Magnesium alloy sheet processing method and magnesium alloy sheet

Abstract

A magnesium alloy sheet processing method wherein a magnesium alloy sheet is rolled at a speed of 180 m / min or more. Particularly, a magnesium alloy sheet processing method, wherein the magnesium alloy sheet is rolled at a speed of 450 m / min or more. A magnesium alloy sheet processing method, wherein a rolling tool which is not heated is used. A magnesium alloy sheet processing method, wherein the temperature of the magnesium alloy sheet immediately before the rolling is in the range of 0° C. to 400° C. A magnesium alloy sheet, wherein the sheet has an average crystal grain of 4 μm or less, and does not internally include any unbonded interface in parallel with a direction of rolling. A magnesium alloy sheet, wherein the sheet has an average grain size of 4 μm or less, and has an internal grain boundary formed by a clean grain boundary.

Description

TECHNICAL FIELD [0001] The present invention relates to a magnesium alloy sheet processing method and a magnesium alloy sheet, and in particular relates to a method for rolling a magnesium alloy sheet at a speed as high as 180 m / minor more, and to a magnesium alloy sheet having an excellent mechanical strength and the like. BACKGROUND ART [0002] Since a magnesium alloy has a high specific strength and an excellent electromagnetic wave absorption characteristic, the utilization thereof is being increased in casings or the like for portable electronic devices such as mobile phones. Actually, a magnesium alloy has a crystal lattice with a close-packed hexagonal structure, and has, at a room temperature, a deformation mechanism consisting mainly of a basal plane slip that causes deformation in a direction perpendicular to the c axis, thus making it significantly difficult to provide a plastic strain (deformation) of 10% or more at an ambient temperature. Therefore, in order to carry out...

AI Technical Summary

Benefits of technology

The present invention provides a method for processing magnesium alloy sheets at a high speed of 180 m / min or more, which allows for a high rolling reduction while suppressing rupture and cracking of the sheet. This method achieves fine crystal grains in the magnesium alloy sheet, resulting in improved mechanical properties such as strength. The invention also provides a magnesium alloy sheet that is thinner and smoother than conventional sheets, making it more suitable for use in portable electronic devices. The invention is simple and cost-effective in terms of process steps and can enable the fabrication of a magnesium alloy sheet with improved mechanical properties.

Problems solved by technology

Actually, a magnesium alloy has a crystal lattice with a close-packed hexagonal structure, and has, at a room temperature, a deformation mechanism consisting mainly of a basal plane slip that causes deformation in a direction perpendicular to the c axis, thus making it significantly difficult to provide a plastic strain (deformation) of 10% or more at an ambient temperature.

In addition, when rolling is to be carried out, a longitudinal cracking will occur in a material unless the speed at each pass is reduced.

Accordingly, a magnesium alloy has been considered as an unsuitable material for rolling.

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