Aluminum-lithium flat rolled product and method of making
AssigneeAluminum Company of America
InventorsKenton P. Young, Edward L. Colvin, Joel A. Bowers, Robert W. Westerlund
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Abstract
Disclosed is a method of making aluminum base alloy flat rolled product substantially free of Luder's lines after stretching, the method comprising the steps of providing a body of a lithium-containing aluminum base alloy and working the body to produce a flat rolled product prior to solution heat treating and quenching. The flat rolled product is preaged for a time and temperature which does not substantially affect mechanical properties but which permits stretching the flat rolled product without formation of Luder's lines. Thereafter, the preage flat rolled product is stretched and aged to a condition having a substantially stable level of mechanical properties.
Claims20
A method of making aluminum base alloy flat rolled product substantially free of Luder's lines after stretching, the method comprising the steps of:
- (a) providing a body of a lithium-containing aluminum base alloy;
- (b) working said body to produce a flat rolled product;
- (c) solution heat treating and quenching said flat rolled product;
- (d) preaging said flat rolled product for a time and temperature which does not substantially affect final mechanical properties but which permits stretching said flat rolled product without formation of Luder's lines;
- (e) stretching said preage flat rolled product;
- and
- (f) aging said product to a condition having a substantially stable level of mechanical properties.
A method of making an aluminum base alloy clad product substantially free of Luder Lines after stretching, the method comprising the steps of:
- (a) providing a clad product having a thickness in the range of 0.010 to 0.249 inch and having a core selected from 2090 or 2091 and having a cladding on at least one side thereof selected from 1100, 1200, 1230, 1135, 1235, 1435, 1145, 1345, 1250, 1350, 1170, 1175, 1180, 1185, 1285, 1188, 1199 or 7072;
- (b) solution heat treating and quenching said flat rolled product;
- (c) preaging said flat rolled product for a time and temperature which does not substantially affect mechanical properties but which permits stretching said flat rolled product without formation of Luder's lines;
- (d) stretching said preage flat rolled product;
- and
- (e) aging said product to a condition having a substantially stable level of mechanical properties.
A method of making aluminum base alloy flat rolled product substantially free of Luder's lines after stretching, the method comprising the steps of:
- (a) providing a body of a lithium-containing aluminum base alloy consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 1.0 wt. % Zr, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, the balance aluminum and incidental impurities;
- (b) working said body to produce a flat rolled product;
- (c) solution heat treating and quenching said flat rolled product;
- (d) preaging said flat rolled product for at least 6 hours at a temperature in the range of 200.degree. to 270.degree. F.;
- (e) stretching said preage flat rolled product;
- and
- (f) aging said product to a condition having a substantially stable level of mechanical properties.
A lithium-containing aluminum base alloy preaged stretched sheet product substantially free of Luder's Lines after stretching, the freedom from Luder's Lines resulting from preaging the sheet product prior to stretching.
Dependencies are inferred from the claim text.