金属学报  1983, Vol. 19 Issue (2): 139-142

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用正电子湮没技术研究裂纹顶端塑性区内的缺陷分布

薛嘉渔;季国坤;田中卓;常香荣;吕荣邦;肖纪美

中国科学院高能物理所;中国科学院高能物理所;北京钢铁学院;北京钢铁学院;北京钢铁学院;北京钢铁学院

POSITRON ANNIHILATION STUDY ON THE DISTRIBUTION OF DEFECTS IN THE PLASTIC ZoNE A-T CRACK TIP

XUE Jiayu; JI Guokun (Institute of High Energy Physics; Academia Sinica; Beijing); TIAN Zhongzhou; CHANG Xiangrong; L(?) Rongbang;XIAO Jimei (Beijing University of Iron and Steel Technology)

薛嘉渔;季国坤;田中卓;常香荣;吕荣邦;肖纪美. 用正电子湮没技术研究裂纹顶端塑性区内的缺陷分布[J]. 金属学报, 1983, 19(2): 139-142.
, , , , , . POSITRON ANNIHILATION STUDY ON THE DISTRIBUTION OF DEFECTS IN THE PLASTIC ZoNE A-T CRACK TIP[J]. Acta Metall Sin, 1983, 19(2): 139-142.

摘要 参考文献 相关文章 Metrics 全文: PDF(320 KB)   摘要: 用楔形加载试样测定了裂纹顶端区正电子湮没多普勒加宽谱的S参数,并确定了试样充氢以后S参数的变化。经过标定,定出塑性区内的等应变曲线。充氢以后,使塑性内的等应变曲线向外扩展,在最大切应力方向发展最快。作者认为氢使塑性区内的位错增殖或可动位错滑移,同时产生空位。 Abstract：The plastic zone of crack tip of wedge opening loading specimens were studied by positron annihilation technique. The line-shape parameters of Doppler broadening of annihilating radiation were measured. The value of S parameters was calibrated by specimens with known amount of strain. Then the distribution of the plastic strain in the plastic zone as a measure of the density of defects was determined. Experimental results indicate:1. The dimension of plastic zone is exactly the same as that determined by fracture mechanics.2. The distribution of strain in the plastic zone is not homogeneous.3. There is a high strain area at the very tip of the crack.4. The strain in the plastic zone is increased after electrochemical hydrogenation. Iso-strain curves are expanded preferentially in the direction of greatest shear stress. It is concluded that hydrogen facilitates the propagation of dislocations or the sliding of movable dislocations and vacancies can generate at the same time. 收稿日期: 1983-02-18      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 薛嘉渔 季国坤 田中卓 常香荣 吕荣邦 肖纪美 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1983/V19/I2/139 1 Seeger, A.; J. Phys., F: Met. Phys., 3 (1973) , 248． 2 Nieminen, R. M.; Manninen, M. J., Positrons in Solids, Springer-Verlag, Berlin 1979, p. 145． 3 季国坤;刘年庆;王淑英;姜健;熊良钺;龙期威,金属学报,17(1981) ,677． 4 堂山昌男;山田 裕;福岛 博,铁鋼,61(1975) ,s234． 5 Alex, F.; Hadnagy, T. D.; Lynn, K. G.; Byrne, J. G., Effect of Hydrogen on Behavior of Materials, Pro. Int. Conf. on Effect of Hydrogen on Behavior of Materials, Ed. Thompson, A. W.; Bernstein, I. M., The Metallurgical Society of AIME, U. S. A., 1976． p. 642． 6 Chu, W. Y.; Hsiao, C. M.; Li, S. Q., Advances in Fracture Research, Pro. 51h Int. Conf. on Fracture, Ed. D. Francois, Vol. 2, Pergamon, 1981, p. 1009． 7 Chu, W. Y.; Hsiao, C. M.; Li, S. Q., Scr. Metall., 13 (1979) , 1063．H No related articles found! Viewed Full text Abstract Cited   Shared      Discussed