合金连续相变研究的最新进展

Recent Advance on Studies of Continuous Transformation in Alloys

评述了过去２０多年来有关合金调幅分解和连续有序化过程的研究情况，指出这种普遍化处理实质上澄清了合金中有序／无序反应。浓度波理论和倒易空间的近似方法提供了研究连续相变的基础，运用这些概念结合自由能－成分和相图系统评述了连续相变中的基本规律。最后根据我们的最近研究结果讨论了有序化和调幅分解共存反应的实质，并提出了利用连续相变使合金产生天然纳米材料的新概念以及合金中产生天然纳米组织的成分设计和制订热处理工艺的基本准则。

ver the past two decades,a unified view of spinodal decomposition and continuous ordering processes has evolved,and this generalized perspective has substantially clarified the nature of order-disorder reactions in alloys,and the interplay of ordering and clustering in precipitation systems.The concept of concentration waves and the reciprocal lattice approach provide the foundation of this modern view of continuous phase transformations.Herein,these concepts are combined with free energy-composition and phase diagrams to survey systematically and interpret the continuous transformation occuring in metallic solid solution.Finally,the coexistance of phase decomposition and ordering in alloys has been discussed,and a new ideas to produce“natural nano-materials”is provided,where applying the continuous transformations to the alloys investigated and the giudelines of the composition design and technologies of heat treatment for obtaining natural nano-materials are discussed.