Magnesium AZ31B-F Alloy (UNS M11311)

Jul 29 2013

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties

Introduction

Magnesium alloys are easy to machine and are very lightweight. When magnesium is alloyed with other metals such as aluminum, zinc, silicon, and iron, magnesium alloys are derived. Magnesium AZ31B-F alloy is a medium strength alloy.

The following sections will discuss in detail about magnesium AZ31B-F alloy.

Chemical Composition

The chemical composition of magnesium AZ31B-F alloy is outlined in the following table.

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-F alloy are tabulated below.

Properties Metric Imperial
Density 1.77 g/cm3 0.0639 lb/in3
Melting point 605 - 630°C 1120 - 1170°F

Mechanical Properties

The following table shows mechanical properties of magnesium AZ31B-F alloy.

Properties Metric Imperial
Tensile strength 260 MPa 37700 psi
Yield strength 200 MPa 29000 psi
Poisson’s ratio 0.35 0.35
Elastic modulus 45 GPa 6526 ksi
Shear strength 130 MPa 18 ksi
Elongation at break 15% 15%
Hardness, Brinell 49 49

Thermal Properties

The thermal properties of magnesium AZ31B-F alloy are tabulated below.

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

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