Laser-Treated Microstructure and Mechanical Properties in Ultralight Rolled and Annealed Mg-7.28Li-2.19Al-0.1Y Alloy Sheets Volume 3 - Issue 5

Furong Cao*, Bijin Zhou and Renjie Liu

• School of Materials Science and Engineering, Northeastern University, Shenyang, PR China

Received: March 04, 2021;   Published: March 15, 2021

*Corresponding author: Furong Cao, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, PR China

DOI: 10.32474/MAMS.2021.03.000175

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Abstract

A new Mg-7.28Li-2.19Al-0.1Y alloy has been fabricated by rolling, and the rolled and annealed sheets were subjected to laser surface treatment. The microstructure and mechanical properties were investigated. The rolled alloy demonstrates ultimate tensile strength (UTS) of 299.48 MPa and elongation-to-failure (EL) of 15.71%; the annealed alloy demonstrates the UTS of 211 MPa and EL of 26.5%; laser treated rolled sample exhibits the UTS of 215 MPa and EL of 21.96%, and laser treated annealed sample exhibits the UTS of 205 MPa and EL of 19.15%. Laser treatment refines significantly the grains of Mg-7.28Li-2.19Al-0.1Y alloy, but laser treatment does not improve its mechanical properties due to its role of softening in the present alloy. The laser treatment softening phenomenon in this alloy is the first report of laser treated Mg-Li alloy.

Keywords: Mg-Li alloy; laser surface melting; microstructure; mechanical property

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