A corrodible downhole article includes a magnesium alloy. The magnesium alloy includes: 1-9 wt % Zn; 1-2 wt % Cu; 0.5-1.0 wt % Mn; and 0.1-5 wt % of a corrosion promoting element (e.g., Ni). The alloy can have a 0.2% proof strength of at least 150 MPa when tested using standard tensile test method ASTM B557-10.

A corrodible downhole article includes a magnesium alloy. The magnesium alloy includes: 1-9 wt % Zn; 1-2 wt % Cu; 0.5-1.0 wt % Mn; and 0.1-5 wt % of a corrosion promoting element (e.g., Ni). The alloy can have a 0.2% proof strength of at least 150 MPa when tested using standard tensile test method ASTM B557-10.

According to one implementation, a magnesium-lithium alloy contains not less than 10.50 mass % and not more than 16.00 mass % lithium, not less than 5.00 mass % and not more than 12.00 mass % aluminum, and not less than 2.00 mass % and not more than 8.00 mass % calcium. According to one implementation, a rolled stock is made of the above-mentioned magnesium-lithium alloy. According to one implementation, a processed product includes the above-mentioned magnesium-lithium alloy as a material.

An injection molding material for magnesium thixomolding includes: a powder containing Mg as a main component; and a chip containing Mg as a main component, in which a proportion of the powder in the injection molding material for magnesium thixomolding is 5 mass % or more and 45 mass % or less, and a tap density of the powder is 0.15 g/cm.sup.3 or more.

This application relates to a wrought magnesium alloy and a method of manufacturing the same, and a high-speed extrusion method for manufacturing an extrudate using the same. In one aspect, the magnesium alloy includes 2.0 wt % to 8.0 wt % of bismuth (Bi), 0.5 wt % to 6.5 wt % aluminum (Al), the balance of magnesium (Mg), and inevitable impurities. Using a magnesium alloy for high-speed extrusion according to the present disclosure, it is possible to manufacture a magnesium alloy extrudate having a good surface quality without hot cracking even under high-temperature (extrusion temperature: 300° C. to 450° C.) and high-speed (die-exit speed: 40 m/min to 80 m/min) extrusion conditions. Furthermore, the extrudate manufactured from the magnesium alloy exhibits greatly improved strength and elongation compared to existing magnesium extrudates even when the alloy does not contain a rare-earth metal.

This application relates to a wrought magnesium alloy and a method of manufacturing the same, and a high-speed extrusion method for manufacturing an extrudate using the same. In one aspect, the magnesium alloy includes 2.0 wt % to 8.0 wt % of bismuth (Bi), 0.5 wt % to 6.5 wt % aluminum (Al), the balance of magnesium (Mg), and inevitable impurities. Using a magnesium alloy for high-speed extrusion according to the present disclosure, it is possible to manufacture a magnesium alloy extrudate having a good surface quality without hot cracking even under high-temperature (extrusion temperature: 300° C. to 450° C.) and high-speed (die-exit speed: 40 m/min to 80 m/min) extrusion conditions. Furthermore, the extrudate manufactured from the magnesium alloy exhibits greatly improved strength and elongation compared to existing magnesium extrudates even when the alloy does not contain a rare-earth metal.

A magnesium alloy sheet according to an embodiment of the present invention includes greater than 3 wt % and less than or equal to 5 wt % of Al, 0.5 wt % to 1.5 wt % of Zn, 0.1 wt % to 0.5 wt % of Mn, 0.001 wt % to 0.01 wt % of B, 0.1 wt % to 0.5 wt % of Y, a balance amount of magnesium, and other inevitable impurities on the basis of a total of 100 wt %.

A magnesium alloy sheet according to an embodiment of the present invention includes greater than 3 wt % and less than or equal to 5 wt % of Al, 0.5 wt % to 1.5 wt % of Zn, 0.1 wt % to 0.5 wt % of Mn, 0.001 wt % to 0.01 wt % of B, 0.1 wt % to 0.5 wt % of Y, a balance amount of magnesium, and other inevitable impurities on the basis of a total of 100 wt %.

The present disclosure provides a high-efficient rolling process for magnesium alloy sheet. Parameters of the rolling process are: the rolling speed of each rolling pass is 10-50 m/min, the rolling reduction of each rolling pass is controlled to be 40-90%, and both the preheating temperature before rolling and the rolling temperature of each rolling pass are 250-450° C. The present disclosure also provides a preparation method for magnesium alloy sheet, comprising: 1) preparing rolling billets; 2) high-efficient hot rolling; and 3) performing annealing. The rolling process can improve the mechanical performance especially, the strength and ductility of the sheet.

The present disclosure provides a high-efficient rolling process for magnesium alloy sheet. Parameters of the rolling process are: the rolling speed of each rolling pass is 10-50 m/min, the rolling reduction of each rolling pass is controlled to be 40-90%, and both the preheating temperature before rolling and the rolling temperature of each rolling pass are 250-450° C. The present disclosure also provides a preparation method for magnesium alloy sheet, comprising: 1) preparing rolling billets; 2) high-efficient hot rolling; and 3) performing annealing. The rolling process can improve the mechanical performance especially, the strength and ductility of the sheet.