Size of the Plastic Zone Produced by Nanoscratching

被引：22

作者：

Alhafez, Iyad Alabd ^{[1
,2
]}

Ruestes, Carlos J. ^{[3
,4
]}

Urbassek, Herbert M. ^{[1
,2
]}

机构：

[1] Univ Kaiserslautern, Dept Phys, Erwin Schrodinger Str, D-67663 Kaiserslautern, Germany

[2] Univ Kaiserslautern, Res Ctr OPTIMAS, Erwin Schrodinger Str, D-67663 Kaiserslautern, Germany

[3] Univ Nacl Cuyo, CONICET, RA-5500 Mendoza, Argentina

[4] Univ Nacl Cuyo, Fac Ciencias Exactas & Nat, RA-5500 Mendoza, Argentina

来源：

TRIBOLOGY LETTERS | 2018年 / 66卷 / 01期

关键词：

Molecular dynamics; Nanoindentation; Scratching; Dislocations; Plasticity; INTERATOMIC POTENTIALS APPROPRIATE; ATOMISTIC SIMULATION; MOLECULAR-DYNAMICS; EDGE DISLOCATION; MD SIMULATION; BCC-IRON; NANOINDENTATION; DEFORMATION; CRYSTALLINE; INDENTATION;

D O I：

10.1007/s11249-017-0967-9

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Nanoscratching of ductile materials creates plastic zones surrounding the scratch groove. We approximate the geometry of these zones by a semicylinder with its axis oriented along the scratch direction. The radius and the length of the cylinder, as well as the length of the dislocations in the network created quantify the plasticity generated. Using molecular dynamics simulations, we characterize the plastic zones in six metals with fcc, bcc, and hcp crystal structures. We find that the plastic zone sizes after scratch are comparable to those after indent. Due to dislocation reactions, the dislocation networks simplify, reducing the total length of dislocations. As a consequence, the average dislocation density in the plastic zone stays roughly constant. Individually, we find exceptions from this simple picture. Fcc metals show strong plastic activity, which even increases during scratch. The hcp metals on the other side show the least plastic activity. Here the plasticity may be strongly reduced during scratch and particularly during tip withdrawal.

引用

页数：12

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