Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C
文献类型：期刊论文
| 作者 | Shui Li2; Xu Yunchao2; Hu Zhuangqi1 |
| 刊名 | RARE METAL MATERIALS AND ENGINEERING
 |
| 出版日期 | 2018-04-01 |
| 卷号 | 47期号:4页码:1054-1058 |
| 关键词 | nickel base single crystal superalloy high cycle fatigue dislocation |
| ISSN号 | 1002-185X |
| 通讯作者 | Shui Li(shuilisy@163.com) |
| 英文摘要 | Dislocation structure and its impact on the mechanical behavior of a gamma' strengthened nickel base single crystal alloy under high cycle fatigue (HCF) at 870 degrees C was studied. The results indicate that HCF lifetime declines with increase of applied stress amplitude. In the early stages, the fatigue deformation occurs by forced bowing of dislocations through the narrow gamma matrix channels on {111} planes. During mid-term fatigue stages, most of the dislocations formed in the matrix are located in the gamma/gamma' interfaces, whose intersection and reaction produce new dislocation segments and three-dimensional dislocation networks. The Burgers vectors of the dislocations in the network are 1/2<110>. The interaction of cyclic stress with high temperature induces the precipitation of homogeneous globular gamma' particles, which is beneficial to fatigue strength. At the end of fatigue test, the cyclic stress leads to the formation of persistent slip bands moving through the gamma matrix channels and gamma' particles. Dislocation shearing through the gamma'phase is found occasionally. The extrinsic stacking faults is also observed. |
| 资助项目 | National Natural Science Foundation of China[50171045] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000431601500006 |
| 出版者 | NORTHWEST INST NONFERROUS METAL RESEARCH |
| 资助机构 | National Natural Science Foundation of China |
| 源URL | [http://ir.imr.ac.cn/handle/321006/128039]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Shui Li |
| 作者单位 | 1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Shenyang Ligong Univ, Shenyang 110159, Liaoning, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shui Li,Xu Yunchao,Hu Zhuangqi. Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C[J]. RARE METAL MATERIALS AND ENGINEERING,2018,47(4):1054-1058. |
| APA | Shui Li,Xu Yunchao,&Hu Zhuangqi.(2018).Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C.RARE METAL MATERIALS AND ENGINEERING,47(4),1054-1058. |
| MLA | Shui Li,et al."Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C".RARE METAL MATERIALS AND ENGINEERING 47.4(2018):1054-1058. |
入库方式： OAI收割
来源：金属研究所
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