DE1053792B - Alloys of magnesium with rare earth metals - Google Patents

Description

GERMAN

Alloys of magnesium with rare earth metals are known to be useful in terms of can coordinate their behavior under heat excellently.

In-depth studies of the specific properties of the various rare earth metals have led to the realization that among the alloys of magnesium with rare earth metals, the magnesium-didymium alloy is the best mechanical Has properties in cold and warm (up to approx. 250 ° C) state. The Didym salary should about 2 to 6%, preferably 4%.

It has now been found according to the invention that the mechanical properties at elevated temperature strongly depend on the lanthanum content of the rare earth metals used. For example, a lanthanum content improves from 5 to 15% in the Didym used - corresponding to a lanthanum content of 0.2 to 0.6% in an alloy with 4% rare earth metals - the creep resistance.

One should therefore assume that a greater lanthanum content in magnesium-lanthanum alloys gives very good warming properties. If the temperature is actually the properties little influenced, they are unfavorable in such alloys even at ordinary temperature. if One, however, a special mixture of rare earth metals, which at the same time for good mechanical properties enough lanthanum when heated (i.e. up to about 300 ° C) and more sufficient to ensure it mechanical properties at normal temperature contains sufficient didymium, produces, then gets you surprisingly find a good solution to the above difficulties.

The investigations have shown that alloys of magnesium with rare earth metals, in which the added rare earth metals from a mixture of about 20 to 75% lanthanum, 10 to 50% Neodymium, 5 to 15% praseodymium and 1 to 17% samarium exist, both in heat and in cold behave well. The cerium present in such alloys is said to be 10% of the weight of the rare ones Do not exceed earth metals and the alloy's rare earth metals total 2 'to 6 percent by weight contain.

Very good results were especially achieved with the addition of rare earth metals in the following composition achieved:

Praseodymium 6 to 10%

Samarium 10 to 12%

Lanthanum 30 to 40%

Cerium 4%

Rest: neodymium 35 to 50%

Alloys of magnesium
with rare earth metals

Applicant:

Societe d'Inventions Aeronautiques

et Mecaniques S. I. A. M., Freiburg

(Switzerland)

Representative: Dipl.-Ing. H. Kosel, patent attorney, Bad Gandersheim, Braunschweiger Str. 22

Claimed priority:
France of November 7, 1953 and August 12, 1954

Rene Lucien, Paris,
and Emil Tetart, Louvie-Juzon, Basses Pyrenees

(France),
have been named as inventors

One has to choose between the composition of the rare earth metals at the moment of their admixture differ from magnesium and the composition in the finally obtained alloy. The reduction of the salts of the rare earths by the magnesium has with the various rare earths Different yields of earth metals.

In general, neodymium, praseodymium and cerium are best, and lanthanum is somewhat worse and that of samarium worst, so an alloy with rare earth metals in the above specified mixing ratio in their final composition with regard to the content of rare Earth metals can show the following fluctuations:

Praseodymium 8 to 12%

Samarium 0.5%

Lanthanum 25 to 35%

Cerium 2 to 10%

Remainder: Neodvm 42.5 to 65%

Claims (1)

Claim: Alloys made from 2 to 6% rare earth metals, the remainder being magnesium, 809 787/486 ftfetf 3 4 indicates that the rare earth metals in the documents considered: finished alloy of 8 to 12% praseodymium, German Patent No. 806 055; 0.5% samarium, 25 to 35% lanthanum, 2 to British Patent No. 679,746; 10% cerium, balance 42.5 to 65% neodymium from The Ivon Age, May 22, 52, p. 135; are composed. 5 The Engineer, Vol. 189 (1950), I, p. 240. ι 809 787/486 3. 59