US 11,718,903 B2
Preparation method of multi-functional marine engineering alloy
Zhuhui Qiao, Yantai (CN); Yuan Yu, Yantai (CN); Weimin Liu, Yantai (CN); Huaguo Tang, Yantai (CN); Lujie Wang, Yantai (CN); Tongyang Li, Yantai (CN); Lin Song, Yantai (CN); and Youjian Zhang, Yantai (CN)
Assigned to Shandong Laboratory of Yantai Advanced Materials and GreenManufacturing, Yantai (CN); Yantai Zhongke Research Institute of Advanced Materials andGreen Chemical Engineering, Yantai (CN); and Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou (CN)
Filed by Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai (CN); Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai (CN); and Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou (CN)
Filed on Jul. 5, 2022, as Appl. No. 17/810,703.
Claims priority of application No. 202110757829.6 (CN), filed on Jul. 5, 2021.
Prior Publication US 2023/0002875 A1, Jan. 5, 2023
Int. Cl. C22C 38/42 (2006.01); C22C 33/02 (2006.01); C22C 33/00 (2006.01)
CPC C22C 38/42 (2013.01) [C22C 33/006 (2013.01); C22C 33/0207 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A preparation method of a multi-functional marine engineering alloy, comprising the following steps:
performing a mixed ball milling step comprising:
weighing Co—Cr—Fe—Ni face-centered cubic (FCC)-based high-entropy alloy powder and Cu powder separately;
loading the weighed Co—Cr—Fe—Ni FCC-based high-entropy alloy powder and Cu powder into a ball milling tank for mixed ball milling; and
conducting drying treatment after the ball milling to obtain a mixed powder;
performing a high-temperature sintering step to promote mutual solubility, the high-temperature sintering step comprising:
loading the obtained mixed powder into a graphite die, placing the graphite die in a spark plasma sintering (SPS) furnace;
conducting pressure sintering in a vacuum environment or under protection of inert gas at 1,000-1,500° C. to obtain a sintered material; and
cooling the sintered material to a room temperature with the furnace after the sintering; and
performing a heat treatment step to induce nano-precipitation, the heat treatment step comprising:
placing the sintered material in a heat treatment furnace;
conducting heat preservation heat treatment at 650-950° C.; and
water cooling or cooling with the furnace after the heat treatment to obtain the multi-functional marine engineering alloy,
wherein components of the Co—Cr—Fe—Ni FCC-based high-entropy alloy are in equimolar or nearly molar ratios and have molar percentages of Co(a)Cr(b)Fe(c)Ni(d), a+b+c+d=100, 30≥a≥20, 30≥b≥20, 30≥c≥20, 30≥d≥20, and
a percentage of the Cu powder in the mixed powder of the Co—Cr—Fe—Ni FCC-based high-entropy alloy powder and the Cu powder is 5-20 wt. %.