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Патент USA US2124554

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2,134,554
total added metals, but where the alloy is to be heating at 175° C., subsequent to the above solu
tion heat treatment. Plastic deformation opera
used for the production of wrought shapes gen
tions, such as extruding, forging, and rolling are
erally, suitable compositions are those contain
ing more than 90 per cent of magnesium and less best conducted at temperatures between 300° and
than 10 per cent of total added metals. For the 400° C.
Other modes of applying the principle of my
production of castings, the alloy should preferably
contain 85 to 92 per cent of magnesium and the invention may be employed instead of those ex
plained, change being made as regards the ‘in
various alloying ingredients in the following pro
portions: 4 to 10 per cent of aluminum, 2 to 8 per gredients and the steps herein disclosed, , pro
10 cent of cadmium, 1 to 6 per cent of lead, 1 to 6 ‘ vided those stated by any of the following claims 10
per cent of tin, and 1 to 4 per cent of zinc. or their equivalent be employed.
I particularly point out and distinctly claim as
For the production of ‘wrought shapes by extru
my invention:
sion and forging, the alloy should preferably con
1. A magnesium-base alloy containing from
tain 90 to 96 per cent of magnesium and the vari
approximately
1 to 12 per cent of aluminum, 15
ous
alloying
ingredients
in
the
following
propor
15
tions: 1 to 8 per cent of aluminum, 1 to 3 per cent
of cadmium, 0.5 to 2 per cent of lead, 0.5 to 3 per
cent‘ of tin, and 0.5 to 2 per cent of zinc. If the
alloy is to be fabricated by rolling rather than by
20 extrusion or forging, the percentage of aluminum
should preferably lie within the range of 1 to 45
per cent.
,
1
Mynew polynary alloys may be prepared by the
methods usually employed for melting and alloy
,25 ing metals with magnesium, such as adding the
respective alloying metals singly or jointly to a
bath- of molten magnesium protected from oxida
tion by a cover of ?uid ?ux. -The solution heat
treatment for the zinc-free alloys may consist in
80 heating the material for 20 hours at 430° C., fol
lowed by air cooling, or, when zinc is present in
the alloy, 12 hours at 320° 0. plus 16 hours at
420° C., followed by air cooling. The aging
treatment consists of approximately 16 hours
and from about 1 to 10 per cent of cadmium, and
from about 0.5 to 10 per cent of lead, the balance
being magnesium.
.
2. A magnesium-base alloy consisting of from
about 4 to 10 per cent of aluminum, and from 20
about 2 to 8 per cent of cadmium, and from
about 1 to 6 per cent of lead, the balance being
magnesium.
~
3.'A magnesium-base alloy consisting of from
about 1 to 8 per cent of aluminum, and from about
1 to 3 per cent of cadmium, and from about 0.5 to
2 per cent of lead, and from about 90 to 96 per
cent of magnesium.
4. A magnesium-base alloy consisting of about
4 per cent of aluminum, and of about 4 per cent
of cadmium, and of about 2 per cent of lead, the
balance being magnesium.
' -
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