变形过程中纳米金属镍的微结构演变
Microstructure evolution of nanocrystalline nickel after cold-rolled deformation
查看参考文献23篇
|
文摘
|
利用透射电镜对冷轧变形所致纳米结构金属镍的微结构组织演变特征进行了研究。结果表明，经过轧制变形后，纳米晶的平均晶粒尺寸为50-70mm，有少量位错结构，但没有发现位错堆积缠结；在晶界处及附近有台阶界面结构，以及与台阶形状相对应的应力场衬度。在变形后期，可以靠晶界发射不全位错从而促使层错生成，并依赖层错尺寸长大（即层错界面位错）的运动进行。而当层错尺寸长大时，其前沿局部变形应力逐渐变大，直至该应力大到一定值时，位错停止运动，层错尺寸也不再长大，并留下了台阶结构。 |
|
其他语种文摘
|
The microstructures characteristics of the cold-rolled deformed nanocrystalline Nickel metal were studied by transmission electron microscopy （TEM）. The results show that, after cold-rolled deformation, the average grain size is about 50 - 70 nm. Few of dislocations are found in the deformed microstructure. There are step structures in the grain boundary （GB） and neighborhood area, and the contrast of stress field ahead of the step corresponds to the step in the shape. In the late stage of the deformation, with the grain size growing up, the grain boundary can emit partial dislocations. The partial dislocations promote the creation of stack faults, and the size of the stack faults grows up with the gliding of the partial dislocation, so, it is easy to realize the deformation. When the size of stack dislocations grows up, the local deformation stress ahead of the step gradually become big. When this stress reaches a critical value, the gliding of the partial dislocations stops, the stack faults will stop growing up and leave the step structure behind. |
|
来源
|
中国有色金属学报
,2005,15(10):1607-1611 【核心库】
|
|
关键词
|
纳米晶体
;
微观结构
;
塑性变形
;
层错
;
位错
;
变形过程
;
纳米结构
;
金属镍
;
结构演变
;
平均晶粒尺寸
|
|
地址
|
1.
广西大学物理科学与工程技术学院, 广西, 南宁, 530004
2.
中国科学院力学所, 非线性力学国家实验室, 北京, 100080
3.
重庆大学材料科学与工程学院, 重庆, 300044
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1004-0609 |
|
学科
|
一般工业技术;金属学与金属工艺 |
|
基金
|
国家自然科学基金资助项目
|
|
文献收藏号
|
CSCD:2177963
|
参考文献 共
23
共2页
|
|
1.
Legros M. Microsample tensile testing of nanocrystalline metals[J].
Phillos Mag A,2000,80:1017-1026
|
被引
15
次
|
|
|
|
|
2.
van Swygenhoven H. mechanical properties of fully dense nanocrystalline metals [J].
Scripta Materialia,2003,49:625-627
|
被引
7
次
|
|
|
|
|
3.
Chen M. Deformation twinning in nanocrystalline aluminum [J].
Science,2003,300:1275-1277
|
被引
30
次
|
|
|
|
|
4.
Kumar K S. Deformation of electrodeposited nanocrystalline nickel [J].
Acta Mater,2003,51:387-405
|
被引
45
次
|
|
|
|
|
5.
Wang Y. High tensile ductility in a nanostructured metal[J].
Nature,2002,419:912-914
|
被引
83
次
|
|
|
|
|
6.
Sort J. Microstructural effects and large microhardness in cobalt processed by high pressure torsion consolidation of ball milled powders[J].
Acta Mater,2003,51:6385-6393
|
被引
5
次
|
|
|
|
|
7.
Lu L. Superplastic extensibility of nanocrystalline copper at room temperature[J].
Science,2000,287:1463-1466
|
被引
112
次
|
|
|
|
|
8.
Cai B. Creep behavior of cold-rolled nanocrystalline pure copper [J].
Scripta Mater,2001,45:1407-141
|
被引
7
次
|
|
|
|
|
9.
Kumar K S. Deformation of electrodeposited nanocrystalline nickel[J].
Acta Mater,2003,51:387-405
|
被引
45
次
|
|
|
|
|
10.
Hugo R C. In-situ TEM tensile testing of DC magnetron sputtered and pulsed laser deposited Ni thin films[J].
Acta Mater,2003,51:1937-1943
|
被引
7
次
|
|
|
|
|
11.
Budrovic Z. Plastic deformation with reversible peak broadening in nanocrystalline nickel[J].
Science,2004,304:273-276
|
被引
29
次
|
|
|
|
|
12.
Gutkin M Y. Crossover from grain boundary sliding to rotational deformation in nanocrystalline materials[J].
Acta Mater,2003,51:4059-4071
|
被引
12
次
|
|
|
|
|
13.
Fedorov A A. Transformations of grain boundary dislocation pile-ups in nano-and polycrystalline materials[J].
Acta Mater,2003,51:887-898
|
被引
11
次
|
|
|
|
|
14.
Yamakov V. Dislocation-dislocation and dislocation-twin reactions in nanocrystalline Al by molecular dynamics simulation[J].
Acta Mater,2003,51:4135-4147
|
被引
24
次
|
|
|
|
|
15.
van Swygenhoven H. Polycrystalline materials[J].
Science,2002,296:66-67
|
被引
48
次
|
|
|
|
|
16.
Schiψtz J. A maximum in the strength of nanocrystalline copper [ J ].
Science,2003,301:1357-1359
|
被引
1
次
|
|
|
|
|
17.
van Swygenhoven H. Atomic mechanism for dislocation emission from nanosized grain boundaries[J].
Phys Rev B,2002,66:024101
|
被引
7
次
|
|
|
|
|
18.
Derlet P M. Atomistic simulations as guidance to experiments[J].
Scripta Mater,2003,49:629-635
|
被引
7
次
|
|
|
|
|
19.
Froeth A. The influence of twins on the mechanical properties of nc-Al[J].
Acta Mater,2004,52:2259-2268
|
被引
2
次
|
|
|
|
|
20.
Morris D G. Microstructure and strength of nanocrystalline copper alloy prepared by mechanical alloying[J].
Acta Mter,1991,39:1763-1767
|
被引
1
次
|
|
|
|
|
了解气象卫星更多信息，请访问