AZ31B is one of the most commonly used magnesium alloys. It is a lightweight material with excellent machinability, weldability, and corrosion resistance, making it ideal for various structural and industrial applications.

1. Chemical Composition

2. Standards

AZ31B magnesium alloy complies with the following international standards:

• ASTM B90/B90M: Standard Specification for Magnesium-Alloy Sheet and Plate.
• AMS 4375: Aerospace Material Specification for magnesium alloy sheet and plate.
• ISO 3116: Standard for magnesium alloy ingots and castings.

3. Properties

(a) Mechanical Properties

• Tensile Strength: ~220-275 MPa
• Yield Strength: ~150-200 MPa
• Elongation: ~6-20% (depends on the temper condition)
• Hardness: ~50-60 HB

(b) Physical Properties

• Density: 1.77 g/cm3 (about 33% lighter than aluminum).
• Thermal Conductivity: ~96 W/m·K.
• Melting Point: ~595°C.

(c) Key Features

• Lightweight: Ideal for weight-critical applications.
• Good Machinability: Can be easily machined into complex shapes.
• Corrosion Resistance: Moderate, with improved resistance when surface treated.
• Weldability: Excellent for welding and forming processes.

4. Applications

(a) Aerospace Industry

• Aircraft fuselage and structural components requiring high strength-to-weight ratio.
• Interior components such as seat frames and brackets.

(b) Automotive Industry

• Lightweight parts such as transmission casings, steering wheels, and dashboard frames.
• Structural components in racing cars for weight reduction.

(c) Industrial Applications

• Machinery components, ladders, and scaffolding requiring lightweight yet strong materials.
• Power tools and robotic arms to reduce operator fatigue.

(d) Consumer Electronics

• Casings for laptops, cameras, and portable devices due to its lightweight and thermal conductivity.

(e) Medical Devices

• Used in temporary orthopedic implants and surgical instruments due to its biocompatibility.
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