Abstract
ALEMI is concerned with the interactions between Alloying Elements and Migrating Interfaces. A first meeting was held in conjunction with the 2000 TMS Fall Meeting in St. Louis, MO. About 22 attendees endorsed the principles contained in the invitation, which envisaged a more collaborative approach to the study of alloying element interactions with transformation interfaces, especially in alloy steels. The meetings were intended to be informal workshops emphasizing the sharing of ideas and plans for research. The development of a shared stock of alloys for research was planned, as well as the publication of summaries of discussions in an open, preferably archival, forum. Eight further meetings were held, often in conjunction with major conferences. An approximate equilibrium developed between discussions of theoretical matters and experimental results and methods. A remarkable number of those who attended the first meeting in St. Louis continued to participate. Research ideas were put forward, issues debated, collaborations fostered, and the science of transformation interfaces advanced.
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Notes
Unless otherwise stated, all alloy compositions are given in mass percent.
Hillert et al.[22] pointed out that the PB[26] model is based upon Cahn’s model,[23] which is strictly applicable to solute drag of grain boundaries in a single-phase alloy. The PB model yields a nonzero drag force at zero boundary velocity if the integration is not extended over the diffusion spike in the matrix phase. The amount of error depends on the difference in the standard free energy of solute between ferrite and austenite relative to the binding energy to the α/γ boundary.
The mobilities that had to be used in these simulations to match experimental kinetics were found to be unrealistic; i.e., the pre-exponential had to be a function of temperature when assuming an effective activation energy of 140 kJ/mol. This may further indicate a solute drag role of Mn.
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Purdy, G., Ågren, J., Borgenstam, A. et al. ALEMI: A Ten-Year History of Discussions of Alloying-Element Interactions with Migrating Interfaces. Metall Mater Trans A 42, 3703–3718 (2011). https://doi.org/10.1007/s11661-011-0766-0
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DOI: https://doi.org/10.1007/s11661-011-0766-0