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POSITRON ANNIHILATION STUDY ON DEFORMATION OF HIGH PURITY IRON UNDER DIFFERENT STRAIN RATE

WU YI-CHU TIAN ZHONG-ZHUO CHANG XIANG-RONG XIAO JI-MEI

POSITRON ANNIHILATION STUDY ON DEFORMATION OF HIGH PURITY IRON UNDER DIFFERENT STRAIN RATE

WU YI-CHU, TIAN ZHONG-ZHUO, CHANG XIANG-RONG, XIAO JI-MEI
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Publishing process
  • Received Date:  25 December 1989
  • Accepted Date:  25 March 1991
  • Published Online:  28 June 2005

POSITRON ANNIHILATION STUDY ON DEFORMATION OF HIGH PURITY IRON UNDER DIFFERENT STRAIN RATE

  • 1. 北京科技大学材料物理系,北京,100083

Abstract: Variation of S-parameter with the strain (S-ε curve) under different strain rate are investigated by combining Doppler broadening measurement with slow tensile test. Experimental results are as follows:1. Under slow strain rate, the S-ε curve in high purity iron does not tend to saturation. The slower the strain rate is, the more evident the "non-saturation phenomenon".2. Variations of S-ε curve with strain rate are attributed to the different configuration of dislocation distribution under different strain rates.3. As high purity iron is deformed, the increment of S-parameter depends not only on dislocation density but also on vacancy concentration, and we attibute the so called "non-saturation phenomenon" of S-ε curve to the strain induced vacancies.

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