Jul 29 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Applications
Introduction
Magnesium AZ31B-O alloy is available in the form of annealed sheets. This datasheet will elaborate on the properties and applications of this alloy.
Chemical Composition
The following table provides the chemical composition of magnesium AZ31B-O alloy.
Element |
Content (%) |
Magnesium, Mg |
97 |
Aluminum, Al |
2.5-3.5 |
Zinc, Zn |
0.60-1.4 |
Manganese, Mn |
≥0.20 |
Silicon, Si |
≤0.10 |
Copper, Cu |
≤0.050 |
Calcium, Ca |
≤0.040 |
Iron, Fe |
≤0.0050 |
Nickel, Ni |
≤0.0050 |
Physical Properties
The physical properties of magnesium AZ31B-O alloy are given in the following table.
Properties |
Metric |
Imperial |
Density |
1.77 g/cc |
0.0639 lb/in³ |
Melting Point |
605-630°C |
1120-1170°F |
Mechanical Properties
The mechanical properties of magnesium AZ31B-O alloy are listed in the table below.
Properties |
Metric |
Imperial |
Tensile Strength |
255 MPa |
37000 psi |
Yield strength (@strain 0.200%) |
150 MPa |
21800 psi |
Compressive Yield Strength (at 0.2% offset) |
110 MPa |
16000 psi |
Ultimate Bearing Strength |
485 MPa |
70300 psi |
Bearing Yield Strength |
290 MPa |
42100 psi |
Elongation at break (in 50 mm) |
21% |
21% |
Elastic Modulus (in tension) |
45 GPa |
6530 ksi |
Poisson's ratio |
0.35 |
0.35 |
Shear Modulus |
17 GPa |
2470 ksi |
Shear Strength |
145 MPa |
21000 psi |
Machinability (relative rating, 100=Best) |
100 |
100 |
Hardness, Brinell (500 kg load, 10 mm ball) |
56 |
56 |
Hardness, Knoop (estimated from Brinell) |
71 |
71 |
Hardness, Vickers (estimated from Brinell) |
83 |
83 |
Thermal Properties
The following table outlines the thermal properties of magnesium AZ31B-O alloy.
Properties |
Metric |
Imperial |
Thermal expansion co-efficient (@ 0.000-100°C/32-212°F) |
26 µm/m°C |
14.4 µin/in°F |
Thermal Conductivity |
96 W/mK |
666 BTU in/hr.ft².°F |
Other Designations
Some of the other designations that are used to denote magnesium AZ31B-O alloy are:-
Applications
Magnesium AZ31B-O alloy is used in aircraft fuselage, cell phones and camera cases, textile machinery and concrete tools.