| 金属陶瓷热冲击疲劳裂纹形成机制 |
| |
| 引用本文： | 刘宁,徐根应,许育东,李健,胡镇华,崔昆.金属陶瓷热冲击疲劳裂纹形成机制[J].复合材料学报,1998,15(2):36-41. |
| |
| 作者姓名： | 刘宁 徐根应 许育东 李健 胡镇华 崔昆 |
| |
| 作者单位： | 1.合肥工业大学北区材料系, 合肥 230069; |
| |
| 基金项目： | 国家教委“八五”重点科研项目,安徽工学院基金 |
| |
| 摘 要： | 研究了金属陶瓷热冲击疲劳特性, 重点探讨了裂纹的形成机制。试验结果表明, 随着循环温度的增高, 裂纹形核孕育期缩短, 裂纹扩展速率增大; 随着金属陶瓷中金属相含量的增加, 裂纹扩展速率降低。热冲击疲劳裂纹的形成与微孔洞的形核、长大和连通有关。研究还发现, 金属陶瓷热冲击疲劳断口中存在疲劳条纹。
|
| 关 键 词： | 金属陶瓷 热冲击疲劳 裂纹形核机制 疲劳条纹 |
FORMATIVE MECHANISM OF THERMAL SHOCK FATIGUE CRACK OF CERMETS |
| |
| Liu Ning,Xu Genying,Xu Yudong,Li Jian,Hu Zhenhua,Cui Kun.FORMATIVE MECHANISM OF THERMAL SHOCK FATIGUE CRACK OF CERMETS[J].Acta Materiae Compositae Sinica,1998,15(2):36-41. |
| |
| Authors: | Liu Ning Xu Genying Xu Yudong Li Jian Hu Zhenhua Cui Kun |
| |
| Affiliation: | 1.Hefei University of Technology, Hefei 230069;2.Research Institute of Machinery Science and Technology;3.Huazhong University of Science and Technology |
| |
| Abstract: | The thermal shock fatigue character of cermets has been studied and the formative mechanism of crack discussed in detail. The results have shown that the incubation period of crack nucleation decreases and the propagation rate of crack increases with increasing the cyclic temperature. The propagation rate of crack also decreases with increasing the binder content of cermets. The crack formation of thermal shock fatigue is related to the nucleation, growth and join of microvoid. The SEM has also denoted that there are some fatigue striae on the fracture surfaces. |
| |
| Keywords: | cermets thermal shock fatigue formative mechanism of crack fatigue stria |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《复合材料学报》浏览原始摘要信息 |
|
点击此处可从《复合材料学报》下载全文 |
|
