Journal
INTERNATIONAL JOURNAL OF CAST METALS RESEARCH
Volume 33, Issue 4-5, Pages 157-164Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13640461.2020.1801561
Keywords
Strain induced melt activation (SIMA); thixoforming; solidification; semisolid metal processing
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The concept of converting dendritic structures into globular morphologies through solid-state deformation, termed as strain-induced melt activation (SIMA), is assessed. Although the original invention defined the specific two-stage deformation scenario, almost four decades of extensive research, involving a variety of ferrous and non-ferrous alloys, subjected to conventional and severe plastic deformations, caused its evolution. According to present understanding, any deformation of cast structures with a strain level sufficient to trigger recrystallisation leads to dendrite-to-globule transition during subsequent partial melting. It is proposed that the SIMA term should not only be associated with the particular deformation scenario but should be seen as a broad synonym for a variety of thermomechanical treatments, explored for controlling the solidification microstructure. Such an updated definition expands applicability of the SIMA concept from bulk billets to coarse particulates and fine powders.
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