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  • Name: Forged magnesium alloy block
  • Number: 0012
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XYMCO started to produce the forged magnesium alloy blocks and billet from 2004.

 

AZ31B is a wrought magnesium base alloy with good room-temperature strength and ductility combined with corrosion resistance and weldability. Increased strength is obtained by strain hardening with a subsequent partial anneal (H24 and H26 tempers).

 

AZ80A is the strongest of the AZ alloy family, offering good strength at ambient or medium temperatures up to 120˚C (250˚f). It has good corrosion resistance and can be forged for good properties. Recent improvements on microstructure and cleanliness makes our AZ80 ideal for high-performance forging applications.

 

ZK60A is the typical legacy magnesium forging alloy.  Current and historic uses are in military rotor and aircraft while the largest volume application is forged magnesium wheels for motorsport. This high strength alloy has good corrosion resistance but requires a coating for all applications.

 

Max. dimension:

For blocks: 350mm x 500mm x 500mm

For billet: Dia. 350 x 1000mm

 

SPECIFICATIONS

Available alloys: AZ31B, AZ61, AZ80 and ZK60A

Specification: ASTM B91-97 and GB standard

 

PHYSICAL PROPERTIES

Density: 1.78

Coefficient of thermal expansion: 26.8 x 10-6K-1

Specific heat: 1040 Jkg-1k-1

Thermal conductivity: 76.9Wm-1k-1

Electrical resistivity: 92nΩm

Modulus of elasticity: 45 x 109Pa

Poissons ratio: 0.35

Melting range: 566 - 632°C

 

HEAT TREATMENT

No thermal treatment is available for increasing the strength of this alloy after fabrication.

 

MECHANICAL PROPERTIES

 

Alloy and Temper

Thickness (mm)

Yield Strength

0.2% offset (MPa)

Tensile strength

(MPa)

Elongation

In 5.65 √A (%)

AZ31B-O

0.5 – 1.5

125

221

10

1.5 – 6.3

105

221

9

6.3 - 75

105

221

8

AZ31B-H24

0.5 – 6.3

200

269

5

6.3 -9.5

179

262

7

9.5 – 12.7

165

255

8

12.7 - 25

152

248

8

25- 50

138

234

6

50 - 80

124

234

7

AZ31B-H26

6.3 - 10

186

269

6

10 – 12.5

179

262

6

12.5 - 20

172

255

5

20 – 25

159

255

5

25 - 40

152

241

5

40 - 50

148

241

5

The sheet and plate shall conform to the tensile requirements in above Table unless other agreement is made between seller and purchaser. Mechanical Properties for sizes and tempers not shown in above Table shall be as agreed upon by seller and purchaser.

 

OTHER PROPERTIES

Typical Hadness

O temper:  67 Rockwell E

H24 temper: 83 Rockwell E

 

WELDABILITY

Excellent weldability with gas shielded arc using AZ61A (preferred) or AZ92A filler rod; post weld stress relief is required to prevent stress corrosion cracking. Resistance welding is excellent.

 

MACHINING

AZ31B, like all magnesium alloy sheet and plate, machines faster than any other metal. Providing the geometry of the part allows, the limiting factor is the power and speed of the machine rather than the quality of the tool material. The power required per cubic centimeter of metal removed varies from 9 to 14 watts per minute depending on machining operation.

 

DENT RESISTANCE

Weight for weight, AZ31B-H24 has proven to be superior to competitive materials in its resistance to denting at moderate energy levels.

Dent Resistance of 1mm Gauge Sheet (Dent depth in mm from 25mm spherical redius indentor on 350mm span)

 

 

 

Impact Energy 0.34 J

Impact Energy 0.62 J

Impact Energy 1.25 J

AZ21B-H24

6061 – T6

3003 – H14

5052 – H34

2024 – T6

SAE 1010 Mild Steel

0.66

0.94

2.24

1.55

0.99

1.09

1.42

1.52

3.23

2.41

1.52

1.70

2.34

2.46

4.90

3.35

2.29

2.67

 

SURFACE TREATMENT

All the normal chromating, anodizing, plating, and finishing treatment are readily applicable. AZ31B also responds well to plasma electrolytic oxidation finishing.

 

CORROSION RESISTANCE

Continuous exposure for 2.5 years.

Marine Atmosphere

AZ31B-H24           0.008mg.cm-2d-1

Mild steel              0.323mg.cm-2d-1

 

Industrial Atmosphere

AZ31B-H24           0.013mg.cm-2d-1

Mild steel              0.055mg.cm-2d-1

 

Rural Atmosphere

AZ31B-H24           0.006mg.cm-2d-1

Mild steel              0.032mg.cm-2d-1