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Study on the transformation mechanism of α1 plates in a Cu-Zn-Ai alloy

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Abstract

Transmission electron microscope (TEM) studies of the bainitic transformation in Cu-25.9 pct Zn-3.75 pct Al alloy were performed. At the initial formation stage from the matrix, precipitated α1 plates were without internal stacking faults. It was found that there exist three-dimensional superledges on the broad faces of α1 plates, with a spacing and height of about 50 to 230 nm and 10 to 40 nm, respectively. Terraces on the faces of α1 plates are parallel to the habit plane, which is (114)α1. Evidence indicates that the superledges are mobile and that the α1 plates thicken by their movement. The results show that growth of α1 plates is consistent with a diffusion-controlled ledgewise mechanism.

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Authors and Affiliations

  1. Division of Metallic Materials, Department of Materials Science and Engineering, Tsinghua University, 100084, Beijing, People’s Republic of China

    Hong-Sheng Fang (Professor) & Chun-Ming Li (Graduate Student)

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  1. Hong-Sheng Fang
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  2. Chun-Ming Li
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Additional information

This article is based on a presentation made at the Pacific Rim Conference on the “Roles of Shear and Diffusion in the Formation of Plate-Shaped Transformation Products,” held December 18-22, 1992, in Kona, Hawaii, under the auspices of ASM International’s Phase Transformations Committee.

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Fang, HS., Li, CM. Study on the transformation mechanism of α1 plates in a Cu-Zn-Ai alloy. Metall Mater Trans A 25, 2615–2619 (1994). https://doi.org/10.1007/BF02649214

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