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Magnesium AZ91D
Material Type
Metal
Material Name
Magnesium AZ91D
Alternative Names
M11916
Process Compatibility
CNC Milling, CNC Turning, Die Casting
introduction
Magnesium AZ91D in CNC Machining
Magnesium AZ91D is a high-purity magnesium die-casting alloy that offers a good balance of strength and weight, providing strength comparable to many aluminum alloys.
The alloy is named based on its composition, with "AZ" indicating the presence of aluminum and zinc and "91" specifying the approximate percentages of these elements in the alloy. In the case of AZ91D, it typically contains around 9% aluminum and 1% zinc. The letter "D" indicates that the alloy is suitable for die casting. AZ91D possesses moderately low tensile strength, electrical conductivity, and melting temperature compared to other magnesium alloys. The material has three common variations – AZ91D-F, AZ91D-T6, and AZ91D-T4.
It is well known for being highly corrosion-resistant and having good thermal conductivity. AZ91D is generally softer than aluminum or steel, making it easier to machine. However, this also means that special care must be taken to avoid machining-induced deformation or burrs. Additionally, it is highly flammable, and the chips produced during machining can be a fire hazard. We use water-soluble coolants to keep temperatures in check. Moreover, we choose coated carbide tools in machining for efficient results.
Properties
Properties Table of Magnesium AZ91D
| MECHANICAL PROPERTIES | |
|---|---|
| Brinell Hardness | 63 HB |
| Ultimate Tensile Strength | 230 MPa |
| Yield Strength(0.2%) | 160 MPa |
| Shear Strength | 140 MPa |
| Fatigue Strength | 97 MPa |
| Impact Strength | 3.0 J |
| Modulus of Elasticity | 44.8 GPa |
| Elongation | 3.0 % in 50mm |
| Physical Properties | |
| Melting Point(Avg.) | 533°C |
| Density | 1.81 g/cm³ |
| Electrical Conductivity | 12.2% IACS |
| Electrical Resistivity | 14.3 μΩ-cm |
| Thermal Conductivity | 72 W/mK |
| Casting Temperature | 640-675°C |
| Specific Heat Capacity | 1047 J/kg-°C |
| Coefficient of Thermal Expansion | 25.2 μm/m°K |
TECHNOLOGY OVERVIEW
Basic Knowledge of Magnesium AZ91D
What is Magnesium AZ91D?
Magnesium is one of the lightest structural metals. Magnesium AZ91D is a wrought magnesium alloy with a specific composition, primarily composed of magnesium (Mg), aluminum (Al), and zinc (Zn). AZ91D, known for its high purity, overcomes magnesium's natural corrosion weakness by including aluminum and carefully controlling iron, nickel, and copper percentages.
Due to its corrosion resistance, it can be an effective alternative to aluminum die-casting alloys in certain situations. The alloy shares characteristics with pure magnesium, such as lower density than aluminum and zinc. However, it also exhibits lower thermal conductivity and a higher material cost. It may justify the added expense if you specifically need a lightweight material.
Advantages of Magnesium AZ91D
Lightweight
Good strength-to-weight ratio
High corrosion resistance
Excellent machinability
Good heat dissipation
Suitable for die-casting applications
Cost-effective
Recyclable
Applications of Magnesium AZ91D
Aerospace components
Automotive parts
Electronic housings
Portable electronic devices
Sporting goods
Medical implants
Marine components
Defense industry applications
FAQ
Machining Magnesium AZ91D Buying FAQ
Magnesium AZ91D is highly flammable and can catch fire easily. However, it doesn't burn traditionally like wood or paper. Instead, it undergoes a combustion reaction when exposed to a sufficient heat source, oxygen, and an ignition source. Handling and machining magnesium alloys with care is important to avoid fire risk.
No, Magnesium AZ91D is not magnetic. It is a non-ferrous metal, which means it does not contain iron and is not attracted to magnets.
Laser-cutting magnesium alloys, including AZ91D, can be challenging due to their high reflectivity and thermal conductivity. However, it is possible with specialized laser cutting equipment designed for working with reflective materials.
Yes, Magnesium AZ91D can conduct electricity. Like many metals, magnesium and its alloys, including AZ91D, are generally good conductors of electricity.
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