Baoshan Iron & Steel Co., Ltd.

China Baowu Steel Group Corporation Limited

Nick Birbilis

Shiwei Xu

Pijun Zhang

Weineng Tang

Zhuoran Zeng

Xiaobo Chen

Haomin Jiang

Mingzhe Bian

Cong Ke

Christopher Huw John Davies

Jianfeng Nie

Christopher H J Davies

Jian-Feng Nie

The present invention provides magnesium or magnesium alloys having high formability at room temperature, the magnesium or magnesium alloys having a grain size ≤2 microns. The present invention also provides a method for manufacturing the magnesium or magnesium alloys having high formability at room temperature. The magnesium or magnesium alloys having high formability at room temperature are prepared by simple processing means. The present invention overcomes a problem of poor formability at room temperature.

Magnesium or magnesium alloy having ultra-high formability at room temperature and manufacturing method thereof

A film forming treatment agent for a composite chemical conversion film for magnesium alloy, and a film forming process method, and a composite chemical conversion film are provided. Components of the film forming treatment agent for a composite chemical conversion film for magnesium alloy comprise a water solution and a suspension of reduced graphene oxide flakes to the water solution. The water solution comprises strontium ions at 0.1 mol/L to 2.5 mol/L and phosphate ions at 0.06 mol/L to 1.5 mol/L, and pH of the water solution is 1.5 to 4.5. Concentration of the reduced graphene oxide varies between 0.1 mg/L and 5 mg/L. The film forming process method for a composite chemical conversion film for magnesium alloy comprises the following steps of: 1) pretreatment on surface of magnesium alloy matrix; 2) immersion of magnesium alloy matrix in the film forming treatment agent; and 3) removal of magnesium alloy pieces for drying in air. The composite chemical conversion film for magnesium alloy is formed by immersing magnesium alloy matrix in the film forming treatment agent. The composite chemical conversion film for magnesium alloy has excellent corrosion-resistance performance in 3.5 wt % NaCl solution.

Film forming treatment agent for composite chemical conversion film for magnesium alloy, and film forming process

A method of strengthening a dilute magnesium alloy sheet includes providing a dilute magnesium alloy sheet, which includes a magnesium alloy consisting essentially of (wt %): &#x3e;0 to 3.0 of Zn; &#x3e;0 to 1.5 of Ca; 0 to 1.0 of Zr; 0 to 1.3 of a rare earth element or mixture of the same; 0 to 0.3 of Sr; 0 to 0.7 of Al, the balance of Mg and other unavoidable impurities, wherein the total weight % of alloying elements is less than 3%; subjecting the dilute magnesium alloy sheet to plastic deformation, in which the tensile plastic strain should exceed 0.5%, but be less than 8% to form a pre-deformed magnesium alloy sheets; and subjecting the pre-deformed magnesium alloy sheets to an ageing treatment in a temperature range of 80 to 250&#xb0; C. for at least 1 minute, thereby forming a strengthened magnesium alloy sheet.

Strain-induced age strengthening in dilute magnesium alloy sheets

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Clayton, Australia

Nick Birbilis