Effect of thermomechanical processing on grain structure development in a twin-belt strip cast automotive aluminum alloy
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might not play a role during plastic deformation of bulk cryomilled Al-7.5 pct Mg alloys. The work is supported by the Office of Naval Research under Grant Nos. N00014-01-1-0882 and N00014-03-1-0149, with Dr. Lawrence Kabacoff as program officer. REFERENCES 1. S.L. Semiatin, K.V. Jata, M.D. Uchic, P.B. Berbon, D.E. Matejezyk, and C.C. Bampton: Scripta Mater., 2001, vol. 44, pp. 395-400. 2. R.W. Hayes, R. Rodriguez, and E.J. Lavernia: Acta Mater., 2001, vol. 49, pp. 4055-68. 3. V.L. Tellkamp, A. Melmed, and E.J. Lavernia: Metall. Mater. Trans. A, 2001, vol. 32A, pp. 2335-43. 4. B.Q. Han, Z. Lee, S.R. Nutt, E.J. Lavernia, and F.A. Mohamed: Metall. Mater. Trans. A, 2003, vol. 34A, pp. 603-13. 5. J.W. Christian and S. Mahajan: Progs. Mater. Sci., 1995, vol. 39, pp. 1-157. 6. J. He, K.H. Chung, X. Liao, Y.T. Zhu, and E.J. Lavernia: Metall. Mater. Trans. A, 2003, vol. 34A, pp. 707-12. 7. F. Zhou, X.Z. Liao, Y.T. Zhu, S. Dallek, and E.J. Lavernia: Acta Mater., 2003, vol. 51, pp. 2777-91. 8. B.D. Cullity: Elements of X-ray Diffraction, Addison-Wesley Publishing Co., Inc., Reading, MA, 1978. 9. H.L. Luo, C.C. Chao, and P. Duwez: Trans. TMS-AIME, 1964, vol. 230, pp. 1488-90. 10. F. Zhou, R. Rodriguez, and E.J. Lavernia: Mater. Sci. Forum, 2002, vols. 386–388, pp. 409-14.
Effect of Thermomechanical Processing on Grain Structure Development in a Twin-Belt Strip Cast Automotive Aluminum Alloy S.X. GIRARD, H.N. AZARI, and D.S. WILKINSON The effect of iron content and thermomechanical processing on microstructural evolution observed in a strip-cast AA5754 aluminum alloy has been investigated. The as-cast alloy exhibits an equiaxed structure with clusters of Fe-rich intermetallic particles and centerline porosity. The thermomechanical processing schedule consisted of cold or warm rolling, intermediate annealing, cold rolling, and final annealing. Increased iron content was observed to lead to a finer grain structure and primary warm rolling induced a coarser and less homogeneous grain structure. The level of secondary rolling is a key parameter for grain size control, with an increase in final cold work resulting in a finer and more homogeneous grain structure. Aluminum alloys have received increasing attention by the automotive industry in the development of fuel-efficient vehicles. In North America, the AA5754 alloy is generally considered for structural applications.[1] One issue in introducing Al alloys in automotive production is cost, related in part to
S.X. GIRARD, formerly a graduate student with the Department of Materials Science and Engineering, McMaster University, is Product Development Engineer, Honda of Canada Mfg., Alliston, ON, Canada L9R 1A2. H.N. AZARI, Research Associate, and D.S. WILKINSON, Professor, are with the Department of Materials Science and Engineering, McMaster University, Hamilton, ON, Canada L8S 4L7. Contact e-mail: [email protected] Manuscript submitted April 9, 2003.
METALLURGICAL AND MATERIALS TRANSACTIONS A
the conversion of liquid metal into thin gage sheet.[2
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