Abnormal grain growth induced by cyclic heat treatment

Toshihiro Omori, Tomoe Kusama, Shingo Kawata, Ikuo Ohnuma, Yuji Sutou, Yoshikazu Araki, Kiyohito Ishida, Ryosuke Kainuma

Research output: Contribution to journalArticlepeer-review

194 Citations (Scopus)


In polycrystalline materials, grain growth occurs at elevated temperatures to reduce the total area of grain boundaries with high energy. The grain growth rate usually slows down with annealing time, making it hard to obtain grains larger than a millimeter in size. We report a crystal growth method that employs only a cyclic heat treatment to obtain a single crystal of more than several centimeters in a copper-based shape-memory alloy. This abnormal grain growth phenomenon results from the formation of a subgrain structure introduced through phase transformation. These findings provide a method of fabricating a single-crystal or large-grain structure important for shape-memory properties, magnetic properties, and creep properties, among others.

Original languageEnglish
Pages (from-to)1500-1502
Number of pages3
Issue number6153
Publication statusPublished - 2013

ASJC Scopus subject areas

  • General


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