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Magnesium Alloys

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Magnesium Alloys

•Magnesium is one of the lightest elements of density 1,78 g/cm

•It cerystallizes in a hexagonal lattice with c/a = 1.66

• Pure magnesium has a low mechanical properties with UTS

=120 MPa

•Melting temperature 650

o

C

•Large chemical attraction to oxygrn and nitrogen

•Produced in electrolytical way with content of impurities 0.05 and 0.1%

• Up to 2.8% is in solution in see water as dolomite

(CaMg(CO3)2), magnesite (MgCO3) i carnalite (KMgCl3.6H2O).

• It can be found as solid ore in such countries as USA, England, Australia, Russia,Thailand

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Application of magnesium

constructional Die castings

Rolled products

nonconstructional

Alloying addition Al. alloys disulfiding

Cast iron modification spheroidization Reduction of other metals (Ti)

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Phase diagram Mg-Zn Phase diagram Mg-Al

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Magnesium wrought alloys

Stop % Al %Zn %Mn %Th %Zr lub Ca

Rm MPa

A5 [%]

AZ10A 1-1.5 0.2-0.6 0.2 - - 240 10

AZ21 1.6- 2.5

0.8-1.6 0.15 - -

AZ31 2.5- 3.5

0.6-1.4 0.2 - - 290 15

AZ61 5.8- 7.2

0.4-1.5 0.15 - - 305 16

AZ80 7.8- 8.2

0.2-0.8 0.12 - - 338 11

HK31 - 0.3 - 2.5-4 0.4-

1Z

260 23

HM21 - - 0.45-

1.1

1.5-2.5 - 235

M1A - - 1.2 - 0.3

Ca

230 17

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Cytaty

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