期刊
VACUUM
卷 207, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2022.111618
关键词
Defect evolutions; Mechanical properties; W; Fe interfaces; Irradiation resistance; Molecular dynamic study
This paper systematically investigates defect evolutions and mechanical properties of W/Fe semi-coherent interfaces under irradiation using molecular dynamic simulation. It is found that the formation of semi-coherent interfaces can inhibit the nucleation of dislocation loops and improve irradiation resistance. The effects of interface orientation on mechanical properties of W/Fe interfaces under irradiation are also discussed.
Molecular dynamic simulation has been performed to systematically investigate defect evolutions and me-chanical properties of W/Fe semi-coherent interfaces under irradiation. For the simulation of damage cascades, a recently published EAM potential by our group has been first corrected using the universal potential of ZBL. On this basis, the dislocation loop evolutions and stress-strain curves of the irradiated W(110)/Fe(110) and W(100)/ Fe(100) semi-coherent interfaces are derived. It has been found that interstitial atoms of pure W and Fe seriously accumulate with the increasing of irradiation times. Surprisingly, the formation of semi-coherent interfaces can trap the interstitials, and consequently inhibit the dislocation loop nucleation in W and Fe bulks to improve the irradiation resistance. The fundamental effects of interface orientation are also disscussed, and give a deep understanding of mechanical properties of W/Fe interfaces under irradiation.
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