Magnesium ZK60A Alloy (M16600)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Heat Treatment
     Hot Working
     Aging
Applications

Introduction

Magnesium is a silvery-white metal which is used as an alloy element for zinc, lead, aluminum, and other nonferrous alloys. Magnesium alloys are designated using the ASTM and SAE system in which the first part denotes the two main alloying elements in the alloy and the second part represents their percentages. They are light weight and have high machinability. They are anodized to enhance their corrosion resistance property.

Magnesium ZK60A alloy is a heat treatable magnesium alloy. It has higher ductility than magnesium AZ60A alloy.

The following datasheet gives an overview of magnesium ZK60A alloy.

Chemical Composition

The following table shows the chemical composition of magnesium ZK60A alloy.

Element Content (%)
Magnesium, Mg 94
Zinc, Zn 4.80-6.20
Zirconium, Zr ≥ 0.45

Physical Properties

The physical properties of magnesium ZK60A alloy are given in the following table.

Properties Metric Imperial
Density 1.83 g/cm3 0.0661 lb/in³

Mechanical Properties

The mechanical properties of extruded magnesium ZK60A alloy are listed in the following table.

Properties Metric Imperial
Tensile strength 365 MPa 52900 psi
Yield strength (@ strain 0.200%) 305 MPa 44200 psi
Compressive yield strength (at 0.2% offset) 250 MPa 36300 psi
Ultimate bearing strength 585 MPa 84800 psi
Bearing yield strength 405 MPa 58700 psi
Shear strength 180 MPa 26100 psi
Shear modulus (typical for steel) 17 GPa 2470 ksi
Elastic modulus 44.8 GPa 6498 ksi
Poisson's ratio 0.35 0.35
Elongation at break (in 50 mm) 11% 11%
Hardness, Brinell (500 kg load, 10 mm ball) 88 88
Hardness, Knoop (estimated from Brinell) 113 113
Hardness, Rockwell A (estimated from Brinell) 37.5 37.5
Hardness, Rockwell B (estimated from Brinell) 55 55
Hardness, Vickers (estimated from Brinell) 100 100
Machinability (relative rating, 100=best) 100 100

Thermal Properties

The following table outlines the thermal properties of magnesium ZK60A alloy.

Properties Metric Imperial
Thermal expansion co-efficient (@ 0-100°C/32-212°F) 26 µm/m°C 14.4 µin/in°F
Thermal conductivity 120 W/mK 833 BTU in/hr.ft².°F

Other Designations

Other designations that are equivalent to magnesium ZK60A alloy include:

  • ASTM B107
  • ASTM B91

Fabrication and Heat Treatment

Machinability

Magnesium ZK60A alloy has high machinability. It is flammable and a lubricant is used to perform this operation. The machinist is required to constantly monitor the operation with a magnesium fire arresting kit.

Forming

Magnesium ZK60A alloy can be formed by preheating at 260°C (500°F).

Welding

Magnesium ZK60A alloy can be welded using resistance welding method. Arc welding method is not preferred for welding this alloy.

Heat Treatment

Magnesium ZK60A alloy is heat treated at 499°C (930°F) for 2 h followed by quenching in hot or warm water.

Hot Working

Magnesium ZK60A alloy can be hot worked at 260°C (500°F).

Aging

Magnesium ZK60A alloy is aged at 149°C (300°F) for 24 h.

Applications

Magnesium ZK60A alloy is used in different aircraft applications such as brake housings, instrumentation bodies, landing gear, ribs and spars.

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