文献类型：期刊文献

英文题名：Temperature-dependent dynamics and dislocation behavior in nanoscale machining of FeCoNiCrAl high-entropy alloys: Molecular dynamics simulation

作者：Zhang, Ping[1,2];Zhang, Jinlong[1];Zhou, Hanping[1];Sun, Yajie[1];Yue, Xiujie[2,3]

机构：[1]Guangdong Ocean Univ, Coll Mech & Power Engn, Zhanjiang, Peoples R China;[2]Qingdao Huanghai Univ, Coll Intelligent Mfg, Qingdao 266520, Peoples R China;[3]Qingdao Univ Technol, Coll Intelligent Mfg, Qingdao 266520, Peoples R China

年份：2024

卷号：230

外文期刊名：VACUUM

收录：SCI-EXPANDED(收录号：WOS:001337257900001)、、EI(收录号：20244117165297)、Scopus(收录号：2-s2.0-85205720776)、WOS

基金：The work was supported by the National Natural Science Foundation of China (51705270), the National Natural Science Foundation of China (No.51575289), the Natural Science Foundation of Shandong Province (No.ZR2016EEP03) ,the Applied Basic Research Program of Qingdao city (No.19-6-2-69-cg) and Shandong Qingchuang Science and Technology Project (No.2019KJB022) .

语种：英文

外文关键词：High entropy alloy; MD simulation; Ambient temperature; Dislocation behavior; Nanoscale mechanism

外文摘要：This study investigates the impact of machining parameters on forces, thermal dynamics, dislocation behavior, and crystalline structure changes in FeCoNiCrAl high-entropy alloys during nanoscale material removal using molecular dynamics (MD) simulations. Utilizing Embedded Atom Method (EAM) and Tersoff interaction potentials, simulations were performed at cryogenic (73 K) and room (293 K) temperatures. Novel findings reveal that at 73 K, cutting velocities below 200 m/s produced the highest forces along the [001] direction, whereas at 200 m/s, the peak force shifted to [100]. Increasing velocity decreased the force along [001], while [100] exhibited an inverse relationship. At 293 K, the force remained highest along [001] across all velocities. Notably, forces at 73 K were 1.82, 1.79, and 1.58 times higher than at 293 K for velocities of 100, 200, and 300 m/s, respectively. Dislocation density, particularly 1/6<112> (Shockley) dislocations, peaked under all machining conditions, with a slight initial decrease at 293 K before a significant drop with higher cutting speeds. At 293 K and a cutting speed of 100 m/s, dislocation densities for depths of 5, 10, 15, and 20 & Aring; were approximately 1.04, 1.54, 1.17, and 1.14 times greater than those at 73 K, respectively.