Scandium-containing aluminium alloy for powder metallurgical technologies
View Patent ↗A scandium-containing aluminium powder alloy, wires and materials including said alloy, and a method for producing the scandium-containing aluminium powder alloy, the wires and materials, the proportion of scandium in the scandium-containing aluminium powder alloy being elevated, are disclosed. At least one element is selected from the group consisting of the lanthanum group except for Ce, Y, Ga, Nb, Ta, W, V, Ni, Co, Mo, Li, Th, Ag.
1. A scandium-containing aluminum powder alloy, comprising elements as follows, in % by weight, based on the total composition of the alloy:
Mg
0.5-10
Sc
0.6-30
Zr
0.05-1.5
Mn
0.01-1.5
Zn
0.2-1.0
Ti
0.01-0.2
Ce
≤0.25
Be
0-0.004
B
0-0.008
Si
≤0.25
Fe
≤0.25
Hf
≤0.5
at least one selected from the group consisting of La, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Ga, Nb, Ta, W, V, Ni, Co, Mo, Li, Th, and Ag in a proportion of at most 0.5,
and Al as the remainder,
and further comprising impurities of in total at most 0.5% by weight,
wherein the scandium-containing aluminum powder alloy has a primary phase, and a secondary phase, wherein particles in the primary phase have a formula of Al 3 (Sc 1-x Zr x ), x<1, and a grain diameter of no greater than 20 μm.
2. The scandium-containing aluminum powder alloy of claim 1 , wherein the particles of the powder have a grain diameter of from 1 to 250 μm.
3. The scandium-containing aluminum powder alloy of claim 1 , wherein the proportion of Zr is at most half of the proportion of Sc.
4. The scandium-containing aluminum powder alloy of claim 1 , wherein the proportion of the sum of Zr+Ti is less than ⅓ of the proportion of Sc.
5. A wire, prepared by the scandium-containing aluminum powder alloy of claim 1 .
6. A material or workpiece, prepared by the scandium-containing aluminum powder alloy of claim 1 .
7. The material or workpiece of claim 6 , wherein said material or workpiece is a component, a semi-finished product, or a welding filler material.
8. The material or workpiece of claim 6 , wherein the scandium-containing aluminum powder alloy is deposited in a layer of the material or workpiece.
9. The material or workpiece of claim 6 , wherein the scandium-containing aluminum powder alloy is heated and subsequently cooled at a cooling rate of more than 10 K/s.
10. The material or workpiece of claim 9 , wherein after the cooling, the material or the workpiece is heated to a temperature of from 100-400° C.
11. The material or workpiece of claim 8 , wherein the scandium-containing aluminum powder alloy is deposited under an inert gas.
12. The scandium-containing aluminum powder alloy of claim 1 , wherein Hf is included in 0.15-0.25% by weight, based on the total composition of the alloy.
13. The scandium-containing aluminum powder alloy of claim 1 , which is prepared by melting, spraying or atomizing and cooling at a cooling rate of more than 10 K/s a mixture comprising the elements in % by weight, based on the total composition of the mixture.
14. The scandium-containing aluminum powder alloy of claim 1 , wherein a high concentration of the Sc is in the secondary phase.
15. The material or workpiece of claim 8 , wherein the scandium-containing aluminum powder alloy is deposited in the layer of the material or workpiece by an additive layer manufacturing (ALM) process.