A comparison of repetitive corrugation and straightening and high-pressure torsion using an Al-Mg-Sc alloy | Zendy

Prabhakar M. Bhovi | Zendy; Deepak C. Patil | Zendy; S.A. Kori | Zendy; K. Venkateswarlu | Zendy; Yi Huang | Zendy; Terence G. Langdon | Zendy

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A comparison of repetitive corrugation and straightening and high-pressure torsion using an Al-Mg-Sc alloy

Author(s) -

Prabhakar M. Bhovi,

Deepak C. Patil,

S.A. Kori,

K. Venkateswarlu,

Yi Huang,

Terence G. Langdon

Publication year - 2016

Publication title -

journal of materials research and technology

Language(s) - English

Resource type - Journals

eISSN - 2214-0697

pISSN - 2238-7854

DOI - 10.1016/j.jmrt.2016.03.009

Subject(s) - materials science , alloy , torsion (gastropod) , severe plastic deformation , homogeneity (statistics) , indentation hardness , grain size , rotational speed , composite material , metallurgy , microstructure , mechanical engineering , mathematics , medicine , surgery , statistics , engineering

A comparative study was conducted to evaluate the influence of two different severe plastic deformation (SPD) processes: repetitive corrugation and straightening (RCS) and high-pressure torsion (HPT). Samples of an Al-3Mg-0.25Sc alloy with an initial grain size of ∼150 μm were processed by RCS through 8 passes at room temperature either without any rotation during processing or with a rotation of 90° around the longitudinal axis between each pass. Thin discs of the alloy were also processed for up to 5 turns by HPT at room temperature. The results show that both procedures introduce significant grain refinement with average grain sizes of ∼0.6–0.7 μm after RCS and ∼95 nm after HPT. Measurements of the Vickers microhardness gave values of ∼128 after RCS and ∼156 after HPT. The results demonstrate that processing by HPT is the optimum processing technique in achieving both high strength and microstructural homogeneity.

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