Acta Metall Sin  1995, Vol. 31 Issue (2): 90-9    DOI:

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FATIGUE CRACK INITIATION OF Nb MONOCRYSTALS AND ITS MECHANISM DURING CYCLIC DEFORMATION

WU Jiansheng; LIN Dongliang(Shanghai Jiaotong University;200030)(Manuscript received 94-03-07)

WU Jiansheng; LIN Dongliang(Shanghai Jiaotong University;200030)(Manuscript received 94-03-07). FATIGUE CRACK INITIATION OF Nb MONOCRYSTALS AND ITS MECHANISM DURING CYCLIC DEFORMATION. Acta Metall Sin, 1995, 31(2): 90-9.

Abstract References Related Articles Recommended Metrics Download:  PDF(541KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The optical microscopy, SEM and TEM have been used to observe the morphological changes at the surface of fatigued Nb monocrystals and the saturated dislocation structure. It reveals that fatigue crack initiation is related to the deformation band at the spcimen surface and cracks initiate easily at the common fold area of the double deformation bands if the slip lines and deformation band are paralled to each other. It is also found that the initiated cracks show the behaviour of cross slips and the steps due to cross slips locate mostly in the vicinity of the initiated cracks. Based on our experimental results, a mechanism.which is the modification of the famous Mott model, is given to theoretically explain the initiation of fatigue cracks. In other words. the experimental results confirm the Mott model in general .Correspondent: WU Jiansheng professor, (Department of Materials Science, Shanghai Jiaotong University.Shanghai 200030) Key words:  Mott model.initiation of fatigue crack      cross slip      Received:  18 February 1995      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1995/V31/I2/90 1CottrellAH,HullD．ProRoySoc,1957;A242:2112MottNT,ActaMetall,1958:6:1953林栋梁,吴建生,陈贤芬．金属学报,1989;25:A7214吴建生,林栋梁．金属学报,1994;30:A1875林栋粱,吴建生．金属学报,1988;24:A766夏月波,王中光．金属学报,1992;28:A517胡赓祥,钱苗根．金属学．上海:上海科学技术出版社,1980:27 [1] ZHANG Fei, SHEN Jian, YAN Xiaodong, SUN Jianlin, JIANG Na, ZHOU Hua. DYNAMIC SOFTENING MECHANISM OF 2099 ALLOY DURING HOT DEFORMATION PROCESS[J]. 金属学报, 2014, 50(6): 691-699. [2] LIU Jiangtao;WANG Zhongguang;SHANG Jianku. DEFORMATION BEHAVIORS OF [110] AND [112]　ORIENTED β-Sn SINGLE CRYSTALS[J]. 金属学报, 2008, 44(12): 1409-1414. No Suggested Reading articles found! Viewed Full text Abstract Cited   Shared      Discussed