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金属学报  1998, Vol. 34 Issue (12): 1255-1260    
  论文 本期目录 | 过刊浏览 |
垂直晶界和倾斜晶界Cu双晶的疲劳开裂行为及其机制
胡运明;王中光
中国科学院金属研究所材料疲劳与断裂国家重点实验室;沈阳;110015;中国科学院金属研究所材料疲劳与断裂国家重点实验室;沈阳;110015
CYCLIC DEFORMATION BEHMIOR AND FATIGUE CRACK INITIATION IN COPPER BICRVSTALS
HU Yunming;WANG Zhongguang(State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; The Chinese Academyof Sciences; Shenyang 110015)Correspondent; HU Yunming; Tel: (024)23843531-55gg5; Fax: (024)23891s20Manuscript received 1997-12-17; in revised form 1998-01-30
全文: PDF(2499 KB)  
摘要: 用扫描电镜(SEM)研究了一种垂直晶界和两种倾斜晶界Cu双晶的疲劳开裂行为及其机制.这三种双晶组元晶体的取向均为[134].结果表明,沿晶界的疲劳开裂是Cu双晶疲劳破坏的主要形式,但垂直晶界和倾斜晶界双晶疲劳裂纹萌生的机制有所不同.垂直晶界双晶沿晶疲劳裂纹主要由驻留滑移带撞击晶界而产生,而倾斜晶界双晶疲劳裂纹的萌生是由晶界两侧晶粒的滑移台阶而引起的应力集中所致.造成这种差别的原因同两种双晶的活动滑移系与晶界的相对几何关系有关
关键词 Cu双晶晶界疲劳开裂    
Abstract:The fatigue cracking behavior and mechanisms in three types of [34] iso-axialcopper bicrystals have been studied by using scanning electron microscopy (SEM). One bicrystalcontains a grain boundary (GB) perpendicular to the loading direction and the two others containtilting GBs. The experimental results show that the intergranular fatigue cracking is the mainmode in the fatigue failure for the three types of copper bicrystals. However, the fatigue craCkingmechanisms are different for the perpendicular GB bicrystal and the tilting GB bicrystals. Theintergranular fatigue cracks are mainly formed by impingement of persistent slip bands againstthe GB in the perpendicular GB bicrystal. While the fatigue cracking initiation is predominatelydetermined by the stress concentration resulted from steps for the tilting GB bicrystal. The foregoing difference between the fatigue cracking initiation mechanisms in the two types of bicrystalsis closely related to the specimens geometry with respect to the primary slip systems.
Key wordscopper bicrystal    grain boundary    fatigue cracking
     出版日期: 1998-12-18
基金资助:国家自然科学基金!59701006

引用本文:

胡运明;王中光. 垂直晶界和倾斜晶界Cu双晶的疲劳开裂行为及其机制[J]. 金属学报, 1998, 34(12): 1255-1260.
HU Yunming;WANG Zhongguang(State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; The Chinese Academyof Sciences; Shenyang 110015)Correspondent; HU Yunming; Tel: (024)23843531-55gg5; Fax: (024)23891s20Manuscript received 1997-12-17; in revised form 1998-01-30. CYCLIC DEFORMATION BEHMIOR AND FATIGUE CRACK INITIATION IN COPPER BICRVSTALS. Acta Metall Sin, 1998, 34(12): 1255-1260.

链接本文:

http://www.ams.org.cn/CN/      或      http://www.ams.org.cn/CN/Y1998/V34/I12/1255

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