Magnesium AZ91D

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.

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Black machined magnesium parts on white background

M11916

63 HB

Brinell Hardness
230 MPa

Ultimate Tensile Strength
160 MPa

Yield Strength(0.2%)
140 MPa

Shear Strength

At a Glance

Material Type
Metal
Material Name
Magnesium AZ91D
Alternative Names
M11916
Process Compatibility
CNC Milling, CNC Turning

Properties Table of Magnesium AZ91D

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

Applications of Magnesium AZ91D

Aerospace components
Automotive parts
Electronic housings
Portable electronic devices
Sporting goods
Medical implants
Marine components
Defense industry applications

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

Raw Stock

CNC Machined

Finished Parts

Magnesium AZ91D — Machining Notes

Magnesium AZ91D in CNC M
is Magnesium AZ91D?

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.

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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.

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FAQ

Does Magnesium AZ91D burn?

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.

Is Magnesium AZ91D magnetic?

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.

Can you laser cut Magnesium AZ91D?

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.

Can Magnesium AZ91D conduct electricity?

Yes, Magnesium AZ91D can conduct electricity. Like many metals, magnesium and its alloys, including AZ91D, are generally good conductors of electricity.