Knowledge Management System of Institue of Mechanics, CAS
| 高压扭转铜试样的微观组织与压缩性能 | |
| Alternative Title | MICROSTRUCTURES AND COMPRESSION PROPER- TIES OF COPPER SPECIMENS DEFORMED BY HIGH-PRESSURE TORSION |
谢子令 ; 武晓雷; 谢季佳; 洪友士
| |
| Source Publication | 金属学报
 |
| 2008-07-11 | |
| Volume | 44Issue:7Pages:803-809 |
| ISSN | 0412-1961 |
| Abstract | 通过高压扭转对铜试样施加不同程度的变形，研究了样品扭转面（ND面）和纵截面（TD面）上微观组织特征．对ND面，在较小的剪应变下，原始晶粒形貌模糊，晶粒内部形成等轴状的位错胞及亚晶结构；随变形量的增大，亚晶间取向差及亚晶内部的位错密度增大，最后形成亚微米尺度的等轴晶粒．对TD面，变形初期原始晶粒被拉长，晶粒内部为位错墙分割成的层状结构，层内为拉长的位错胞；随变形程度的增大，拉长晶粒的宽度减小，与剪切方向的夹角减小，晶内层状组织间距减小，并逐渐演化成拉长的亚晶组织；进一步增大变形，晶粒拉长痕迹消失，变形组织与ND面相似，为等轴状亚微米晶粒．压缩实验表明，经16圈扭转后，整个试样上的压缩性能基本均匀，σ0．2达到385MPa，应变率敏感性指数增大至0．021． |
| Other Abstract | Microstructures of the transverse and longitudinal sections of commercial purity copper deformed by high-pressure torsion (HPT) have been examined by OM and TEM. In the transverse section the deformed microstructure is complex, and dislocation cell structures formed in the original grains at low strain levels. With increasing strain, the dislocation cells continuously transformed into equiaxed subgrains and finally into equiaxed grains with high angle grain boundaries. In the longitudinal section the elongated grains with lamellar submicron structures were observed at low strain levels, and with increasing strain the boundary spacing of the elongated grains as well as their orientation angle with respect to the shear direction decreased. In the lamellar structures some elongated dislocation cells formed and the misorientation between them increased with increasing shear strain. At medium strains the elongated dislocation cells transformed into subgrains, which transformed into individual grains at large strain, and the outline of the lamellar structure disappeared. Compression testing results show that the yield stress and strain rate sensitivity of the HPT treated copper reached 385 MPa and 0.021, respectively. |
| Keyword | 铜 高压扭转 微观结构 晶粒演变 压缩性能 |
| Indexed By | SCI ; CSCD |
| Language | 中文 |
| WOS ID | WOS:000258314600007 |
| CSCD ID | CSCD:3355059 |
| Contributor | 谢子令 |
| Citation statistics |
Cited Times:13[CSCD]
[CSCD Record]
|
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/40484 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | 谢子令 |
| Recommended Citation GB/T 7714 | 谢子令,武晓雷,谢季佳,等. 高压扭转铜试样的微观组织与压缩性能[J]. 金属学报,2008,44,7,:803-809.Rp_Au:谢子令 |
| APA | 谢子令,武晓雷,谢季佳,&洪友士.(2008).高压扭转铜试样的微观组织与压缩性能.金属学报,44(7),803-809. |
| MLA | 谢子令,et al."高压扭转铜试样的微观组织与压缩性能".金属学报 44.7(2008):803-809. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| 246.pdf（1443KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment