V. V. Ravikumar and S. Kumaran, Improved strength and ductility of high alloy containing Al-12Zn-3Mg-2.5Cu alloy by combining non-isothermal step rolling and cold rolling, Int. J. Miner. Metall. Mater., 24(2017), No. 2, pp. 179-185. https://doi.org/10.1007/s12613-017-1393-6
Cite this article as:
V. V. Ravikumar and S. Kumaran, Improved strength and ductility of high alloy containing Al-12Zn-3Mg-2.5Cu alloy by combining non-isothermal step rolling and cold rolling, Int. J. Miner. Metall. Mater., 24(2017), No. 2, pp. 179-185. https://doi.org/10.1007/s12613-017-1393-6
Research Article

Improved strength and ductility of high alloy containing Al-12Zn-3Mg-2.5Cu alloy by combining non-isothermal step rolling and cold rolling

+ Author Affiliations
  • Corresponding author:

    S. Kumaran    E-mail: kumara_rec@yahoo.co.in

  • Received: 22 September 2016Revised: 15 October 2016Accepted: 17 October 2016
  • Al-12Zn-3Mg-2.5Cu alloy was prepared using a liquid metallurgy route under the optimized conditions. A sample cut from the ingot was rolled non-isothermally from 400℃ to 100℃ in 100℃ steps, with 15% reduction in thickness; it was then cold rolled isothermally at room temperature for 85% reduction. The cold-rolled alloys were characterized by electron microscopy, hardness test, and tensile test to elucidate their structural evolution and evaluate their mechanical behavior. In the results, the cast alloy consists of α-aluminum and various intermetallic compounds. These compounds are segregated along the grain boundaries, which makes the alloy difficult to roll at room temperature. The combined effect of non-isothermal step rolling and cold rolling results in the nano/microsized compounds distributed uniformly in the matrix. The hardness is substantially increased after rolling. This increase in hardness is attributed to the ultra-fine grain size, fine-scale intermetallic compounds, and structural defects (e.g., dislocations, stacking faults, and sub-grains). The ultimate tensile strength of the rolled alloy is approximately 628 MPa with 7% ductility.
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