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| 全层TiAl基合金缺口试样原位拉伸卸载试验的研究 | |
| 引用本文： | 曹睿,朱浩,田载友,张继,陈剑虹.全层TiAl基合金缺口试样原位拉伸卸载试验的研究[J].稀有金属,2006,30(5):586-590. |
| 作者姓名： | 曹睿 朱浩 田载友 张继 陈剑虹 |
| 作者单位： | 1. 兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃,兰州,730050;兰州理工大学材料科学与工程学院,甘肃,兰州,730050 2. 兰州理工大学材料科学与工程学院,甘肃,兰州,730050 3. 钢铁研究总院高温材料研究所,北京,100081 |
| 摘 要： | 通过对TiAl基合金不同类型的缺口试样进行原位拉伸卸载实验和相应的断裂表面观察,研究了TiAl基合金全层组织的断裂机理。研究发现:对于缺口试样,裂纹起裂于缺口根部,其断裂过程主要是主裂纹首先起裂、扩展并最后断裂。在整个断裂过程中断裂是穿层断裂和沿层断裂的混合体,裂纹路径较曲折。在拉伸过程中,试样产生微裂纹导致材料发生损伤,随后卸载再加载时,与先前相比,裂纹更易扩展。预损伤加快了裂纹的产生和扩展,使损伤进一步加重,促使材料抵抗裂纹产生、扩展的能力下降。 |
| 关 键 词： | TiAl基合金 断裂机理 原位拉伸 卸载 |
| 文章编号： | 0258-7076（2006）05-0586-05 |
| 收稿时间： | 2005-12-13 |
| 修稿时间： | 2005-12-132006-02-08 |
In-Situ Tensile-Unload Tests of Fully Lamellar TiAl Alloy Notch Specimens |
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| Cao Rui,Zhu Hao,Tian Zaiyou,Zhang Ji,Chen Jianhong.In-Situ Tensile-Unload Tests of Fully Lamellar TiAl Alloy Notch Specimens[J].Chinese Journal of Rare Metals,2006,30(5):586-590. | |
| Authors: | Cao Rui Zhu Hao Tian Zaiyou Zhang Ji Chen Jianhong |
| Affiliation: | 1. State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China; 2. College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China ; 3. High Temperature Material Research Division, Central Iron and Steel Research Institute, Beijing 100081, China |
| Abstract: | By means of in-situ tensile-unload SEM observation and its corresponding fracture surface observation of different notched specimens of fully lamellar TiAl-based alloys,fracture mechanism of TiAl alloys was investigated.The result of in-situ tensile-unload experiment shows that cracks are initiated directly from the notch for the straight notch specimens,in which the main crack is initiated,propagated and connected by the microcracks.The translamellar fracture and interlamellar fracture are the dominant fracture mode and the crack path is very rough.Microcracks produced in the tensile process can induce damage of materials.With unloading and reloading process,the microcracks are very easy to propagate compared with the former.Pre-damage will accelerate crack initiation and propagation process,and increase the degree of damage.Furthermore,the resistance ability of crack initiation and propagation is decreased. |
| Keywords: | TiAl-based alloys fracture mechanisms in-situ tensile unload |
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