■What are the features of AZ91 alloy sheet?
AZ91 alloy sheet is as light as conventional materials, and is characterized by ever-higher strength and excellent specific strength (among the highest of the practical metals). This material also features excellent dent and impact resistance (Fig. 1).
The strength and ultimate elongation are significantly higher than those of AZ91 alloy casting material. The strength is 380 MPa (1.5 times or more that of AZ91 alloy casting material), and the ultimate elongation is 10% or more (several times that of AZ91 alloy casting material). Meanwhile, stamping workability is equivalent to that of AZ31 alloy sheet.
The corrosion resistance of AZ91 alloy sheet is among the highest of commercialized magnesium alloys.
Most of the processes currently used (e.g., surface treatment, painting) are applicable. Painting and processing with sophisticated designs are also possible (Fig. 2).
The material can be painted with sophisticated designs because a wide range of paints can be used. Grinding by diamond cutting and surface treatment with metallic textures, which were considered difficult for conventional magnesium alloys, can also be achieved.
Magnesium alloys are expected to be employed in various products, not only for use in electronic devices but also in vehicles and railway cars.