Abstract
AbstractMagnesium alloys are one of the lightest commercial metals, and applications of wrought magnesium alloys may lead to a substantial weight reduction of transportation vehicles. However, applications of wrought magnesium alloys are limited due to processing costs. This chapter discusses the requirements to broaden their applications through a brief review of existing wrought alloys. Then, a heat treatable wrought magnesium alloy is proposed as a new design concept for the wrought magnesium alloy. As an industrially viable precipitation hardenable alloy, Mg–Ca–Al(–Zn) dilute alloy is developed. A high strength Mg–Al–Ca–Mn alloy extrudable at high speed and a bake-hardenable Mg–Al–Ca–Mn–Zn alloy sheet with excellent room temperature formability and satisfactory strength are demonstrated, indicating the promising potential to develop heat treatable wrought magnesium alloys.
Highlights
Magnesium alloy has received revived research interest owing to ever increasing demand for lightweight materials in the transportation sector to lower the emission of greenhouse effect gases by weight reduction
If wrought magnesium alloys are to substitute some of these materials, the best target materials would be Al–Mg–Si-based (6XXX series) alloys, which are used as body panels, door frames, and space frames
A heat treatable alloy was introduced as a novel wrought magnesium alloy that would broaden alloy applications in the transportation sector
Summary
Magnesium alloy has received revived research interest owing to ever increasing demand for lightweight materials in the transportation sector to lower the emission of greenhouse effect gases by weight reduction. If wrought magnesium alloys can substitute some of the structural components in automotive bodies, further reduction of weight is expected. There are limited applications of wrought alloys due to their poor mechanical properties, low corrosion resistance, flammability, and high cost of processing. The development of novel wrought alloys is essential to broaden the applications of magnesium alloys to automotive bodies. This chapter discusses the requirements to make wrought magnesium alloys industrially viable through a brief review of their mechanical properties. A new concept to achieve improved mechanical properties is presented along with examples of novel heat treatable wrought magnesium alloys.
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