Solidification of peritectic alloys
Solidification of peritectic alloys
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DOI：
10.1179/imr.1996.41.4.129
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发表时间：
1996-01
影响因子：
16.1
通讯作者：
H. W. Kerr;W. Kurz
中科院分区：
文献类型：
--
作者：
H. W. Kerr;W. Kurz
综述了包埋合金的凝固过程，包括形核和生长。介绍定义了与二元包晶合金相关的各种组合物，它们的“平衡”凝固，多组分包晶系统，以及包晶系统中的亚稳相。根据冷却速率和试样类型对形核研究进行了综述。与共晶合金中的观察结果进行了一些比较。在快速冷却速率下，可能发生亚稳事件，如对基于Al-Ti和其他系统的合金的评论。在包晶合金中的生长研究已经确定了三个阶段：“反应”（三相接触）;“转变”（包晶相通过固态扩散变厚）;和包晶相的“直接凝固”。概述了各个阶段的模型，并与各种二元合金的实验进行了比较，然后总结了多组分Fe-Cr-Ni和Fe-C-X合金中的周晶凝固的观察结果。本文综述了单相凝固的最新进展，并将其应用于Fe-Cr-Ni、Co-Sm-Cu和Fe-Nd-B等合金的快速相选择。本文还讨论了这两种固相的独立生长，如超导Y-Ba-Cu-O合金所示。本文综述了在包晶合金中产生耦合结构的尝试，并讨论了低速带化现象。在目前的实验或理论工作的局限性指出，以帮助未来的工作在这一重要领域。
The solidification of peritectic alloys is reviewed, including both nucleation and growth. The introduction defines various compositions associated with binary peritectic alloys, their ‘equilibrium’ solidification, multicomponent peritectic systems, and metastable phases in peritectic systems. Nucleation studies are reviewed according to the rate of cooling and the type of specimen. Some comparisons are made with observations in eutectic alloys. At fast cooling rates metastable events can occur, as reviewed for alloys based on the Al-Ti and other systems. Growth studies in peritectic alloys have identified three stages: the ‘reaction’ (three phases in contact); the ‘transformation’ (the peritectic phase thickens by solid state diffusion); and ‘direct solidification’ of the peritectic phase. Models of the stages are outlined and compared with experiment for various binary alloys, followed by a summary of observations of peritectic solidification in multicomponent Fe-Cr-Ni and Fe-C-X alloys. Recent advances of single phase solidification are reviewed and applied to phase selection with increased velocity, in peritectic alloys such as in Fe-Cr-Ni, Co-Sm-Cu, and Fe-Nd-B alloys. Independent growth of the two solid phases also is discussed, as illustrated by superconducting Y-Ba-Cu-O alloys. Attempts to produce coupled structures in peritectic alloys are reviewed, followed by a discussion of low velocity banding. Limitations in current experimental or theoretical work are pointed out to aid future work in this important area.