Open AccessINVESTIGATION ON THE DEFECTS IN THE POST-DEFORM- ATION HYDROGEN-CHARGED POLYCRYSTALLINE PURE Co BY POSITRON ANNIHILATION
Author(s) -
DongLiang Peng,
Tianmin Wang,
Tong Zhi-Shen
Publication year - 1992
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.41.1106
Subject(s) - vacancy defect , materials science , annealing (glass) , hydrogen , crystallite , positron annihilation , doppler broadening , annihilation , positron lifetime spectroscopy , dislocation , condensed matter physics , positron , atomic physics , molecular physics , spectral line , nuclear physics , metallurgy , electron , physics , composite material , astronomy , quantum mechanics
Using positron lifetime and Doppler broadening lineshape parameter measurements, the recovery behaviors of defects in the deformed and post-deformation hydrogen-charged poly-crystalline pure Co have been studied. Experimental results indicate that the cathodic hydrogen-charging of deformed sample further introduce an additional amount of dislocations and vacancies as well as some vacancy clusters into it. However, it appears that mirrovoids and microcracks are not produced. The recovery temperature range of vacancies is 73-260℃; the annealing of dislocations and vacancy clusters occur in the range of 350-670℃. The migration activation energy of vacancy was measured to be 1.09±0.07eV.