Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
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DOI:
10.7502/j.issn.1674-3962.2015.04.04
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Abstract:
In this paper we review integrated CAPHAD and phase field modeling with critical experiments to explore a newly discovered, non-conventional, solid-solid phase transformation pathway based on the so-called pseudo-spinodal mechanism. This mechanism was first proposed by Ni and Khachaturyan to explain the chessboard structure and then was used by Fraser et al to explain the formation of refined alpha microstructure in Ti-alloys. We show that this new transformation pathway offers a new design strategy for Ti alloys to obtain extremely fine and uniform?????microstructures that could potentially have highly attractive balances of mechanical properties. To broaden the processing window for such a mechanism to operate, a different non-conventional transformation pathway that involves precursory phase separation was reviewed as well.