956-716x(94)90159-7