高纯铝经等通道转角挤压(Equal Channel Angular Extrusion/Pressing)后,其组织会发生显著变化.采用自制转角为ψ=100°,ψ=16°的挤压模具,在液压试验机上对晶粒直径为1.0mm的退火高纯铝实施挤压.挤压过程中的塑性剪切应变为1.57,平均一次挤压(N=1)的等效塑性应变为0.912.在扫描电镜上利用背散射电子衍射(EBSD)和ECC新分析技术研究了等通道转角挤压对微观组织的影响.实验结果表明,经过一次挤压,许多原始晶界沿剪切变形方向伸直,等轴晶粒变成沿剪切方向排列的片层结构,晶内出现直径约1.0μm的大量亚晶.经过多次挤压的高纯铝试样在室温便出现再结晶,EBSD分析确定再结晶组织中存在立方织构.
参考文献
| [1] | Sega V M .[J].Materials Science and Engineering,1995,A197:157-164. |
| [2] | Wang J;Iwahashi Y;Horita Z.[J].Journal of Materials Research,1993:2810-2818. |
| [3] | Valiev R Z;Kozlov E V;Ivanov Y F .[J].Acta Metallurgica Et Materialia,1994,42:2467-2475. |
| [4] | Ferrasse S;Segal V M;Hartwig K T et al.[J].Metallurgical and Materials Transactions,1997,28A:1047-1057. |
| [5] | Wang J;Iwahashi Y;Horita Z.[J].冶金材料学报,1996:2973-2982. |
| [6] | Furukawa M;Iwahashi Y;Horita Z et al.[J].Acta Metallurgica Et Materialia,1997,45:4751-4757. |
| [7] | Furukawa M;Bernon P B;Horita Z et al.[J].Metallurgical and Materials Transactions,1998,29A:169-177. |
| [8] | Iwahashi Y;Horita Z;Nemoto M .[J].Acta Metallurgica Et Materialia,1997,45:4733-4741. |
| [9] | Nakashaima K;Horita Z;Nemoto M .[J].Acta Metallurgica Et Materialia,1998,46:1589-1599. |
| [10] | Iwahashi Y;Horita Z;Nemoto M .[J].Acta Metallurgica Et Materialia,1998,46:3317-3331. |
| [11] | Segal V M;Hartwig K T;Goforth R E .[J].Material Science and Engineering,1997,224A:107-115. |
| [12] | Iwahashi Y;Wang J;Horita Z et al.[J].Scripta Materialia,1996,35:143-146. |
| [13] | Hughes D A;Hansen N .[J].Acta Metallurgica Et Materialia,1997,45:3871-3886. |
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%