Method of forming an Al—Mg alloy plate product
View Patent ↗The invention relates to a method of forming an AlMg alloy armor plate product, and comprising the steps of: (i) providing a plate product having a gauge of at least 10 mm and a chemical composition, in wt. %: Mg 2.5% to 6%, Mn 0 to 1.2%, Sc 0 to 1%, Ag 0 to 0.5%, Zn 0 to 2%, Cu 0 to 2%, Li 0 to 3%, optionally at least one or more elements selected from the group consisting of (Zr 0.03% to 0.4%, Cr 0.03% to 0.4%, and Ti 0.005% to 0.3%), Fe 0 to 0.4%, Si 0 to 0.25%, inevitable impurities and balance aluminum, and (ii) shaping said alloy plate at a temperature in a range of 200° C. to 400° C. to obtain a predetermined two- or three-dimensional formed structure.
1. A method of obtaining a predetermined two- or three-dimensional formed structure of an AlMg alloy plate product, comprising the steps of:
providing an alloy plate having a gauge of at least 10 mm and a chemical composition, in wt. %:
Mg 2.5% to 6%,
Mn 0 to 1.2%,
Sc 0 to 1%,
Ag 0 to 0.5%,
Zn 0 to 2%,
Cu 0 to 2%,
Li 0 to 3%,
optionally at least one or more elements selected from the group consisting of Zr 0.03% to 0.4%, Cr 0.03% to 0.4%, and Ti 0.005% to 0.3%,
optionally one or more elements selected from the group of Er, Dy, Gd, and Hf in a total amount of 0.03% to 0.3%,
Fe 0 to 0.4%,
Si 0 to 0.25%,
inevitable impurities and balance aluminium;
shaping or forming the alloy plate at a temperature in a range of 200° C. to 400° C. to obtain the predetermined two- or three-dimensional formed structure; and
heat treating the predetermined two- or three-dimensional formed structure.
2. The method according to claim 1 , wherein the alloy plate-shaping or forming comprises a shaping or forming process selected from the group of bending, pressing, roll forming, stretch-forming, and creep-forming.
3. The method according to claim 1 , wherein the alloy plate has a gauge of 10 mm to 100 mm.
4. The method according to claim 1 , wherein the alloy plate is shaped or formed at a temperature in the range of 200° C. to 350° C.
5. The method according to claim 1 , wherein the alloy plate is shaped or formed at a temperature in the range of 250° C. to 375° C.
6. The method according to claim 1 , wherein the alloy plate is aged after shaping or forming.
7. The method according to claim 1 , wherein the chemical composition has Sc in a range of 0.05% to 1%.
8. The method according to claim 1 , wherein the chemical composition has Mg in a range of 3.7% to 4.7%.
9. The method according to claim 1 , wherein the chemical composition has,
Mg 2.5% to 6%,
Mn 0 to 1.2%,
Sc 0 to 1%,
Ag 0 to 0.5%,
Zn 0 to 2%,
Cu 0 to 2%,
Li 0 to 3%,
optionally at least one or more elements selected from the group consisting of Zr 0.03% to 0.4%, Cr 0.03% to 0.4%, and Ti 0.005% to 0.4%,
optionally one or more elements selected from the group of Er, Dy, Gd, and Hf in a total amount of 0.01% to 0.3%,
Fe 0 to 0.4%,
Si 0 to 0.25%,
inevitable impurities and balance aluminium.
10. The method according to claim 1 , wherein the chemical composition has a composition within the ranges of AA5024.
11. The method according to claim 1 , wherein the chemical composition has,
Mg 4.95% to 6.0%,
Mn 0.4% to 1.4%,
Zn 0 to 0.9%,
Zr 0.05% to 0.25%,
Cr<0.3%,
Sc<0.5%,
Ti<0.3%,
Fe<0.5%,
Si<0.45%,
Ag<0.4%,
Cu<0.6%,
other elements and unavoidable impurities each <0.05%, total <0.20%, balance aluminium.
12. The method according to claim 11 , wherein the chemical composition has Zn in a range of 0.3% to 0.9%.
13. The method according to claim 11 , wherein the chemical composition has Cu in a range of 0.1% to 0.6%.
14. A method of use comprising applying a formed aluminium alloy plate according to claim 1 as armour plate to an armoured vehicle.
15. An armoured vehicle comprising an Al—Mg alloy plate formed according to the method of claim 1 .
16. The method according to claim 1 , wherein the chemical composition has Mn in a range of 0.05% to 1.2%.
17. The method according to 1 , wherein the plate product is shaped or formed at a temperature in the range of 300° C. to 350° C.
18. The method according to claim 1 , wherein the chemical composition has Sc in a range of 0.05% to 0.4%.
19. The method according to claim 1 , wherein the chemical composition has,
Mg 3.7% to 4.7%,
Mn 0.05% to 1.2%,
Sc 0.05% to 0.4%,
Ag 0 to 0.5%,
Zn 0 to 2%,
Cu 0 to 2%,
Li 0 to 3%,
optionally at least one or more elements selected from the group consisting of Zr 0.03% to 0.4%, Cr 0.03% to 0.4%, and Ti 0.005% to 0.4%,
optionally one or more elements selected from the group of Er, Dy, Gd, and Hf in a total amount of 0.01% to 0.3%,
Fe 0 to 0.4%,
Si 0 to 0.25%,
inevitable impurities and balance aluminium.
20. The method according to claim 1 , wherein the chemical composition has,
Mg 5.0% to 5.7%,
Mn 0.65% to 1.2%,
Zn 0 to 0.9%,
Zr 0.05% to 0.25%,
Cr<0.3%,
Sc<0.5%,
Ti<0.3%,
Fe<0.25%,
Si<0.2%,
Ag<0.4%,
Cu<0.6%,
other elements and unavoidable impurities each <0.05%, total <0.20%, balance aluminium.
21. The method according to claim 1 ,
wherein heat treating of the shaped or formed two- or three-dimensional formed structure is solution heat treatment which takes place at a temperature sufficient to allow at least copper, lithium and zinc to enter into solid solution;
wherein the heat treated shaped or formed two- or three-dimensional formed structure is cooled rapidly enough to maintain the solid solution.
22. The method according to claim 1 , wherein, the alloy plate has been hot-rolled or hot-rolled and cold-rolled so that the alloy plate is substantially flat prior to said shaping or forming.