AZ55

AZ55 is a magnesium alloy in the AZ-series, a designation used for magnesium alloys that include aluminum and zinc as primary alloying elements. The AZ family includes several variants (such as AZ31, AZ61, and AZ91), and AZ55 represents a variant with composition tuned for a balance of strength and castability. The exact composition can vary by producer, but it generally comprises magnesium with aluminum and zinc as the main alloying elements, with small additions of manganese to refine the grain structure.

Production and forms: AZ55 is produced through common magnesium processing methods, including die casting, gravity and high-pressure die casting, and extrusion for profiles. It is valued for good castability and the ability to produce complex shapes, making it suitable for parts that require weight reduction and structural integrity.

Properties and processing: Mechanical properties depend on processing, cooling rate, and any post-processing steps. Many AZ-series alloys are not widely used for extensive heat treatment; strength is largely determined by composition and microstructure rather than hardening through aging. Welding and joining magnesium alloys can be challenging due to oxide formation and porosity; specialized filler metals, shielding gas, and corrective procedures are often required.

Applications: AZ55 is used in automotive and aerospace components, as well as electrical housings and consumer electronics enclosures, where lightweight, corrosion performance, and the ability to form complex shapes are important.

Corrosion and protection: Magnesium alloys are more reactive than many metals, so protective coatings, anodizing, or other surface treatments are commonly applied to extend service life in exposed environments.