Phase stability of precipitate-hardened CoCrFeNiTi high entropy alloys fabricated via laser-directed energy deposition under high-temperature irradiation

被引：0
作者：
Liu, Shunyu [1 ]
Dixit, Som [1 ]
Chen, Wei-Ying [2 ]
Li, Meimei [2 ]
机构：
[1] Clemson Univ, Dept Automot Engn, Greenville, SC 29607 USA
[2] Argonne Natl Lab, Lemont, IL 60439 USA
来源：
MATERIALS LETTERS | 2024年 / 376卷
关键词：
High entropy alloys; Laser-directed energy deposition; In-situ ion irradiation; Precipitate stability;
D O I：
10.1016/j.matlet.2024.137309
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study investigated the irradiation response of precipitate-hardened CoCrFeNiTi high entropy alloys (HEAs) fabricated by laser-directed energy deposition (LDED). These HEAs were in-situ irradiated with 1 MeV krypton ions (Kr2+) at 400 C-degrees and 600 C-degrees up to 10 displacements per atom (dpa) at the IVEM-Tandem Facility at Argonne National Laboratory. Transmission electron microscopy (TEM) characterized precipitate stability and defect evolution under irradiation. At 400 C-degrees and 10 dpa, precipitates showed high phase stability, while irradiation at 600 C-degrees caused intense dissolution mainly due to its annealing effect. A high density of faulted dislocation loops formed at 400 C-degrees. The annihilation rate of dislocation loops seemed higher at 600 C-degrees. Increasing the dose increased the number and size of voids in the face-centered cubic (FCC) matrix.
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