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 Deformation and machining mechanism of nanocrystalline NiCoCrFe high entropy alloys
Tác giả hoặc Nhóm tác giả: Thi-Xuyen Bui, Te-Hua Fang, Chun-I Lee
Nơi đăng: Journal of Alloys and Compounds (Elsevier); Số: 924;Từ->đến trang: 166525;Năm: 2022
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
The effect of composition, grain sizes (GSs), and cutting depths on the deformation behaviors and subsurface damages of scratched NiCoCrFe high entropy alloys are investigated using molecular dynamics (MD) simulation. The ability to remove atoms during the cutting process depends on the alloy composition and GSs. When Ni, Co compositions are kept constant, the maximum tangential force-Fx and average friction coefficient-μ increase as decreasing Fe composition from 40% to 24%, then that inverse increase as continuous decrease Fe composition to 20%. Maximum normal force-Fz and average VMS increase with increasing percentage composition of Fe. Besides, the dislocation increases with the Co composition increase leading to a reduction in the efficiency of the cutting process or reducing the number of worn atoms.
ABSTRACT
The effect of composition, grain sizes (GSs), and cutting depths on the deformation behaviors and subsurface damages of scratched NiCoCrFe high entropy alloys are investigated using molecular dynamics (MD) simulation. The ability to remove atoms during the cutting process depends on the alloy composition and GSs. When Ni, Co compositions are kept constant, the maximum tangential force-Fx and average friction coefficient-μ increase as decreasing Fe composition from 40% to 24%, then that inverse increase as continuous decrease Fe composition to 20%. Maximum normal force-Fz and average VMS increase with increasing percentage composition of Fe. Besides, the dislocation increases with the Co composition increase leading to a reduction in the efficiency of the cutting process or reducing the number of worn atoms.
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