采用光学显微镜、透射电子显微镜(TEM)、维氏硬度仪和万能材料试验机等手段对 C194合金连续挤压全过程的组织演变与性能特征进行研究。结果表明,C194合金连续挤压过程没有出现明显的动态再结晶组织,仅在直角弯曲后变形区观察到少量沿晶界择优析出的不完全动态再结晶细小晶粒；各变形区硬度随变形量的增加由88．7 HV提升至136．1 HV,并在直角弯曲后变形区增长减缓；挤压前后材料抗拉强度由263 MPa提高到476 MPa,延展性则由26．5％降至18．7％；挤压过程中发生第二相析出,析出物呈现尺寸为60~80 nm 的椭球形和尺寸为10~20 nm且弥散分布的微小颗粒两种形貌。
The microstructure and property development of C194 copper alloy obtained by continuous extrusion forming (CEF ) were investigated with methods of optical microscopy, transmission electron microscopy (TEM),micro-Vickers hardness measurement and universal-testing machine.The results indicate that no mas-sive obvious dynamic recrystallization (DRX)structures are found during the whole CEF process,whereas small amount of incomplete DRX grains are found preferentially precipitated along grain boundaries at after-right-angle bending region.With the increment of plastic deformation,hardness of C194 copper alloy rises from 88.7 HV to 136.1 HV,an increasing rate slowdown occurs at after-right-angle bending region.Tensile strength was drastically promoted from 263 MPa to 476 MPa during CEF process while elongation drops from 26.5% to 18.7%.Second-phase precipitate with morphology of ellipsoid measuring 60-80 nm and micro dispersed particles measuring 10-20 nm,respectively,are found during CEF process.
参考文献
| [1] | 樊志新;陈莉;孙海洋.连续挤压技术的发展与应用[J].中国材料进展,2013(5):276-282. |
| [2] | 张震宇;杨纯宜.铜加工中的连续挤压技术应用[J].世界有色金属,2008(2):17-18. |
| [3] | 孙健;刘平;刘新宽;陈小红;何代华;马凤仓;李伟.Cu-Ni-Si合金连续挤压过程中的组织演变及性能[J].中国有色金属学报,2014(4):944-949. |
| [4] | 隋贤;宋宝韫;李冰;运新兵;高飞.H65黄铜合金连续挤压过程中的组织和性能演变特征[J].中国有色金属学报,2009(6):1049-1054. |
| [5] | 黄晓旭;蔡大勇;姚枚;刘庆;N.Hansen.多晶铜形变显微组织及其再结晶行为[J].中国有色金属学报,2001(1):31-35. |
| [6] | 储灿东;王东哲;彭颖红;阮雪榆.连续挤压成形过程的温度场研究[J].塑性工程学报,2001(1):9-12. |
| [7] | Huang, C.X.;Hu, W.;Yang, G.;Zhang, Z.F.;Wu, S.D.;Wang, Q.Y.;Gottstein, G..The effect of stacking fault energy on equilibrium grain size and tensile properties of nanostructured copper and copper-aluminum alloys processed by equal channel angular pressing[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2012:638-647. |
| [8] | 陈小红;李炎;田保红;康布熙;张毅;刘平.铜基引线框架材料C194合金的析出相研究[J].铸造,2006(5):513-515. |
| [9] | Feng, H.;Jiang, H.;Yan, D.;Rong, L..Effect of continuous extrusion on the microstructure and mechanical properties of a CuCrZr alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2013:219-224. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%