Magnesium Alloys Applied to Automotive Industry
SAIC MOTOR is a pioneer by making from magnesium alloys the housing of gearbox, covers and shells of clutches of SANTANA; FAW is on the stage of developing with magnesium alloys cover of engines, shells of clutches, gear chambers covers of gear chamber, and other samples of small quantity; DFM has its own search and development system of the application of magnesium alloys. Recently, DFW has invested in production lines of 630, 800, 1600 magnesium alloy die-casting parts. With these production lines, 16 auto parts have gone into mass production, including covers of gearbox, pedals, diaphragms of vacuum boosters, and brake valves, which are assembled and seen in the market with large quantities.
The next goal for the application of magnesium alloys to automotive industry is parts for engine and hydraulic system. In order to meet the requirement of engine parts whose ambient temperature is high, European and American countries have recently developed AE, Mg-Al-Ca, Mg-Al-Ca-Re, AJ series and ZAC8506 one after another, which are anti-creeping magnesium alloys of high strength, and MRI201S, MRI202S and MRI203S, which are heat-resistant. Presently, magnesium alloys that are under being developed or that have been successfully developed are corrosion-resistant, flame-retardant, of high-strength and high tenacity, wrought and so on. The wrought magnesium alloys, which can be divided into two main type: Mg-Al-Zn series (AZ31C, AZ61A and AZ80A) and Mg-Zn-Zr (ZK60), are potential in the application to body parts (car doors, covers of engines, and trunks), frames of doors and windows, of seats, of base and of car's body.
Theoretically, the density of magnesium is less than that of aluminum, so under the condition of the same weight, magnesium alloy ingot can produce more than one third of die casting parts than aluminum alloy ingot can. In the traditional die casting production process, however, the former can hardly gain direct price competitiveness. The die casting scrap of the latter can be directly back to the furna