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EN-MCMgAl9Zn1(A) | EN-MC21120 Material Datasheet

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Material Description

Material Number Material Number (single) Standard Scope Standard Status Country Predecessor Successor VDA 231-106 classification
EN-MC21120 (DIN EN 1753 : 1997-08) EN-MC21120 DIN EN 1753 : 1997-08 DIN EN 1753 : 1997-08 replaced by DIN EN 1753 : 2019-12 Replaced Germany G-MgAl9Zn1 EN-MCMgAl9Zn1(A) 2.2 1)
1) Remark: EN-MCMgAl9Zn1(A), trade name AZ 91 is produced as sand, chilled, precision and diecasting. It is an alloy with high tensile strength values and 0,2-proof strength. The material is used for castings of high shape stability and compressive yield point (compression strength) in homogenized and artificial aged condition. The make shows favorable sliding properties and is weldable. Using also for complex die castings with low wall thicknesses and very good strength properties without heat-treatment up to approx. 110°C. The alloy is excellent machinable (regulations of the professional association have to be considered), shows high damping power and no embrittlement at low temperatures. High oxidation tendency of the melted magnesium and of the Mg-chipping requires special measures when melting, casting, trimming and welding. The alloy is also produced as HighPurity (HP)-alloy for application in corrosive environment. Magnesium and its alloys show the easiest machinability of all known construction metals.

Chemical Composition

Al [%] Cu [%] Fe [%] Mn [%] Ni [%] Si [%] Zn [%]
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Mechanical Properties

Casting Method Condition Temperature [°C] Tensile Strength [MPa] Yield Strength (0.2% offset) [MPa] Elongation A [%] Hardness HB | HBW
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Physical Properties

Temperature [°C] Melting Temperature [°C] Density [g/cm³] Young's Modulus [GPa] Mean Coefficient of Thermal Expansion [10^-6*K^-1] Thermal Conductivity [W/(m*K)] Mean Specific Heat Capacity [kJ/(kg*K)] Electric Conductivity [MS/m]
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Toughness Data (Impact)

Temperature [°C] Specimen Shape Notch Impact Energy [J]
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Cross Reference

Material Name Country Standard
EN-MCMgAl9Zn1(A) Europe EN 1753
ML8 Russia GOST 2856
MЛ8 Russia GOST 2856
MLG6 Russia GOST 2856
MЛГ6 Russia GOST 2856
Mg-Al9Zn, No1 International ISO 121
AZ91 USA AMS 4437 1)
AZ91 USA AMS 4446 1)
AZ91 USA AMS 4452 1)
AZ91 USA AMS 4490 1)
B199 Alloy AZ91 USA ASTM B199 1)
B403 Alloy AZ91 USA ASTM B403 1)
B80 Alloy AZ91 USA ASTM B80 1)
B94 Alloy AZ91 USA ASTM B94 1)
AZ91 USA MIL-M-46062B
AZ91 USA QQ-M-38
AZ91 USA SAE J465
M11914 USA UNS
G-MgAl9Zn1 Germany DIN 1729-2
3.5912 Germany DIN 1729-2
G-A9Z1 France
MAG 7 Great Britain
AZ91 Germany 2)
1) Source: Metals & Alloys in the Unified Numbering System, SAE/ASTM, 11th Edition, 2008
2) Source: DIN EN 1753

Producer/Supplier/Trade names

Tradename Supplier
AZ91 ANDREAS STIHL AG & Co.KG, Prüm-Weinsheim
AZ91 gh AUER GUSS GmbH, Amberg
AZ91D ANDREAS STIHL AG & Co.KG, Prüm-Weinsheim
Az91HP ANDREAS STIHL AG & Co.KG, Prüm-Weinsheim
AZ91HP C & C Bark GmbH, Schömberg
GD-MgAl9Zn1 ANDREAS STIHL AG & Co.KG, Prüm-Weinsheim
GD-MgAl9Zn1HP ANDREAS STIHL AG & Co.KG, Prüm-Weinsheim

Material Compliance

REACh RoHS
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Fracture Toughness

Casting Method Condition Temperature [°C] Plane-Strain Fracture Toughness KIc [MPa*m^½]
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