	US 12,202,040 B2
	Method for preparing Mg-RE alloys with high strength and ductility using selective laser melting additive manufacturing technology
Yujuan Wu, Shanghai (CN); Qingchen Deng, Shanghai (CN); Liming Peng, Shanghai (CN); Yuanhang Luo, Shanghai (CN); Ning Su, Shanghai (CN); Zhiyu Chang, Shanghai (CN); and Xiaoyu Xue, Shanghai (CN)
Assigned to SHANGHAI JIAO TONG UNIVERSITY, Shanghai (CN)
Appl. No. 17/769,325
Filed by SHANGHAI JIAO TONG UNIVERSITY, Shanghai (CN)
PCT Filed Sep. 27, 2020, PCT No. PCT/CN2020/118093 § 371(c)(1), (2) Date Apr. 14, 2022, PCT Pub. No. WO2021/073404, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 201910992966.0 (CN), filed on Oct. 15, 2019.
Prior Publication US 2024/0123499 A1, Apr. 18, 2024
Int. Cl. B22F 10/28 (2021.01); B22F 9/08 (2006.01); B22F 10/34 (2021.01); B22F 10/36 (2021.01); B22F 10/366 (2021.01); B22F 10/64 (2021.01); B22F 10/32 (2021.01); B33Y 10/00 (2015.01); B33Y 80/00 (2015.01)

CPC B22F 10/28 (2021.01) [B22F 9/082 (2013.01); B22F 10/34 (2021.01); B22F 10/36 (2021.01); B22F 10/366 (2021.01); B22F 10/64 (2021.01); B22F 10/32 (2021.01); B22F 2301/058 (2013.01); B33Y 10/00 (2014.12); B33Y 80/00 (2014.12)]

8 Claims

1. A method for preparing magnesium gadolinium (Mg—Gd) alloys using selective laser melting (SLM) additive manufacturing technology, comprising the following steps:

step A: preparing Mg—Gd—(Zn)—Zr pre-alloyed spherical powder by gas atomization;

step B: molding the Mg—Gd—(Zn)—Zr pre-alloyed spherical powder using SLM to obtain the Mg—Gd alloys; and

step C: conducting heat treatment on the Mg—Gd alloys prepared in step B: solid solution heat treatment with aging treatment or only aging treatment;

wherein in step A, the Mg—Gd—(Zn)—Zr pre-alloyed spherical powder contains the following elements in weight percentages: Gd 10-20%, Zn 0-2%, Zr 0-0.5%, with a balance being Mg and unavoidable impurities, wherein a total amount of the unavoidable impurities is less than 0.02%; and

wherein in step B, related laser parameters adopted in the SLM molding are as follows: a laser power of 80-160 W, a scanning speed of 100-1000 mm/s, a hatch spacing of 50-100 μm, and a spot diameter of 65-150 μm.