Sumitomo Electric Industries, Limited

Kohji Inokuchi

Nozomu Kawabe

Takayasu Sugihara

Masahiro Yamakawa

Osamu Mizuno

Koji Mori

Nobuyuki Okuda

Yukihiro Oishi

Masatada Numano

Ryuichi Inoue

Mitsutaka Tsubokura

Masayuki Nishizawa

Yugo Kubo

The magnesium alloy sheet disclosed herein has dispersed therein particles of an intermetallic compound containing an additive element (e.g., Al) and Mg (a typical example of which is MgAl), and the ratio obtained by dividing the diffraction intensity of the main diffraction plane (4,1,1) of the intermetallic compound by the diffraction intensity of the c plane (0,0,2) of the Mg alloy phase in an XRD analysis of the surface of the sheet is 0.040 or more. The method includes: a casting step of producing a cast material composed of a magnesium alloy containing an additive element by continuous casting; a heat treatment step of holding the cast material at 400&#xb0; C. or higher and then cooling the cast material at a cooling rate of 30&#xb0; C/min or less to produce a heat-treated material; and a rolling step of subjecting the heat-treated material to warm rolling to produce a rolled sheet.

Magnesium alloy sheet and method for producing same

A magnesium alloy sheet is made of a magnesium alloy containing Al. Particles of an intermetallic compound containing at least one of Al and Mg are present in the sheet in a dispersed state. The sheet includes an oxide film which extends substantially over the surface of the sheet and which has a uniform thickness. The average size of the particles of the intermetallic compound is 0.5 &#x3bc;m or less. The percentage of the total area of the particles is 11% or less. Therefore, the magnesium alloy sheet is excellent corrosion resistance. A magnesium alloy structural member is provided.

Magnesium alloy sheet

A magnesium alloy material having excellent impact resistance is provided. The magnesium alloy material is composed of a magnesium alloy that contains more than 7.5% by mass of Al and has a Charpy impact value of 30 J/cmor more. Typically, the magnesium alloy material has an elongation of 10% or more at a tension speed of 10 m/s in a high-speed tensile test. The magnesium alloy is composed of a precipitate, typically made of an intermetallic compound containing at least one of Al and Mg, and contains particles having an average particle size of 0.05 &#x3bc;M or more and 1 &#x3bc;m or less dispersed therein. The total area of the particles accounts for 1% by area or more and 20% by area or less. The magnesium alloy material containing fine precipitate particles dispersed therein has high impact absorption capacity through dispersion strengthening and has excellent impact resistance.

Magnesium alloy material

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Itami, Japan

Kohji Inokuchi