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In-Situ Investigation of Hot Tearing in Aluminum Alloy AA1050 via Acoustic Emission and Cooling Curve Analysis

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Abstract

Hot tearing in the AA1050 alloy was investigated in real time and in situ using acoustic emission (AE) and cooling curve analysis techniques and a ring mold. Activities involving AE have been detected in three zones of the solidification curve. The characteristic signals for hot tearing were an AE energy of over 600 e.u. and an average frequency of ~125 ± 15 kHz in zone II. For hot cracking, the AE energy was over 650 e.u. and the average frequency was ~128 ± 17 kHz in zone III. The hot-tear start temperature ranged from 636 °C to 653 °C; the nonequilibrium solidus T′ S , from 556 °C to 614 °C; the fraction solid at hot-tear onset from 0.71 to 0.99; and the Clyne–Davis hot-tear susceptibility coefficient (HSC) from 0.25 to 0.81. The HSC correlated inversely with a total energy of solidification cracking (E total) \( {\text{HSC}} \cong 167\left( {E_{\text{total}} } \right)^{ - 0.8}. \) A hot-tear susceptibility factor (HSF) = (pct Fe)·(cooling rate (CR))2 was related to the HSC and T′ S as HSC = 0.002 HSF + 0.3 and T′ S  = −0.3 HSF + 617.

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Acknowledgments

The authors express their sincere gratitude to the Natural Sciences and Engineering Research Council of Canada, Alcan International, Ltd. (currently Rio Tinto Alcan), and the Foundation of the University of Quebec in Chicoutimi (grant no. 269701/410) for providing financial support. H. Tremblay and S. Lessard are gratefully acknowledged for developing the AE probe/wave guard and conducting the initial experiments.

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Authors and Affiliations

  1. McGill University, Montreal, PQ, Canada, H3A 2B2

    M.O. Pekguleryuz (Professor)

  2. Vant Technology, Inc., Coquitlam, BC, Canada, V3E 2T8

    X. Li (Vice President)

  3. Center for Research in Computational Thermochemistry, Ecole Polytechnique, Montreal, PQ, Canada, H3C 3A7

    C.A. Aliravci (Research Associate)

Authors
  1. M.O. Pekguleryuz
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  2. X. Li
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  3. C.A. Aliravci
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Corresponding author

Correspondence to M.O. Pekguleryuz.

Additional information

Manuscript submitted April 16, 2008.

Appendix

Appendix

Appendix Summary of AE Test Results
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Pekguleryuz, M., Li, X. & Aliravci, C. In-Situ Investigation of Hot Tearing in Aluminum Alloy AA1050 via Acoustic Emission and Cooling Curve Analysis. Metall Mater Trans A 40, 1436–1456 (2009). https://doi.org/10.1007/s11661-009-9806-4

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