Overview
AZ61A Magnesium Alloy is a medium-to-high strength wrought magnesium alloy containing approximately 6% aluminum and 1% zinc, offering an excellent balance of lightweight properties, strength, corrosion resistance, machinability, and fatigue performance.
Compared with AZ31B, AZ61A provides significantly higher strength while maintaining good formability and weldability. This makes it suitable for aerospace, automotive, defense, sporting goods, and high-performance engineering applications where lightweight structures must withstand higher mechanical loads.
AZ61A magnesium alloy is widely used in:
- Aerospace Components
- Automotive Structures
- Defense Equipment
- Sporting Goods
- Lightweight Machinery Parts
- Electronic Housings
- Structural Brackets
- Performance Components
Due to its combination of low density and enhanced mechanical strength, AZ61A is frequently selected for weight-sensitive applications requiring improved load-bearing capability.
Material Specification
| Property | Value |
|---|---|
| Material Designation | AZ61A Magnesium Alloy |
| ASTM Standard | ASTM B107 |
| UNS Number | M11610 |
| Material Family | Magnesium-Aluminum-Zinc Alloy |
| Density | 1.81 g/cm³ |
| Magnetic Property | Non-Magnetic |
| Typical Supply Condition | Annealed (O), H24 |
| Standard Forms | Sheet, Plate, Bar, Rod, Extrusions, Forgings |
Chemical Composition
| Element | Content (%) |
|---|---|
| Magnesium (Mg) | Balance |
| Aluminum (Al) | 5.8–7.2 |
| Zinc (Zn) | 0.4–1.5 |
| Manganese (Mn) | 0.15–0.50 |
| Silicon (Si) | ≤0.10 |
| Copper (Cu) | ≤0.05 |
| Iron (Fe) | ≤0.005 |
| Nickel (Ni) | ≤0.005 |
The higher aluminum content increases strength and hardness compared with AZ31B.
Mechanical Properties
Annealed (O) Condition
| Property | Value |
|---|---|
| Tensile Strength | 280–320 MPa |
| Yield Strength | 180–220 MPa |
| Elongation | 8–14% |
| Hardness | 65–85 HB |
| Elastic Modulus | 45 GPa |
H24 Temper
| Property | Value |
|---|---|
| Tensile Strength | 310–350 MPa |
| Yield Strength | 220–260 MPa |
| Elongation | 6–10% |
Physical Properties
| Property | Value |
|---|---|
| Density | 1.81 g/cm³ |
| Melting Point | 525–635°C |
| Thermal Conductivity | 72 W/m·K |
| Electrical Conductivity | 21% IACS |
| Electrical Resistivity | 0.082 μΩ·m |
| Thermal Expansion Coefficient | 26 × 10⁻⁶/K |
| Specific Heat Capacity | 1020 J/kg·K |
Strength-to-Weight Ratio
| Material | Density (g/cm³) | Tensile Strength |
|---|---|---|
| AZ61A Magnesium | 1.81 | 320 MPa |
| AZ31B Magnesium | 1.77 | 260 MPa |
| Aluminum 6061-T6 | 2.70 | 310 MPa |
| Titanium Grade 2 | 4.51 | 345 MPa |
AZ61A offers significantly higher strength than AZ31B while maintaining extremely low weight.
Corrosion Resistance
| Environment | Performance |
|---|---|
| Indoor Environment | Good |
| Dry Atmosphere | Good |
| Fresh Water | Fair |
| Marine Atmosphere | Moderate |
| Salt Water | Poor |
| Industrial Environment | Fair |
Protective coatings are generally recommended for outdoor or corrosive environments.
Recommended surface treatments:
- Chromate Conversion Coating
- Anodizing
- Powder Coating
- Electroplating
- Ceramic Coating
- Painting
Vibration Damping Performance
| Property | Rating |
|---|---|
| Vibration Absorption | Outstanding |
| Noise Reduction | Excellent |
| Shock Absorption | Excellent |
AZ61A maintains the superior vibration damping characteristics typical of magnesium alloys.
Wear Resistance
| Property | Performance |
|---|---|
| Abrasion Resistance | Good |
| Sliding Wear Resistance | Good |
| Impact Resistance | Good |
| Fatigue Resistance | Very Good |
The higher aluminum content improves wear resistance compared with AZ31B.
Weldability
| Welding Process | Rating |
|---|---|
| TIG Welding | Good |
| MIG Welding | Good |
| Resistance Welding | Good |
| Laser Welding | Good |
Proper shielding and cleaning procedures are required when welding magnesium alloys.
Machinability
| Process | Rating |
|---|---|
| CNC Turning | Excellent |
| CNC Milling | Excellent |
| Drilling | Excellent |
| Tapping | Excellent |
| Grinding | Good |
Machinability Comparison
| Material | Machinability |
|---|---|
| AZ61A Magnesium | Excellent |
| AZ31B Magnesium | Excellent |
| Aluminum 6061 | Excellent |
| Titanium Grade 5 | Moderate |
| Stainless Steel 304 | Moderate |
AZ61A machines easily with high cutting speeds and low tool wear.
Heat Treatment
Stress Relief
| Parameter | Value |
|---|---|
| Temperature | 150–260°C |
| Cooling Method | Air Cool |
Annealing
| Parameter | Value |
|---|---|
| Temperature | 345–415°C |
| Cooling Method | Air Cool |
Heat Treatability
| Property | Performance |
|---|---|
| Heat Treat Hardening | Limited |
| Annealing Response | Excellent |
| Work Hardening | Good |
AZ61A gains strength primarily through alloying and cold working.
International Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM (USA) | AZ61A |
| UNS | M11610 |
| AMS | AMS 4386 |
| EN (Europe) | MgAl6Zn1 |
| DIN (Germany) | 3.3535 |
| ISO | AZ61A |
| JIS (Japan) | AZ61A |
| GB/T (China) | MB6 |
Available Forms
| Product Type | Availability |
|---|---|
| Sheet | Yes |
| Plate | Yes |
| Round Bar | Yes |
| Flat Bar | Yes |
| Extrusions | Yes |
| Forgings | Yes |
| Rod | Yes |
Typical Applications
Aerospace Industry
- Aircraft Interior Structures
- Lightweight Brackets
- Aerospace Panels
- Structural Components
Automotive Industry
- Chassis Components
- Seat Frames
- Steering Parts
- Lightweight Structures
Defense Industry
- Portable Equipment
- Military Electronics
- Lightweight Structural Assemblies
Electronics Industry
- Device Housings
- Equipment Frames
- Precision Enclosures
Sporting Goods
- Bicycle Components
- Racing Equipment
- Lightweight Performance Products
Industrial Applications
- Precision Machinery Parts
- Lightweight Fixtures
- Structural Components
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| CNC Machining | Outstanding |
| Forming | Good |
| Forging | Excellent |
| Welding | Good |
| Extrusion | Excellent |
| Surface Finishing | Excellent |
Advantages
Extremely Lightweight
Approximately 33% lighter than aluminum and 77% lighter than steel.
Higher Strength Than AZ31B
Improved mechanical performance for structural applications.
Excellent Machinability
Allows high-speed precision machining.
Outstanding Vibration Damping
Superior noise and vibration reduction characteristics.
Good Fatigue Resistance
Suitable for cyclic-loading applications.
Excellent Strength-to-Weight Ratio
Ideal for lightweight engineering designs.
Limitations
Moderate Corrosion Resistance
Requires protective coatings for harsh environments.
Lower Strength Than AZ80A
Not the highest-strength magnesium alloy available.
Flammability During Machining
Proper safety procedures are required.
Limited High-Temperature Capability
Not recommended for elevated-temperature structural service.
Comparison with Other Magnesium Alloys
| Property | AZ61A | AZ31B | AZ80A |
|---|---|---|---|
| Strength | Higher | Moderate | Highest |
| Formability | Good | Excellent | Moderate |
| Weldability | Good | Good | Fair |
| Machinability | Excellent | Excellent | Good |
| Fatigue Resistance | Very Good | Good | Excellent |
Comparison with Common Lightweight Materials
| Material | Density | Tensile Strength | Machinability |
|---|---|---|---|
| AZ61A Magnesium | 1.81 g/cm³ | 320 MPa | Excellent |
| AZ31B Magnesium | 1.77 g/cm³ | 260 MPa | Excellent |
| Aluminum 6061-T6 | 2.70 g/cm³ | 310 MPa | Excellent |
| Titanium Grade 2 | 4.51 g/cm³ | 345 MPa | Moderate |
Available Surface Finishes
Raw Finishes
- Mill Finish
- Annealed Finish
Functional Finishes
- Precision Machined Finish
- Brushed Finish
- Polished Finish
Protective Finishes
- Anodized Finish
- Chromate Conversion Coating
- Powder Coating
- Painted Finish
Frequently Asked Questions (FAQ)
What is AZ61A magnesium alloy?
AZ61A is a magnesium alloy containing approximately 6% aluminum and 1% zinc, designed for lightweight structural applications requiring higher strength than AZ31B.
What is AZ61A used for?
Typical applications include:
- Aerospace Components
- Automotive Parts
- Defense Equipment
- Sporting Goods
- Electronic Housings
What is the equivalent material to AZ61A?
Common equivalents include:
- UNS M11610
- AMS 4386
- MgAl6Zn1
- MB6
What is the difference between AZ61A and AZ31B?
| Property | AZ61A | AZ31B |
|---|---|---|
| Strength | Higher | Lower |
| Hardness | Higher | Lower |
| Formability | Slightly Lower | Better |
| Weight | Similar | Similar |
Is AZ61A corrosion resistant?
AZ61A offers moderate corrosion resistance and generally requires protective coatings for outdoor service.
Can AZ61A be welded?
Yes. AZ61A can be welded using TIG, MIG, and laser welding processes.
Why choose AZ61A magnesium?
Because it combines:
- Extremely Low Weight
- Higher Strength Than AZ31B
- Excellent Machinability
- Outstanding Vibration Damping
- Good Fatigue Resistance
Is AZ61A suitable for aerospace applications?
Yes. AZ61A is widely used in aerospace structures and lightweight assemblies.
Does GCNOV provide custom manufacturing services for AZ61A magnesium?
Yes. GCNOV provides:
- CNC Machining
- Precision Milling
- Magnesium Fabrication
- Surface Finishing
- Prototype Development
- Low-Volume Production
- Mass Production
- Custom Lightweight Components