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High Strength and Good Ductility in Cu-3Ag-0.5Zr Alloy by Cryo-Rolling and Aging

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Abstract

A combination of high strength and good ductility was achieved in a precipitation hardenable Cu-3Ag-0.5Zr alloy through cryo-rolling (80% reduction in thickness) and aging in the temperature range (200-500 °C). The high-strength sheets produced by cryo-rolling showed a threefold increase in yield strength compared to that of the solution-treated and aged (220 MPa) sample, while retaining good ductility. An optimum combination of high strength (614 MPa) and ductility (8%) was achieved by 80% cryo-rolling and aging at 320 °C for 1 h. The high strength and good ductility obtained was attributed to various microstructural factors such as deformation twins, ultra-fine grains, high dislocation density and fine nano-sized silver precipitates.

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Acknowledgment

The authors would like to thank Dr. K. Sivan Director, Vikram Sarabhai Space Centre, Trivandrum, India, for his kind permission to publish this work.

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Authors and Affiliations

  1. Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Trivandrum, 695 022, India

    S. Chenna Krishna, Abhay K. Jha, Bhanu Pant & P. V. Venkitakrishnan

  2. Department of Metallurgical and Materials Engineering, IIT Madras, Chennai, 600 036, India

    Niraj Chawake & Ravi Sankar Kottada

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  1. S. Chenna Krishna
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Krishna, S.C., Chawake, N., Kottada, R.S. et al. High Strength and Good Ductility in Cu-3Ag-0.5Zr Alloy by Cryo-Rolling and Aging. J. of Materi Eng and Perform 26, 350–357 (2017). https://doi.org/10.1007/s11665-016-2419-3

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