TWI456071B - Magnesium alloy for high temperature and manufacturing method thereof - Google Patents

Claims (18)

A method for producing a magnesium alloy for high temperature, comprising the steps of: melting a magnesium or magnesium alloy into a liquid state; and adding 0.5 to 4.0 wt% of CaO to a surface of the molten metal on which the magnesium or magnesium alloy is melted; The surface reduction reaction of the molten metal and the CaO described above consumes CaO such that CaO does not substantially remain in the magnesium or magnesium alloy at least; and at least the Ca formed in the magnesium or magnesium alloy by the surface reduction reaction is at least reacted In part, to form a compound, the above compound includes at least one of a Mg-Ca compound, an Al-Ca compound, and a Mg-Al-Ca compound. The method for producing a high-temperature magnesium alloy according to claim 1, which comprises the step of adding CaO of 1.4 times the final Ca target weight to the surface of the molten metal on which the magnesium or magnesium alloy is melted. The method for producing a high-temperature magnesium alloy according to the first aspect of the invention, wherein the added CaO is 1.0 to 3.5% by weight. The method for producing a high-temperature magnesium alloy according to the first aspect of the invention, wherein the amount of Ca is 0.8 to 2.4% by weight. The method for producing a high-temperature magnesium alloy according to the fourth aspect of the invention, wherein the final composition of the Mg alloy is Al: 6.0 to 8.0 wt%, Mn: 0.1 to 0.3 wt%, and Sr: 0.2 to 0.3 wt%, Zn: 0.04 wt% or less, Sn: 0.9 wt% or less, and the remainder is Mg. The method for producing a high-temperature magnesium alloy according to claim 1, wherein the compound produced is at least Mg2. Ca or Al2 Ca or (Mg, Al) 2 One of the Ca. A magnesium alloy for high temperature, characterized in that after adding 0.5 to 4.0% by weight of CaO to the surface of the molten magnesium or magnesium alloy, a part or all of the above CaO is consumed by surface reduction reaction of the above CaO, thereby producing the above a magnesium-based alloy, wherein the magnesium-based alloy comprises a compound formed by combining Mg with a Mg element in the magnesium-based alloy or other elements constituting the alloy, so that the high-temperature mechanical property of the Mg-based alloy is greater than that of directly adding CaO. The high temperature mechanical properties of the Mg alloy of the same composition, wherein the above compound includes at least one of a Mg-Ca compound, an Al-Ca compound, and a Mg-Al-Ca compound. The high-temperature magnesium alloy according to claim 7, wherein the high-temperature mechanical properties are high-temperature yield strength or high-temperature tensile strength. The high-temperature magnesium alloy according to claim 7, wherein the CaO added is 1.0 to 3.5% by weight. The high-temperature magnesium alloy according to claim 7, wherein the amount of the Ca is 0.8 to 2.4% by weight. The high-temperature magnesium alloy according to claim 10, wherein the final composition of the Mg alloy is Al: 6.0 to 8.0 wt%, Mn: 0.1 to 0.3 wt%, and Sr: 0.2 to 0.3 wt%, Zn: 0.04 wt% or less, Sn: 0.9 wt% or less, and the remainder is Mg. The high-temperature magnesium alloy according to claim 7, wherein the compound formed as described above is at least Mg2 Ca or Al2 Ca or (Mg, Al)2 One of the Ca. A magnesium alloy for high temperature, characterized in that after adding 0.5 to 4.0% by weight of CaO to the surface of the molten magnesium or magnesium alloy, a part or all of the above CaO is consumed by surface reduction reaction of the above CaO, thereby producing the above a magnesium-based alloy, wherein the magnesium-based alloy comprises a compound formed by combining Mg with a Mg element in the magnesium-based alloy or other elements constituting the alloy, so that the high-temperature elongation and the high-temperature creep deformation rate of the Mg-based alloy are smaller than The high-temperature elongation and the high-temperature creep deformation ratio of the Mg alloy of the same composition produced by CaO are directly added, wherein the above compound includes at least one of a Mg-Ca compound, an Al-Ca compound, and a Mg-Al-Ca compound. The high-temperature magnesium alloy according to claim 13, wherein the CaO added is 1.0 to 3.5% by weight. The high-temperature magnesium alloy according to claim 13, wherein the amount of the Ca is 0.8 to 2.4% by weight. The high-temperature magnesium alloy according to claim 15, wherein the final composition of the Mg alloy is Al: 6.0 to 8.0 wt%, Mn: 0.1 to 0.3 wt%, and Sr: 0.2 to 0.3 wt%, Zn: 0.04 wt% or less, Sn: 0.9 wt% or less, and the remainder is Mg. The high-temperature magnesium alloy according to claim 13, wherein the compound formed as described above is at least Mg2 Ca or Al2 Ca or (Mg, Al) 2 One of the Ca. A magnesium alloy for high temperature, characterized in that CaO is added to the surface of a molten magnesium or magnesium alloy to be produced by surface reduction reaction of CaO described above The above-mentioned Mg-based alloy is formed by adding a Mg alloy of the same composition which is directly produced by CaO, and the strength and elongation in the mechanical properties at room temperature are simultaneously increased, wherein the above-mentioned Mg-based alloy includes a compound, and the above-mentioned compound includes Mg- At least one of a Ca compound, an Al-Ca compound, and a Mg-Al-Ca compound.