Enforce standards: ISO:MgAl9Zn1 EN:EN-MC21310 ASTM:AZ91D GB/T:AZ91D JIS:MDC1D

AZ91D Chemical Composition (Weight %)

The key to AZ91D’s excellent corrosion resistance is its high purity, with very strict limits on critical impurity elements.

Element	Symbol	Composition (%)	Notes
Aluminum	Al	8.3 – 9.7	Primary alloying element, improves strength and castability.
Zinc	Zn	0.35 – 1.0	Secondary alloying element, contributes to strength.
Manganese	Mn	≥ 0.15	Critical element. Combines with iron to form precipitates, mitigating its harmful effect and improving corrosion resistance.
Silicon	Si	≤ 0.10	Impurity.
Iron	Fe	≤ 0.005	Strictly controlled. Harmful impurity, severely reduces corrosion resistance.
Copper	Cu	≤ 0.030	Strictly Controlled. Harmful impurity, severely reduces corrosion resistance.
Nickel	Ni	≤ 0.002	Strictly Controlled. Harmful impurity, severely reduces corrosion resistance.
Other Impurities	–	≤ 0.02	Each, not specified individually.
Magnesium	Mg	Balance	Base metal.

Thickness：0.5-200mm

Size：300-600mm

Application Range of AZ91D Magnesium Alloy

AZ91D is the most widely used die-casting magnesium alloy. Its primary applications are driven by the need for weight reduction, good structural strength, and electromagnetic shielding.

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1. Automotive & Transportation (Largest Application Sector)

The main goal here is lightweighting to improve fuel efficiency and reduce emissions. AZ91D is typically used for non-critical or moderately stressed components.

• Powertrain Systems:
  • Engine Valve Covers
  • Transmission Housings / Clutch Housings
  • Oil Pump Housings
  • Intake Manifolds
• Interior & Body Systems:
  • Seat Frames
  • Steering Wheel Cores / Armatures
  • Instrument Panel / Cross Car Beam Supports
  • Bracket for pedals
• Chassis Systems:
  • Wheel Rims (for certain models, though AM-series alloys are now often preferred for higher toughness)

2. Consumer Electronics & 3C Products (High-Growth Sector)

This is where most consumers directly experience magnesium alloys. AZ91D provides a premium “metal feel,” shielding against electromagnetic interference (EMI), and allows for thin, strong, and light designs.

• Laptops & Notebooks:
  • Top Covers (Lid)
  • Bottom Cases / Base Enclosures
  • Palm Rests
• Digital Cameras & Camcorders:
  • Body Frames and Outer Housings
• Mobile Phones / Smartphones:
  • Internal Brackets and Structural Frames (common in earlier models)
• Other Electronic Housings:
  • Projectors
  • Hard Disk Drive (HDD) Enclosures
  • Power Tool Housings (e.g., drills, saws)

3. Industrial & Commercial Equipment

AZ91D is used to reduce the weight of portable equipment and components, improving maneuverability and energy consumption.

• Portable Devices:
  • Handheld Scanners
  • Industrial Controllers
• Components:
  • Gearboxes for small machinery
  • Covers and housings for pumps and motors

4. Aerospace & Defense (Limited, Specific Applications)

In this sector, AZ91D is used for non-critical components where its specific properties are advantageous. For primary structures, more advanced (and expensive) alloys like WE43 are typically used.

• Aircraft:
  • Accessory Housings
  • Cockpit Instrument Panel Frames
  • Covers for avionics equipment
• Defense:
  • Housings for guidance systems
  • Components in portable communication devices

5. Sports & Recreational Equipment

The lightweight nature of AZ91D enhances performance and user comfort in sports gear.

• Cycling:
  • Bicycle Frames (for some models)
  • Wheel Hubs
• Outdoor & Other:
  • Archery Bow Frames
  • Heads for Golf Clubs (early models)
  • Ladders and other portable equipment