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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。
The wedge-shaped specimen was used to determine the S parameter of the Doppler-broadening spectrum of positron annihilation in the tip region of the crack and the change of the S parameter after the sample was filled with hydrogen was determined. After calibration, set the plastic zone equal strain curve. Hydrogen charging, so that the plastic strain constant expansion outwards in the direction of the maximum shear stress to develop the fastest. The authors believe that hydrogen causes dislocation propagation or mobile dislocations within the plastic zone to slip while creating vacancies.