Magnesium alloy and the respective manufacturing method
A magnesium alloy, comprising: Y: 0.5-10 Zn: 0.5-6 Ca: 0.05-1 Mn: 0-0.5 Ag: 0-1 Ce: 0-1 Zr: 0-1 or Si: 0-0.4, wherein the amounts are based on weight-percent of the alloy and Mg, and manufacturing-related impurities constitute the remainder of the alloy to a total of 100 weight-percent. Also disclosed is a method for manufacturing such an alloy and a biodegradable implant formed therefrom.
1. A magnesium alloy, consisting of:
Y:
0.5-10
weight-percent,
Zn:
0.5-6
weight-percent,
Ca:
0.05-1
weight-percent,
Mn:
0-0.5
weight-percent,
Ag:
0-1
weight-percent,
Ce:
0-1
weight-percent,
Zr:
0-1 weight-percent or
Si: 0-0.4 weight-percent,
wherein the amounts are based on weight-percent of the alloy and Mg and manufacturing-related impurities constitute the remainder of the alloy to a total of 100 weight-percent,
wherein the magnesium alloy has a monophasic structure,
wherein the magnesium alloy has an effective amount of one or more intermetallic phases having a volume amount of less than about 3 vol. % to produce an alloy having a grain size of less than about 20 μm, and
wherein the grain size of the intermetallic phases is less than about 3 μm.
2. The magnesium alloy of claim 1 , wherein the magnesium alloy comprises one or more intermetallic phases comprising:
(a) Mg and one or more elements selected from the group consisting of Zn, Ca, Mn, Ag, Ce, Zr, Si and Y; or
(b) two or more elements selected from the group consisting of Zn, Ca, Mn, Ag, Ce, Zr, Si and Y.
3. The magnesium alloy of claim 2 , comprising one or more intermetallic phases selected from the group consisting of Ca 2 Mg 6 Zn 3 , AgMg 4 , Mn 2 Zr, ZnZr, Zn 2 Zr, MgZn, MgZn 2 , Mg 2 Si, Mg 3 Y 2 Zn 3 , Mg 3 YZn 6 , Mg 12 YZn and Mg 24 Y 5 .
4. The magnesium alloy of claim 1 , wherein the amount by volume of the magnesium alloy in the intermetallic phases is less than about 2 volume-percent.
5. The magnesium alloy of claim 1 , wherein the grain size of the alloy is less than about 10 μm.
6. The magnesium alloy of claim 1 , wherein Y is: 0.5-4 weight-percent.
7. The magnesium alloy of claim 1 , wherein Zn is: 0.5-3.0 weight-percent.
8. The magnesium alloy of claim 1 , wherein Mn is: 0-0.25 weight-percent.
9. The magnesium alloy of claim 1 , wherein Ag is: 0.05-0.6 weight-percent.
10. The magnesium alloy of claim 1 , wherein Ce is: 0-0.5 weight-percent.
11. The magnesium alloy of claim 1 , wherein Zr is: 0.3-0.7 weight-percent.
12. The magnesium alloy of claim 1 , wherein Si is: 0-0.25 weight-percent.
13. A magnesium alloy produced by a method, comprising:
(a) preparing a mixture consisting of:
Y:
0.5-10 weight-percent,
Zn:
0.5-6 weight-percent,
Ca:
0.05-0.3 weight-percent,
Mn:
0-0.5 weight-percent,
Ag:
0-1 weight-percent,
Ce:
0-1 weight-percent,
Zr:
0-1 weight-percent, or Si: 0-0.4 weight-percent,
wherein the amounts are based on weight-percent of the mixture, Mg and manufacturing-related impurities constituting the remainder of the mixture to a total of 100 weight-percent;
(b) forming a magnesium alloy by casting the mixture of step a); and
(c) reshaping the magnesium alloy by compressing the casting of step b),
wherein the magnesium alloy has a monophasic structure,
wherein the magnesium alloy has and effective amount of one or more intermetallic phases having a volume amount of less than about 3 vol. % to produce an alloy having a grain size of less than about 20 μm, and
wherein the grain size of the intermetallic phases is less than about 3 μm.