US 11,697,868 B2
Processing technology for inhibiting weld coarse grains of magnesium alloy profiles
Liang Chen, Shandong (CN); Jianwei Tang, Shandong (CN); Zhigang Li, Shandong (CN); Guoqun Zhao, Shandong (CN); and Cunsheng Zhang, Shandong (CN)
Assigned to SHANDONG UNIVERSITY, Shandon (CN)
Filed by SHANDONG UNIVERSITY, Shandong (CN)
Filed on Jun. 20, 2022, as Appl. No. 17/844,065.
Claims priority of application No. 202111197811.1 (CN), filed on Oct. 14, 2021.
Prior Publication US 2023/0117724 A1, Apr. 20, 2023
Int. Cl. C22F 1/06 (2006.01); C22F 1/00 (2006.01)
CPC C22F 1/06 (2013.01) [C22F 1/002 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A processing technology for inhibiting weld coarse grains of magnesium alloy profiles, comprising the following steps:
(1) preparing a magnesium alloy ingot, wherein a size of the ingot needs to be selected according to an extruder used;
(2) homogenizing the magnesium alloy ingot;
(3) scalping the magnesium alloy ingot obtained in step (2);
(4) extruding the magnesium alloy ingot obtained in step (3) to obtain a magnesium alloy extruded profile, and at the same time, cooling an extrusion die by using liquid nitrogen during extrusion;
(5) pre-stretching the extruded profile obtained in step (4) at room temperature;
(6) performing solution treatment on the magnesium alloy profile pre-stretched in step (5), and quenching the magnesium alloy profile after the solution treatment is completed;
(7) performing stretching correction on the magnesium alloy profile after the solution treatment in step (6); and
(8) artificially aging the profile obtained in step (7), wherein
in step (5), a pre-stretching deformation at room temperature is 10-20%,
in step (4), a temperature of the magnesium alloy ingot is 250-350° C., a temperature of the die is 280-380° C., a temperature of an extrusion cylinder is 260-360° C., an extrusion speed is 0.5-5 mm/s, and an outlet pressure of the liquid nitrogen is 0.5-0.6 MPa,
in step (6), a solution treatment temperature is 380-420° C., and a solution treatment time is 1-3 h,
in step (7), a stretching deformation of the stretching correction is 0.5-1.5%,
in step (8), an aging temperature is 98-225° C., and an aging time is 12-144 h.