集成计算材料工程在钛合金微观结构设计中应用的进展-中国材料进展

文章信息/Info

Title:: Progress in ICME Approach to Design of Novel Microstructures for Ti-Alloys

Author(s):: Dong Wang; Yunzhi Wang; Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China

摘要:: 基于集成计算材料工程的思想，结合CAPHAD、相场动力学模拟与关键的实验测量手段，以及钛合金中最新发现的非传统的固 - 固相变，近来提出的伪调幅分解相变机制为钛合金微观结构设计提出了新的方向。这一机制首先被Ni 和Khachaturyan提出并用来解释斜纹组织的形成，并被Fraser等人引入到钛合金体系，Banerjee和wang等人通过实验和模拟证明其正确性，这种新的转变途径为设计具有超细、超均匀???相微观结构新型钛合金提出了新的设计思路，并且有可能产生新的机械性能。另外，为了扩展超细、超均匀钛合金微观结构的温度及成分发生范围，基于存在的热力学数据库，Fraser等人提出了一种通过预先预相分离来产生成分和结构不均匀，进而改进钛合金微观结构的新方法，我们基于热力学数据库和相场动力学的计算机模拟证明其存在。本文中，我们对集成计算材料工程方法在提高设计与选择具有超细、超均匀微观结构的钛合金的效率方面进行了评论总结，集成计算材料工程为钛合金的开发设计提供了新的思路。

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.