Microstructures and Mechanical Properties of Cu–38 mass%Zn Alloy Fabricated by Different Rolling Pass Schedules

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  • Li Yanshuo
    Division of Mechanical Science and Engineering, Graduate School of Natural Science and Technology, Kanazawa University
  • Koga Norimitsu
    Faculty of Mechanical Engineering, Institute of Science and Engineering, Kanazawa University
  • Watanabe Cihiro
    Faculty of Mechanical Engineering, Institute of Science and Engineering, Kanazawa University
  • Miura Hiromi
    Department of Mechanical Engineering, Toyohashi University of Technology

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<p>The heterogeneous-nano (HN) structure consisting of twin domains, shear bands, and lamellar grains developed by heavy cold rolling of FCC metals with low stacking fault energy is known to provide extremely high strength. In the present study, the effects of the rolling pass schedule on the development of HN structure and the mechanical properties in a Cu–38 mass%Zn alloy were investigated. Rolling was conducted on two different pass schedules; one was conventional unidirectional rolling (1-DR) up to 90% reduction in thickness, and the other was the two-directional rolling (2-DR), in which the specimen was unidirectionally rolled to 25% reduction, then rotated 90° around the rolling direction, and subsequently, unidirectionally rolled up to the total reduction of 90%. At a total reduction of 50%, the number of grains with deformation twins in the 2-DR specimen was higher than that in the 1-DR specimen. Further cold rolling up to 90% produced the HN structure in both specimens. The size of twin domains in the 2-DR specimen was finer and their volume fraction was larger than those in the 1-DR specimen. Also, the 2-DR specimen exhibited a better strength-elongation balance than the 1-DR specimen. It can be concluded that the finer size and larger volume fraction of the twin domains effectively improved the strength-elongation balance in the 2-DR specimen.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Japan Institute of Copper 60 (2021) 11–15. The abstract and caption of Fig. 6 have been slightly modified.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 63 (4), 497-501, 2022-04-01

    公益社団法人 日本金属学会

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