利用分子动力学方法研究超薄Ni/Ni3Al (001)纳米线力学性能和晶体缺陷的拉压不对称,对应力-应变曲线和晶体曲线在不同的温度下进行比较.模拟表明在拉伸载荷作用下不全位错的施密特因子大于压缩载荷下的施密特因子,在10 K温度下的流变应力行为异常,同时超薄Ni/Ni3Al (001)纳米线在不同温度下都表现为抵抗压缩载荷能力比拉伸载荷强.结果显示超薄Ni/Ni3Al (001)纳米线具有显著的拉伸不对称特性.此外,堆积层错提高原子移动,不全位错从堆垛层错处发射.在促进位错发射过程中原子移动扮演着重要的角色;而且在拉-压载荷下不同晶体缺陷主要是点位错和层错,层错主要发生在4个{111}方向.研究拉压不对称与温度之间的关系,可以更准确和全面的理解超薄Ni/Ni3Al (001)纳米线的力学性能.
参考文献
| [1] | Huang, D.;Zhang, Q.;Qiao, P. .Molecular dynamics evaluation of strain rate and size effects on mechanical properties of FCC nickel nanowires[J].Computational Materials Science,2011(3):903-910. |
| [2] | Wang, J.;Hu, W.;Li, X.;Xiao, S.;Deng, H. .Strain-driven phase transition of molybdenum nanowire under uniaxial tensile strain[J].Computational Materials Science,2010(2):373-377. |
| [3] | Huang, D.;Zhang, Q.;Qiao, P. .Molecular dynamics evaluation of strain rate and size effects on mechanical properties of FCC nickel nanowires[J].Computational Materials Science,2011(3):903-910. |
| [4] | Park, HS;Gall, K;Zimmerman, JA .Deformation of FCC nanowires by twinning and slip[J].Journal of the Mechanics and Physics of Solids,2006(9):1862-1881. |
| [5] | Tschopp MA;Tucker GJ;McDowell DL .Atomistic simulations of tension-compression asymmetry in dislocation nucleation for copper grain boundaries[J].Computational Materials Science,2008(2):351-362. |
| [6] | Tschopp MA;McDowell DL .Influence of single crystal orientation on homogeneous dislocation nucleation under uniaxial loading[J].Journal of the Mechanics and Physics of Solids,2008(5):1806-1830. |
| [7] | Dongare, A.M.;Rajendran, A.M.;Lamattina, B.;Zikry, M.A.;Brenner, D.W. .Tension-compression asymmetry in nanocrystalline Cu: High strain rate vs. quasi-static deformation[J].Computational Materials Science,2010(2):260-265. |
| [8] | Wu, W.-P.;Guo, Y.-F.;Wang, Y.-S.;Mueller, R.;Gross, D. .Molecular dynamics simulation of the structural evolution of misfit dislocation networks at γ/γ′ phase interfaces in Ni-based superalloys[J].Philosophical magazine: structure and properties of condensed matter,2011(1/3):357-372. |
| [9] | Park HS .Stress-induced martensitic phase transformation in intermetallic nickel aluminum nanowires[J].Nano letters,2006(5):958-962. |
| [10] | Guo, Q.-N.;Yue, X.-D.;Yang, S.-E.;Huo, Y.-P. .Tensile properties of ultrathin copper films and their temperature dependence[J].Computational Materials Science,2010(2):319-330. |
| [11] | Li J. .AtomEye: an efficient atomistic configuration viewer[J].Modelling and simulation in materials science and engineering,2003(2):173-177. |
| [12] | Yuasa, M.;Nakazawa, T.;Mabuchi, M. .Atomic simulations of dislocation emission from Cu/Cu and Co/Cu grain boundaries[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2010(1):260-267. |
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