AZ91D

Alloy AZ91D is the most widely used magnesium die cast alloy and has an excellent combination of mechanical properties, corrosion resistance, and castability.
  • Corrosion resistance is achieved by enforcing very strict limits on three metallic impurities—iron, copper and nickel. These are limited to very low levels making it necessary to use primary magnesium in the production of this alloy
  • As with all magnesium alloys, special precautions must be taken when machining

Working with AZ91D

  • Designers of structural components must be aware of the creep limitations of magnesium alloys—generally with increasing temperature, the tensile strength, yield strength, and hardness of magnesium alloys decreases, while ductility increases
  • In addition to environmental effects, there is a change in the metallurgical structure of magnesium over a period of time, and/or at elevated temperatures, that affects the mechanical properties
  • This aging effect arises from the fact that the castings are produced under rapid solidification conditions which don’t allow the alloy to reach equilibrium (effectively, reactions between the alloy constituents have not been completed)
  • Because creep is an important consideration in magnesium parts for elevated temperature use, stresses and times of operations should be known for both peak and normal conditions

Mechanical Properties

Material Alloy Elongation   Tensile Strength   Yield Strength (0.2%)   Impact Strength   Shear Strength   Hardness   Process
% in 50mm
PSI x 103
PSI x 103
ft lb
PSI x 103
布氏硬度 (HB)
Magnesium Casting Metals
3
34
23
2
20
63

Physical Properties

Material Alloy Density   Melting Point (Average +/- 50)   Thermal Conductivity   Coefficient of Thermal Expansion   Electrical Conductivity   Process
lb/in3
°F
BTU/h∙ft∙°F
µin/in°F
%IACS
Magnesium Casting Metals
0.066
990
41.8
14.0
12.2

Composition

Magnesium Casting Metals
% AZ91D
Aluminum 8.3-9.7
Copper 0.03 max
Magnesium Bal.
Iron (max) 0.005
Lead (max)
Cadmium (max)
Tin (max)
Nickel (max) 0.002
Zinc 0.35-1.0
Manganese 0.15-0.5
Silicon 0.1 max
Other-Metallic 0.02
RoHS Compliant

 

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Last updated 12.23.2019