|
OALib Journal期刊
ISSN: 2333-9721
费用：99美元
|
|
|
|
高铌TiAl合金在疲劳蠕变作用下的裂纹萌生及扩展
DOI: 10.11900/0412.1961.2014.00346, PP. 1253-1259
Keywords: TiAl合金,疲劳蠕变交互作用,原位观察,裂纹萌生,裂纹扩展
Abstract:
利用SEM原位观察技术研究了近片层Ti-45Al-8Nb-0.2W-0.2B-0.1Y合金在750℃疲劳蠕变交互作用下的裂纹萌生及扩展行为,循环实验采用在最大拉应力保载的梯形波.结果表明,裂纹主要在片层团界面萌生,裂纹萌生方式包括蠕变空洞和疲劳微裂纹.片层团界面处的微裂纹先通过吞并蠕变空洞或在裂纹尖端应力集中作用下沿片层团界面进行扩展,然后相互连接长大;当裂纹扩展受到不同取向的片层团界面阻碍时,受阻的裂纹开始沿试样厚度方向扩展,且附近伴随出现垂直于载荷方向的微裂纹;最终受阻的裂纹相互连接直至合金断裂.将实验结果与该合金在相同条件下疲劳变形和蠕变变形的原位观察结果进行了比较.结合实验结果建立了高铌TiAl合金在疲劳蠕变交互作用下裂纹萌生及扩展示意模型.
| [1] | Gloanec A L, Milani T, Henaff G. Int J Fatigue, 2010; 32: 1015
|
| [2] | Cao R, Lin Y Z, Hu D, Chen J H. Eng Fract Mech, 2008; 75: 4343
|
| [3] | Kim S W, Kumar K S, Oh M H, Wee D M. Intermetallics, 2007; 15: 976
|
| [4] | Mine Y J, Fujisaki H, Matsuda M, Takeyama M, Takashima K. Scr Mater, 2011; 65: 707
|
| [5] | Li X D, Wang X S, Ren H H, Chen Y L, Mu Z T. Corros Sci, 2012; 55: 26
|
| [6] | Wang X S, Yan C K, Li Y, Xue Y B, Meng X K, Wu B S. Int J Fract, 2008; 151: 269
|
| [7] | Wang X S, Fan J H. Int J Fatigue, 2006; 28: 79
|
| [8] | Polak J, Man J, Petrenec M, Tobias J. Int J Fatigue, 2012; 39: 103
|
| [9] | Kim Y W. Acta Metall Mater, 1992; 40: 1121
|
| [10] | Chen G L, Wang X T, Ni K Q, Hao S M, Cao J X, Ding J J, Zhang X. Intermetallics, 1996; 4: 13
|
| [11] | Zhang W J, Deevi S C, Chen G L. Intermetallics, 2002; 10: 403
|
| [12] | Tetsui T. Intermetallics, 2002; 10: 239
|
| [13] | Chen G L, Sun Z Q, Zhou X. Corrosion, 1992; 48: 939
|
| [14] | Kimm D I, Wolfenstine J. Scr Metall Mater, 1994; 30: 615
|
| [15] | Wang J N, Zhu J, Wu J S, Du X W. Acta Meter, 2002; 50: 1307
|
| [16] | Gloanec A L, Jouiad M, Bertheau D, Grange M, Henaff G. Intermetallics, 2007; 15: 520
|
Full-Text
|
|
Contact Us
service@oalib.com QQ:3279437679 
WhatsApp +8615387084133
|
|
