| 查看: 278 | 回复: 8 | |||
| 当前主题已经存档。 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
xucz荣誉版主 (文坛精英)
金属的金属
|
[交流]
【求助完毕】求助语法和句式修改【完结】
|
||
|
Abstract: Ultra-fine grained pure Cu and Cu-Cr alloy were prepared by Equal-channel angular pressing. Their microstructure was tested to investigate the effect of Cr addition on structure evolution. The fine Cr precipitate particles are well dispersed in Cu-Cr alloy, which made its microstructure finer and grain boundaries more poorly-defined than that of pure Cu. But more pressing passes are required to attain a reasonably stable microstructure owing to the Cr precipitations reducing the dislocation mobility. All of those significant changes are due to the trace addition of Cr. Conclusions Ultra-fine grain pure Cu and Cu-Cr alloy were prepared by ECAP, the effect of Cr addition on their microstructure was investigated and discussed in the present work. The results have shown that the trace addition of Cr has an apparent effect on the materials’ microstructure. Due to the low SFE and precipitate strengthening of the metal, the effect of Cr addition in Cu on the microstructure is not as sharp as that of Mg addition in Al; however the effect is still visible. The microstructures of Cu-Cr alloy are finer and the grain boundaries are less defined than those of pure Cu. The mean grain size of pure Cu and Cu-Cr alloy under a stable structure were about ~305 nm and ~230 nm respectively; In addition, more ECAP passes are required in order to attain a reasonably stable microstructure in Cu-Cr alloy. Hardness of Cu-Cr alloy is significantly higher than those of pure Cu. The overlap effects of grain refinement, cold deformation and precipitation strengthening mechanisms, result in further hardness improvement in Cu-Cr alloy. All of those significant changes are due to the trace addition of Cr. [ Last edited by qingshaojun0823 on 2009-9-24 at 09:23 ] |
回复此楼» 猜你喜欢
青椒八年已不青，大家都被折磨成啥样了？
已经有11人回复
-
限项规定
已经有9人回复
-
免疫学博士有名额，速联系
已经有4人回复
-
交叉科学部支持青年基金，对三无青椒是个机会吗？
已经有5人回复
-
国家基金申请书模板内插入图片不可调整大小?
已经有6人回复
-
国家级人才课题组招收2026年入学博士
已经有5人回复
-
Fe3O4@SiO2合成
已经有6人回复
-
青年基金C终止
已经有4人回复
-
26申博求博导推荐-遥感图像处理方向
已经有4人回复
-
西南交通大学国家级人才团队2026年博士研究生招生（考核制）—机械、材料、力学方向
已经有3人回复
xucz
荣誉版主 (文坛精英)
金属的金属
- 应助: 38 (小学生)
- 贵宾: 23.247
- 金币: 57049
- 散金: 29188
- 红花: 254
- 帖子: 20063
- 在线: 3844.2小时
- 虫号: 272964
- 注册: 2006-08-19
- 性别: GG
- 专业: 金属材料
- 管辖: 金属
9楼2009-09-23 13:15:14
xucz
荣誉版主 (文坛精英)
金属的金属
- 应助: 38 (小学生)
- 贵宾: 23.247
- 金币: 57049
- 散金: 29188
- 红花: 254
- 帖子: 20063
- 在线: 3844.2小时
- 虫号: 272964
- 注册: 2006-08-19
- 性别: GG
- 专业: 金属材料
- 管辖: 金属
2楼2009-09-22 14:37:05
3楼2009-09-22 20:45:34
xucz
荣誉版主 (文坛精英)
金属的金属
- 应助: 38 (小学生)
- 贵宾: 23.247
- 金币: 57049
- 散金: 29188
- 红花: 254
- 帖子: 20063
- 在线: 3844.2小时
- 虫号: 272964
- 注册: 2006-08-19
- 性别: GG
- 专业: 金属材料
- 管辖: 金属
4楼2009-09-22 22:06:58