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Magnesium (Mg) alloy has been attracting great attention as a promising light-metal material which has various potential applications because of its various unique and great properties. They are, for example, a smaller density, about two-thirds of Al, the greatest specific strength among all the metals, superior machining property, shielding of electromagnetic wave, and vibration absorbability. Taking advantage of them, Mg is expected to be used as structural components for automobile, lap-top computer, cell phone, and you name it, and it could replace aluminum in many areas. In general, the weight of any products with Mg body would be reduced which enables us to handle the products easier. More specifically, for example, Mg body could increase the gas mileage of automobile and protect computers and cell phones from unexpected vibration or electromagnetic waves. In spite of the numerous advantages, however, Mg materials have not been used widely up to now. It is because there is a drawback to the workability in Mg. In the metal forming process, in general, press forming is popular, which increases the productivity and decreases the manufacturing cost and environmental load. However, since seizing of Mg in press forming is easily happened, forming of Mg is often processed by forging and diecasting. The formability of Mg alloys is especially poor at room temperature because of their hexagonal close-packed structure. Hence, there are few slip planes in the case of a pyramid surface or cylinder surface at room temperature. Furthermore, these slip planes are easily activated at elevated temperatures. Therefore, the deep-drawing process of Mg alloy sheets is generally conducted at high temperatures (approximately 200 °C). During the deepdrawing process, even at an elevated temperature, it is necessary to use a lubricant, such as molybdenum disulfide (MoS2) based grease, which can maintain the performance. However, such lubricants have disadvantages such as a high cost, difficulty in degreasing and poor workability. Moreover, the large amount of lubricant waste raises has an adverse effect on the environment. Therefore, new techniques of lubrication that have less impact on the environment are immediately required. In recent years, various studies on dry press forming, which does not involve the use of any lubricants during plastic processing, have been performed (Kataoka, 2006). Dry press forming is also attractive as a forming technique with zero emissions. However, it is difficult to apply this method to the forming of metal sheets.

DLC Coating on Magnesium Alloy Sheet by Low-Temperature Plasma for Better Formability