采用多尺度准连续介质法(简称QC方法)对单晶Ag薄膜纳米压痕过程进行模拟,研究压头宽度对纳米压痕过程中接触应力分布、位错形核临界载荷以及纳米硬度的影响,并用Rice-Thomson位错模型(简称R-T位错模型)进行分析.结果表明,纳米压痕获得的载荷.位移曲线呈现出的不连续性与位错之间的协同作用密切相关;压头尺寸对纳米压痕过程中接触应力分布、位错形核临界载荷以及纳米硬度具有明显的影响:随着压头宽度的增加,法向和切向接触应力以及纳米硬度值递减,呈现出明显的压头尺寸效应;而压头下方薄膜内位错形核临界载荷却递增,且与压头半宽度的平方根成正比.模拟结果与相应实验结果以及R-T位错模型计算结果吻合.
参考文献
| [1] | Siegel R W;Fougere G E .[J].Nanostructured Materials,1995,6(1-4):205. |
| [2] | Wang Y;Chen M;Zhou F;Ma E .High tensile ductility in a nanostructured metal.[J].Nature,2002(6910):912-915. |
| [3] | Valiev R .[J].Nature Materials,2004,3(08):511. |
| [4] | Oliver W C et al.[J].Journal of Materials Research,1992,7(06):1564. |
| [5] | Bhushan B et al.[J].Applied Physics Letters,1994,64(13):1653. |
| [6] | Zimmerman J A et al.[J].Physical Review Letters,2001,87(16):165507. |
| [7] | Nowak R et al.[J].Journal of Materials Research,1997,12(01):64. |
| [8] | Soifer Y M et al.[J].cripta Mater,2002,47(12):799. |
| [9] | 黎军顽,倪玉山,林逸汉,罗诚,江五贵.Al薄膜纳米压痕过程的多尺度模拟[J].金属学报,2009(02):129-136. |
| [10] | Smith R et al.[J].Physical Review B:Condensed Matter,2003,67(24):245405. |
| [11] | Mirshams R A et al.[J].Acta Materialia,2006,54(04):1123. |
| [12] | 江五贵,黎军顽,苏建君,汤井伦.纳米压痕试验中压头尺寸效应的准连续介质法分析[J].固体力学学报,2007(04):375-379. |
| [13] | Viassak J J et al.[J].Journal of the Mechanics and Physics of Solids,1994,42(08):1223. |
| [14] | Kiely JD.;Houston JE. .Nanomechanical properties of Au (111), (001), and (110) surfaces[J].Physical Review.B.Condensed Matter,1998(19):12588-12594. |
| [15] | Kim J Y et al.[J].Acta Materialia,2008,56(14):3338. |
| [16] | Shim S et al.[J].Scripta Materialia,2008,59(10):1095. |
| [17] | Tadmor E B et al.[J].Phys MagA,1996,73(06):1529. |
| [18] | Shenoy V B et al.[J].Journal of the Mechanics and Physics of Solids,1999,47(03):611. |
| [19] | 倪玉山,王华滔.准连续介质方法及其应用[J].机械工程学报,2007(08):101-108. |
| [20] | Shenoy V B et al.[J].Journal of the Mechanics and Physics of Solids,2000,48(04):649. |
| [21] | Tadmor E B et al.[J].Journal of Materials Research,1999,14(06):2233. |
| [22] | 黎军顽,江五贵.基于准连续介质法预测薄膜材料纳米硬度和弹性模量[J].金属学报,2007(08):851-856. |
| [23] | Dupont V et al.[J].Acta Materialia,2008,56(20):6013. |
| [24] | Jin J et al.[J].Acta Materialia,2008,56(16):4358. |
| [25] | Prudhomme S et al.[J].INTERNATIONAL JOURNAL FOR MULTISCALE COMPUTATIONAL ENGINEERING,2006,4(5-6):647. |
| [26] | Heino P.;Kaski K.;Hakkinen H. .Molecular-dynamics study of mechanical properties of copper[J].Europhysics Letters,1998(3):273-278. |
| [27] | Voter A E.The Embedded Atom Method,Intermetallic Compounds:Principles and Applications[M].New York:John Wiley and Sons,Inc,1994:77. |
| [28] | Liu Y et al.[J].Journal of the Mechanics and Physics of Solids,2005,53(12):2718. |
| [29] | Chen P;Shen YP .Nanocontact between BCC tungsten and FCC nickel using the quasicontinuum method[J].International Journal of Solids and Structures,2008(24):6001-6017. |
| [30] | Gouldstone A et al.[J].Acta Materialia,2000,48(09):2277. |
| [31] | Van Vliet K J et al.[J].Physical Review B:Condensed Matter,2003,67(10):104105. |
| [32] | Yu H H et al.[J].Journal of the Mechanics and Physics of Solids,2007,55(03):489. |
| [33] | Rice R J R et al.[J].Philosophical Magazine,1974,29(01):73. |
| [34] | Johnson K L.Contact Mechanics[M].Cambridge:Cambridge University Press,1985 |
| [35] | Wang H T et al.[J].Transactions of Nonferrous Metals Society of China,2008,18(05):1164. |
| [36] | Ma Q.;Clarke DR. .SIZE DEPENDENT HARDNESS OF SILVER SINGLE CRYSTALS[J].Journal of Materials Research,1995(4):853-863. |
| [37] | Abu AI-Rub R K et al.[J].International Journal of Plasticity,2004,20(06):1139. |
| [38] | 王华滔,秦昭栋,倪玉山,张文.不同晶体取向下纳米压痕的多尺度模拟[J].物理学报,2009(02):1057-1063. |
| [39] | Nix WD.;Gao HJ. .Indentation size effects in crystalline materials: A law for strain gradient plasticity[J].Journal of the Mechanics and Physics of Solids,1998(3):411-425. |
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