【摘要】 测量了四种典型镍镀层的采透火和退火试样的正电子湮没寿命谱。根据实验结果,观察到镀层渗氢,空位缺陷热迁移,镀层的化学聚团作用以及再结晶等重要现象,并对这些现象进行了分析。更多还原

【Abstract】 The Positron lifetime spectra of unannealed and annealed Ni-coats,electro-plated from the four typical baths,have been measured.From the resultingcurves of annihilation Pararnerers vs. annealing temperature, it was found that average lifetime of dull Ni-coats decreased as NaCl instead of NiCl2 was used in the baths,which corresponded to decreasing of residual internal stress of coats and that hydrogen permeated into coats during the electroplating process was absorbed mainly in void-type defects.The important phenomena that the movement of vacancy-like into void-type, resulting in increasing of mean diameter of the latter during the annealing and chemical clustering effects, i.e.nickel sulfide and oxide apeared in bright Ni and dull Ni coats under the annealing temperature about 300 ℃ and 400 ℃, respectively,owing to reactions of Ni with the impurities and recrystalliz-ation occured in 600 ℃ for four samples were also observed.更多还原