| 摘要 |
The present invention relates to a method to manufacture a magnesium alloy for plastic working with excellent thermal conductivity and excellent flame retardancy of which a total amount of an alloy element is 2.5-6 wt% by selectively adding 1.0 wt% or less of at least one type among Ca, Si, Mn, and Sn when necessary to the magnesium while containing at least one type among 0.5-5 wt% of Zn and 0.3-2.0 wt% of mischmetal. The process of manufacturing the alloy comprises: a step of adding and melting alloy elements with a high melting point as a base alloy after manufacturing molten steel wherein magnesium and a zinc alloy are contained in a crucible mold inside a blast furnace; a step of manufacturing the magnesium alloy casting material by mechanically mixing while cooling the crucible mold wherein the magnesium alloy molten steel is contained; a step of removing a coating structure of the casting material; and a step of tempering the casting material with a method such as a rolling method, an extruding method, or a forging method after diffusion annealing. According to the present invention, ductility is improved by a reaction of the alloy elements preventing a formation of plate-shaped precipitates inside a magnesium base structure. In addition, the capacity for plastic working the magnesium alloy is improved such that an extrusion at a pressure of 1000 kgf/cm^2 or less is possible. Furthermore, the magnesium alloy obtains flame retardancy and thermal conductivity of 100 W/m-K or higher satisfying the specifications of a material for an aircraft; thereby being suitable for a material in which fire safety is required. Accordingly, the magnesium alloy is able to widely be applied to a material for a structure or a radiating plate of portable home appliances, a vehicle, or an aircraft compartment; and contributes to a weight decrease of the product. |
