US 12,173,385 B2
Weldable in-situ nano-strengthened rare-earth metal containing aluminum alloy with high strength and toughness and preparation method thereof
Xizhou Kai, Jiangsu (CN); Yutao Zhao, Jiangsu (CN); Yanjie Peng, Jiangsu (CN); Gang Chen, Jiangsu (CN); Ruikun Chen, Jiangsu (CN); Lin Wu, Jiangsu (CN); Ran Tao, Jiangsu (CN); and Xiangfeng Liang, Jiangsu (CN)
Assigned to Jiangsu University, Jiangsu (CN)
Appl. No. 18/287,187
Filed by Jiangsu University, Jiangsu (CN)
PCT Filed Jun. 3, 2021, PCT No. PCT/CN2021/098105
§ 371(c)(1), (2) Date Oct. 17, 2023,
PCT Pub. No. WO2022/246889, PCT Pub. Date Dec. 1, 2022.
Claims priority of application No. 202110583558.7 (CN), filed on May 27, 2021.
Prior Publication US 2024/0200166 A1, Jun. 20, 2024
Int. Cl. C22C 1/10 (2023.01); B22D 11/00 (2006.01); B22D 11/114 (2006.01); C22C 21/00 (2006.01); C22C 21/10 (2006.01); C22F 1/00 (2006.01); C22F 1/053 (2006.01)
CPC C22C 1/1052 (2023.01) [B22D 11/003 (2013.01); B22D 11/114 (2013.01); C22C 21/003 (2013.01); C22C 21/10 (2013.01); C22F 1/002 (2013.01); C22F 1/053 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A preparation method of a weldable in-situ nano-strengthened rare-earth metal-containing aluminum alloy, the weldable in-situ nano-strengthened rare-earth metal-containing aluminum alloy comprising the following chemical components in mass percentages: Zn: 5 to 7, Mg: 2 to 3, Mn: 0.7 to 0.8, Cr: 0.1 to 0.2, Cu: 0.2 to 0.3, Zr: 1.5 to 8, Ti: 1.5 to 8, B: 0.4 to 5, O: 0.2 to 2, Er: 0.05 to 0.3, Sc: 0.05 to 0.3, Y: 0.1 to 0.5, and Al: the balance, wherein the weldable in-situ nano-strengthened rare-earth metal-containing aluminum alloy is prepared through composition control, in-situ nano-ceramic particle strengthening and refinement, rare-earth metal microalloying, acoustic magnetic field-controlled compounding, and ultrasonic semi-continuous casting based on an Al—Zn—Mg aluminum alloy as a matrix, to obtain the weldable in-situ nano-strengthened rare-earth metal-containing aluminum alloy comprising nano-Al3(Er+Zr) rare-earth metal-containing precipitated phase, nano-Al3(Sc+Zr) rare-earth metal-containing precipitated phase, and nano-Al3Y rare-earth metal-containing precipitated phase uniformly distributed in grains and a large number of in-situ nano-ZrB2 ceramic particles, in-situ nano-Al2O3 ceramic particles, and in-situ nano-TiB2 ceramic particles distributed at grain boundaries; and the preparation method comprises the following specific steps:
(1) performing an in-situ reaction for in-situ generating the nano-ceramic particles under a control of an acoustic magnetic field;
(2) after the in-situ reaction is completed, introducing metal elements and rare-earth metals as follows: after the in-situ reaction is completed, cooling to 750° C. to 760° C., adding pure Zn, pure Cu, Al—Cr, Al—Mn, Al—Zr, and rare-earth metal-containing intermediate alloys, and conducting a reaction for 10 min to 15 min; after the reaction is completed, conducting slagging-off, refining, and degassing; and cooling to 680° C., adding pure Mg, and further conducting a reaction for 10 min to 15 min, wherein the rare-earth metals are Sc, Er, and Y;
(3) preparing an aluminum alloy ingot with uniform components, and a controllable distribution of the nano-ceramic particles in the grains or at the grain boundaries through the ultrasonic semi-continuous casting; and
(4) finally, subjecting the aluminum alloy ingot to homogenization, forming, and a heat treatment to obtain the weldable in-situ nano-strengthened rare-earth metal-containing aluminum alloy.