在室温条件下对纳米金属镍进行了不同程度的冷轧变形,利用X射线衍射分析和高分辨透射电镜的观察对纳米金属镍的微观结构演变以及塑性变形机制进行了研究.结果表明:形变量ε< 20%时,晶粒旋转为主要的变形方式;当20%<ε<30%时,位错活动与晶粒旋转共同协调变形;ε>30%时,晶界发射的不全位错,形成变形孪晶与层错,主导变形.
Nanocrystalline nickel was cold-rolled with different strain at room temperature.Microstructure evolution and plastic deformation mechanism of nanocrystalline nickel were examined by means of high-reaolution transmission electronic microscope(HRTEM) and X-ray diffraction (XRD).The results show that when the strain ε< 20%, deformation is dominated by grain rotation.When 20% <ε< 30% ,full dislocation slip and grain rotation realizes the deformation.When ε> 30%, partial dislocation generated from GBs leads to twinning and stacking faults, dominating the deformation.
参考文献
| [1] | M.A. Meyers;A. Mishra;D.J. Benson .Mechanical properties of nanocrystalline materials[J].Progress in materials science,2006(4):427-556. |
| [2] | Wu X L;Zhu Y T;Chen M W et al.Twinning and stacking fault formation during tensile deformatian of nanocrystalline Ni[J].Scripta Materialia,2006,54(09):1685-1689. |
| [3] | Swygenhoven H Van;Derlet P M;Fr(o)seth A G .Stacking fault energies and slip in nanocrystalline metals[J].Nature Materials,2004,3:399-3403. |
| [4] | D. Farkas;A. Fraseth;H. Van Swygenhoven .Grain boundary migration during room temperature deformation of nano- crystalline Ni[J].Scripta materialia,2006(8):695-698. |
| [5] | Brandstetter S;Zhang K;Escuadro A et al.Grain coarsening during compression of bulk nanocrystalline nickel and copper[J].Scripta Materialia,2008,58(01):61-664. |
| [6] | D.A.Huges;N.Hansen .Microstructure and strength of nickel at large strains[J].Acta materialia,2000(11):2985-3004. |
| [7] | 张喜燕,武小雷,左汝林,夏宝玉,周明哲.变形过程中纳米金属镍的微结构演变[J].中国有色金属学报,2005(10):1607-1611. |
| [8] | Dalla Tone F;Swygenhoven H Van;Victoria M .Nanoerystalline electro-deposited Ni:microstructure and tensile propertics[J].Acta Materialia,2002,50(15):3957-33970. |
| [9] | Gianola DS;Petegem S Van;Legros M et al.Stress-assisted discontinuans grain growth ond its effect on the deformation behavior of nanocrystalline aluminum thin films[J].Acta Materialia,2006,54(08):2253-22263. |
| [10] | Shan Z W;Stech E A;Wiezorek J M K et al.Grain boundary mediated plasticity in nanoerystolline Nickel[J].Science,2004,305(5684):654-657. |
| [11] | Mureyama M;Howe J M;Hidaka H et al.Atomic-level observation of dislocation dipoles in mechanically milled Nanoerystalline Fe[J].Science,2002,295(5564):2433-22435. |
| [12] | Marc Legros;Daniel S. Gianola;Kevin J. Hemker .In situ TEM observations of fast grain-boundary motion in stressed nanocrystalline aluminum films[J].Acta Materialia,2008(14):3380-3393. |
| [13] | Swygenboven H Van;Derlet P M .Atomic mechanism for dislocation emission from nanosized grain boundaries[J].Physical Review B,2002,66:02410. |
| [14] | Zhu Y T;Liao X Z;Srinivasan S G et al.Nucleation of deformation twins in nanocrystalline face-centerd-cubic metals processed by severe plastic deformation[J].Journal of Applied Physics,2005,98:034319. |
| [15] | Zhang XY;Wu XL;Xia BY;Zhou MZ;Zhou SJ;Jia C .Step structure in cold-rolled deformed nanocrystalline nickel[J].Chinese physics letters,2005(9):2335-2337. |
| [16] | Wu X L;Zhu Y T .Partial-dislocation-mediated processes in nanocrystelline Ni with nonequilibrium grain boundaries[J].Applied Physics Letters,2006,89:031922. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%