通过一种新型表面自纳米化方法———表面深滚处理，在纯镍（N4）表面制备出晶粒尺寸小于500nm 的梯度超细晶结构，并对材料次表面微观组织结构、残余应力分布及力学性能进行了研究。结果表明：N4经过表面深滚处理，表面形成织构；由于剧烈塑性变形，位错大量产生，并出现胞状组织和高密度位错墙，这些组织经过演化形成超细晶，并在表面形成具有一定厚度的残余压应力场；与原始材料相比，经过表面深滚处理后表面组织硬度提高近一倍；通过合理选择滚压参数，其细化层厚度、硬度、表面粗糙度及残余应力分布均得到不同程度改善。
Surface self-nanocrystallization by means of surface deep rolling (SDR)was applied to produce gradient ultra-fine grain structure with the grain size less than 500 nm near the surface of pure Nickel.The subsurface microstructure,residual stress field and mechanical properties of the treated nickel were investigated.It is found that the texture structure is formed near the nickel surface after SDR treatment.Due to severe plastic deformation,a large number of dislocations,dislocation cells and high density-dislocation walls are generated,leading to the formation of ultra-fine grain structure and large compressive stress near the surface.By comparing with the as-received material,the hardness of the material is increased nearly double after SDR treatment.The thickness,hardness,surface roughness of refined layer and residual stress field within it can be adjusted through proper selection of treatment parameters.
参考文献
| [1] | K. S. Kumar;H. Van Swygenhoven;S. Suresh.Mechanical behavior of nanocrystalline metals and alloys[J].Acta materialia,200319(19):5743-5774. |
| [2] | 刘刚;雍兴平;卢柯.金属材料表面纳米化的研究现状[J].中国表面工程,2001(3):1-5. |
| [3] | Valiev RZ.;Alexandrov IV.;Islamgaliev RK..Bulk nanostructured materials from severe plastic deformation [Review][J].Progress in materials science,20002(2):103-189. |
| [4] | Charles S. Montross;Tao Wei;Lin Ye.Laser shock processing and its effects on microstructure and properties of metal alloys: a review[J].International Journal of Fatigue,200210(10):1021-1036. |
| [5] | Wang Ting;Wang Dongpo;Liu Gang;Gong Baoming;Song Ningxia.Investigations On The Nanocrystallization Of 40cr Using Ultrasonic Surface Rolling Processing[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,20085P1(5P1):1824-1829. |
| [6] | Y.-K. Gao;F. Lu;Y.-F. Yin.Effects of shot peening on fatigue properties of 0Cr13Ni8Mo2Al steel[J].Materials Science and Technology: MST: A publication of the Institute of Metals,20033(3):372-374. |
| [7] | 高玉魁.喷丸对Ti-10V-2Fe-3Al钛合金拉-拉疲劳性能的影响[J].中国有色金属学报,2004(01):60-63. |
| [8] | J.Z. Lu;K.Y. Luo;Y.K. Zhang.Grain refinement of LY2 aluminum alloy induced by ultra-high plastic strain during multiple laser shock processing impacts[J].Acta materialia,201011(11):3984-3994. |
| [9] | K.Y. Zhu;A. Vassel;F. Brisset.Nanostructure formation mechanism of alpha-titanium using SMAT[J].Acta materialia,200414(14):4101-4110. |
| [10] | I. Altenberger;E. A. Stach;G. Liu;R. K. Nalla;R. O. Ritchie.An in situ transmission electron microscope study of the thermal stability of near-surface microstructures induced by deep rolling and laser-shock peening[J].Scripta materialia,200312(12):1593-1598. |
| [11] | Z.P. Luo;H.W. Zhang;N. Hansen.Quantification of the microstructures of high purity nickel subjected to dynamic plastic deformation[J].Acta materialia,20123(3):1322-1333. |
| [12] | Liu, W.;Wu, G.;Zhai, C.;Ding, W.;Korsunsky, A.M..Grain refinement and fatigue strengthening mechanisms in as-extruded Mg-6Zn-0.5Zr and Mg-10Gd-3Y-0.5Zr magnesium alloys by shot peening[J].International Journal of Plasticity,2013:16-35. |
| [13] | Y. Estrin;A. Vinogradov.Extreme grain refinement by severe plastic deformation: A wealth of challenging science[J].Acta materialia,20133(3):782-817. |
| [14] | 李宁;夏伟;赵婧;李风雷.滚压诱导超细晶纯铁表层及其耐腐蚀性能[J].华南理工大学学报（自然科学版）,2014(9):1-6. |
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