AZ91D Magnesium Alloy
AZ91D Magnesium Alloy
Product Datasheet
Product Datasheet
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AZ91D magnesium alloy is the most extensively used die-casting magnesium alloy worldwide. Belonging to the Mg–Al–Zn system, it delivers an excellent balance of castability, mechanical strength, corrosion resistance, and cost efficiency, making it the benchmark material for high-pressure die casting (HPDC).
1. Key Characteristics and Advantages
AZ91D is engineered for stable production performance and excellent cast surface quality. It is ideally suited for mass production of thin-wall and lightweight structural components.
Main technical advantages:
Superior fluidity and mold filling for thin-wall castings (<2.5 mm)
Stable mechanical performance at room temperature
Good corrosion resistance without the need for rare-earth elements
Excellent coating, painting, and electrophoresis compatibility
Mature global supply chain and predictable manufacturing cost
2. Chemical Composition (wt.%)
Precise control of impurities such as Fe, Cu, and Ni is essential to achieve consistent corrosion performance.
3. Typical Mechanical Properties
Note: For applications requiring high ductility or impact strength, AM60 or AM50 should be considered instead of AZ91D.
These properties make AZ91D suitable for load-bearing, dimensionally stable, and lightweight cast components, particularly in the automotive and electronics industries.
4. Die Casting and Processability
AZ91D is optimized for high-pressure die casting, offering reliable filling behavior and consistent microstructure under controlled conditions.
Process characteristics:
Excellent mold filling and thin-wall capability
Low shrinkage and good dimensional stability
Fine grain structure and high-quality surface finish
Not suitable for thixomolding or semi-solid processing without composition modification
5. Comparison with Other Common Magnesium Alloys
Engineering recommendation:
Choose AZ91D when high strength, corrosion resistance, and cost efficiency are top priorities in die-cast products.
6. International Standards and Equivalents
These standards ensure material traceability and compatibility across international projects and suppliers.
7. Engineering Recommendations
Use AZ91D when
Cost-effective lightweight design and high-volume production are required.
Corrosion performance and aesthetic surface finish are important.
The operating temperature remains below 120 °C in long-term use.
Avoid AZ91D when
High impact toughness or ductility is critical.
Welding is required.
Semi-solid or thixomolding processes are planned.
8. Expert FAQ
Q: Is AZ91D suitable for outdoor environments?
Yes. With proper coating, anodizing, or electrophoretic treatment, AZ91D performs well in outdoor conditions.
Q: Can AZ91D die-castings be welded?
Welding is generally not recommended due to potential reduction in strength and corrosion protection.
Q: Why is AZ91D the global standard magnesium alloy for die casting?
Because it offers the most balanced combination of performance, manufacturability, and cost among all commercial magnesium alloys.
Engineering Insight (Aikerly R&D Center):
When evaluating new magnesium alloys or lightweight die-casting solutions, benchmark against AZ91D for baseline performance in corrosion resistance, mechanical stability, and cost-to-weight ratio.
The magnesium alloy grades in China equivalent to AZ91D are as follows:
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