US 12,252,772 B2
Methods of cold forming aluminum lithium alloys
Logan Kirsch, Lafayette, IN (US); Les A. Yocum, West Lafayette, IN (US); Diana K. Denzer, Lower Burrell, PA (US); Douglas S. Bae, Pittsburgh, PA (US); Andreas K. Kulovits, Pittsburgh, PA (US); and Ronald G. Cheney, Chandler, AZ (US)
Assigned to ARCONIC TECHNOLOGIES LLC, Pittsburgh, PA (US)
Filed by ARCONIC TECHNOLOGIES LLC, Pittsburgh, PA (US)
Filed on Oct. 4, 2021, as Appl. No. 17/449,856.
Application 17/449,856 is a continuation of application No. PCT/US2020/026443, filed on Apr. 2, 2020.
Claims priority of provisional application 62/829,799, filed on Apr. 5, 2019.
Prior Publication US 2022/0307119 A1, Sep. 29, 2022
Int. Cl. C22F 1/057 (2006.01); C22C 21/16 (2006.01); C22C 21/18 (2006.01)
CPC C22F 1/057 (2013.01) [C22C 21/16 (2013.01); C22C 21/18 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method comprising:
prior to solution heat treatment, cold forming an unrecrystallized extruded aluminum-lithium product into a second product form;
(i) wherein the unrecrystallized extruded aluminum-lithium product comprises from 0.2-5.0 wt. % Li;
(ii) wherein the unrecrystallized extruded aluminum-lithium product is predominately unrecrystallized;
(iii) wherein the cold forming comprising initiating the cold forming when the unrecrystallized extruded aluminum-lithium product has a temperature of not greater than 400° F.;
(iv) wherein the cold forming comprises plastically deforming the unrecrystallized extruded aluminum-lithium product, wherein the plastically deforming comprises at least one of:
(A) non-uniformly deforming the unrecrystallized extruded aluminum-lithium product, wherein, due to the non-uniform deforming, a first portion of the second product form realizes a first strain amount and a second portion of the second product form realizes a second strain amount, wherein the first strain amount is at least 1% different than the second strain amount; and
(B) applying curvature to the unrecrystallized extruded aluminum-lithium product, wherein the second product form comprises at least one arcuate surface;
(v) wherein the second product form is predominately unrecrystallized.