The material and its properties Magnesium Diecasting Diecasting magnesium alloys: The material and its properties

Magnesium alloys for diecasting make it possible to produce EN-MB MgAl9Zn1(A) (AZ 91) EN-MB MgAl5Mn (AM 50) and EN-MB MgAl6Mn (AM 60) EN-MB MgAl2Mn (AM 20) components with low weight at competitive manufacturing costs. Thin walls, dimensional accuracy, short casting cycles The most common diecasting alloy with outstanding casting This alloy is characterized by particularly high elongation and High elongation combined with high impact strength is char- and a long die service life are typical advantages of magne- properties and high mechanical strength. Typical applications: energy absorption with high mechanical strength and good acteristic of this alloy. It is therefore typically used for safety sium diecastings. Further advantages include the excellent automotive parts, computer components, parts for mobile casting properties. Typical applications are to be found in components in motor vehicles. machinability, good attenuation and (EMI) shielding properties. phones, sports equipment, covers and housings, components automotive engineering: seat frames, steering wheels, dash- High purity and advanced corrosion-proofing techniques allow for chainsaws, manual tools, household appliances, etc. board supports, fanwheels, etc. our diecasting alloys to be used in corrosive environments, too.

Composition of pigs for diecasting magnesium Diecast parts The material and its properties Alloy % Al % Mn % Zn % Si % Cu % Ni % Fe Others Alloy % Al % Mn % Zn % Si % Cu % Ni % Fe Others (max) (max) (max) (max) (max) max % each (max) (max) (max) (max) (max) max % each

EN-MB MgAl9Zn1(A) EN-MB 21120 8.5-9.5 min. 0.17 0.45-0.90 0.05 0.025 0.001 0.004 0.01 EN-MC MgAl9Zn1(A) EN-MC 21120 8.3-9.7 min 0.10 0.35-1.00 0.10 0.030 0.002 0.005 0.01

EN-MB MgAl6Mn EN-MB 21230 5.6-6.4 min. 0.23 max. 0.20 0.05 0.008 0.001 0.004 0.01 EN-MC MgAl6Mn EN-MC 21230 5.5-6.5 min 0.10 max. 0.20 0.10 0.010 0.002 0.005 0.01

EN-MB MgAl5Mn EN-MB 21220 4.5-5.3 min. 0.27 max. 0.20 0.05 0.008 0.001 0.004 0.01 EN-MC MgAl5Mn EN-MC 21220 4.4-5.5 min 0.10 max. 0.20 0.10 0.010 0.002 0.005 0.01

EN-MB MgAl2Mn EN-MB 21210 1.7-2.5 min. 0.35 max. 0.20 0.05 0.008 0.001 0.004 0.01 EN-MC MgAl2Mn EN-MC 21210 1.6-2.6 min 0.10 max. 0.20 0.10 0.010 0.002 0.005 0.01

Characteristic mechanical properties (at room temperature) The values apply for test bars cast separately Characteristic physical properties

Properties Unit EN-MC MgAl9Zn1(A) EN-MC MgAl6Mn EN-MC MgAl5Mn EN-MC MgAl2Mn Properties Unit Temp.°C EN-MC MgAl9Zn1(A) EN-MC MgAl6Mn EN-MC MgAl5Mn EN-MC MgAl2Mn (AZ 91) (AM 60) (AM 50) (AM 20) (AZ 91) (AM 60) (AM 50) (AM 20)

Tensile strength N/mm2 200 - 260 190 - 250 180 - 230 150 - 220 Density g/cm3 20 1.81 1.80 1.77 1.75

0.2 % proof stress N/mm2 140 - 170 120 - 150 110 - 130 80 - 100 Liquidus temperature °C 598 615 620 638

Compression strength N/mm2 148 nm 113 74 Initial melting temperature °C 420-435 420-435 420-435 420-435 Coefficient Elongation at rupture % 1 - 6 4 - 14 5 - 15 8 - 18 of thermal expansion µm/m·K 20-100 26.0 26.0 26.0 26.0 Modulus of elasticity kN/mm2 45 45 45 45 Heat of fusion kJ/kg 370 370 370 370

Shear modulus kN/mm2 17 nm nm nm Spec. thermal capacity kJ/kg·K 20 1.02 1.02 1.02 1.02

Brinell hardness HBS 1/5 65 - 85 55 - 70 50 - 65 40 - 55 Thermal conductivity W/K·m 20 51 61 65 94

Impact strength acc. to J 6 17 18 18 Electrical conductivity MS/m 20 6.6 nm 9.1 13.1 Charpy, without notch

nm: not measured nm: not measured

The mechanical properties of an alloy depend very largely on the production method used and its variables. The information and specifications can be found in: DIN EN 1753 and ASTM standards. STIHL cannot accept any warranty or liability for the information contained in this brochure, which has been compiled to the best of our knowledge and belief. Subject to printing errors.

26 27 Diecasting magnesium alloys The material and its properties

Stress-strain curves Tensile strength Impact test on test bars Creep of diecasting alloys for diecasting magnesium alloys of diecasting magnesium alloys without notch at room temperature at 100°C and 50 MPa

300 300 8 0.4 MgAl9Zn1(A) MgAl4Si MgAl6Mn MgAl9Zn1(A) MgAl2Si Separately cast test bars Separately cast test bars MgAl9Zn1(A) MgAl6Mn

6 0.3 200 200 MgAl5Mn MgAl2Mn MgAl5Mn 4 0.2 MgAl2Si MgAl2Mn

100 100 MgAl2Mn MgAl2Si 2 0.1 Test bars cast separately The arrows indicate the respective Test bars cast separately MgAl6Mn Alloys: MgAl9Zn1(A), MgAl4Si, MgAl2Si MgAl4Si at room temperature elongation limits at room temperature The material and its properties Creep (%) Stress (MPa) 0 strength (MPa) Tensile 0 Measured load (kN) 0 0 048121620 -50 0 100 150 200 0 0.4 0.8 1.2 1.6 2 0 20 40 60 80 100 Strain (%) Temperature (°C) Test duration (1/1000 seconds) Time (h)

0.2 % proof stress Impact strength Creep of diecasting alloys Salt spray test for corrosion resistance of diecasting magnesium alloys of diecasting magnesium alloys at 150°C and 50 MPa of diecasting alloys (ASTM B117)

200 1.0 1.6 MgAl9Zn1(A) MgAl9Zn1(A) Separately cast test bars Separately cast test bars 6 1.4 with notch (Charpy-V) 0.8 150 1.2 MgAl6Mn MgAl6Mn MgAl2Mn MgAl5Mn 1.0 4 0.6 · per day) 2 100 0.8 MgAl2Mn 0.4 MgAl4Si 0.6 MgAl2Si 2 50 MgAl4Si 0.4 Test bars cast separately MgAl2Si 0.2 at room temperature MgAl9Zn1(A) 0.2 MgAl4Si MgAl2Si Elongation limit (MPa) Creep (%) Impact strength (J) 0 0 0 Rate of corrosion (mg/cm 0 -50 0 50 100 150 200 -60 -30 0 30 60 90 120 150 180 0 20 40 60 80 100 MgAl9Zn1(A) MgAl6Mn MgAl5Mn MgAl2Mn MgAl2Si Temperature (°C) Temperature (°C) Time (h)

STIHL cannot accept any warranty or liability for the information contained in this brochure, which has been compiled to the best of our knowledge and belief. Subject to printing errors.

28 29 Do you have more questions?

STIHL Magnesium Diecasting is your competent source of comple- te solutions cast-in-one.

ANDREAS STIHL AG & Co. KG Andreas-Stihl-Straße 54595 Prüm-Weinsheim Germany

You can contact us also by telephone (Your contact person is Mrs. Richards-Hebben): Phone: +49 (0) 65 51 13-4123 Fax: +49 (0) 65 51 13-1109 or you can write an email to: [email protected]

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