Title: Al-Li alloy low-temp superplasticity pretreating method
Application Number: 95113916 Application Date: 1995.11.14
Publication Number: 1150179 Publication Date: 1997.05.21
Approval Pub. Date: Granted Pub. Date: 2000.02.09
International Classifi-cation: C22C21/00,C22F1/04
Applicant(s) Name: Dongbei Univ. Address: 110006
Inventor(s) Name: Zhang Baojin, Zeng Meiguang
Attorney & Agent: GUO SHAOQING
Abstract:
     A low-temp. super-plasticity pretreating process for Al-Li alloy includes such steps as uniforming and milling the surface of alloy ingot, wrapping aluminium, heating to 300-400 deg.C, applying 10-15 MPa and insulating at the same temp. for 30-50 min, hot-rolling to 10 mm at 450 deg.C, solid dissolving at 530 deg.C for 1-2 hr, ageing at 360-420 deg.C for 24-40 hr, cold-rolling to 1.2-1.5 mm, low-temp. recrystallizing at 250-450 deg.C for 25-40 min and quenching in water, and features lowering super-plasticity deformation temp. by 60-100 deg.C, increasing strain rate by 10 times and effectively surppressing oxidation and lithium loss in the process of super-plasticity treatment and strain. It is suitable for low-temp. super-plasticity pretreatment of Al-Li-Cu-Mg-Zr series alloys.
Time: 6
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