金属学报  1995, Vol. 31 Issue (2): 90-9

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单晶Nb循环变形过程中疲劳裂纹的萌生及其机制

吴建生;林栋粱

上海交通大学

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)

吴建生;林栋粱. 单晶Nb循环变形过程中疲劳裂纹的萌生及其机制[J]. 金属学报, 1995, 31(2): 90-9.
, . FATIGUE CRACK INITIATION OF Nb MONOCRYSTALS AND ITS MECHANISM DURING CYCLIC DEFORMATION[J]. Acta Metall Sin, 1995, 31(2): 90-9.

摘要 参考文献 相关文章 Metrics 全文: PDF(541 KB)   摘要: 用光学显微镜、扫描电镜和透射电镜观察了Ｎｂ单晶在循环变形后的表面形貌和饱和时的位错组态．发现疲劳裂纹的萌生和表面形变带有关．当滑移线和形变带方向平行时，在双形变带的公共皱折处很容易萌生疲劳裂纹．已萌生裂纹呈交滑移特征，在裂纹萌生处附近，有很多由交滑移引起的滑移台阶．根据我们的实验结果，从理论上对Ｍｏｔｔ的疲劳裂纹萌生模型进行修正，也为Ｍｏｔｔ模型提供了实验依据 关键词 ： Ｍｏｔｔ模型,  疲劳裂纹萌生,  交滑移,  单晶铌     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 收稿日期: 1995-02-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 吴建生 林栋粱 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/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] 李细锋, 李天乐, 安大勇, 吴会平, 陈劼实, 陈军. 钛合金及其扩散焊疲劳特性研究进展[J]. 金属学报, 2022, 58(4): 473-485. [2] 张飞, 沈健, 闫晓东, 孙建林, 蒋呐, 周华. 2099合金热变形过程中的动态软化机制*[J]. 金属学报, 2014, 50(6): 691-699. [3] 钱桂安 洪友士. 环境介质对40Cr结构钢高周和超高周疲劳行为的影响[J]. 金属学报, 2009, 45(11): 1356-1363. [4] 刘江涛 王中光 尚建库. [110]和[112]取向β-Sn单晶体的形变行为[J]. 金属学报, 2008, 44(12): 1409-1414. [5] 王习术; 梁锋; 曾燕屏; 谢锡善 . 夹杂物对超高强度钢低周疲劳裂纹萌生及扩展影响的原位观测[J]. 金属学报, 2005, 41(12): 1272-1276 . [6] 杨继红; 张新平; Y.W.Mai; 李勇 . 铜单晶循环变形饱和阶段疲劳裂纹萌生及表面区域内应力分布的模拟[J]. 金属学报, 2005, 41(1): 9-. [7] 胡运明;王中光. Cu双晶的循环形变行为与疲劳裂纹萌生Ⅱ.疲劳裂纹萌生与早期扩展[J]. 金属学报, 1997, 33(8): 824-830. [8] 冯忠信;张建中;杨建军;陈新增. 金属材料在循环载荷下塑性变形传播对疲劳性能的影响[J]. 金属学报, 1996, 32(3): 261-264. [9] 王理明;祝东;姚枚;蔡其巩;邹敦叙. TiAl金属间化合物反常应变速率效应的研究[J]. 金属学报, 1992, 28(4): 40-44. Viewed Full text Abstract Cited   Shared      Discussed