用自制的恒位移试样在TEM中原位研究了充氢前后位错组态的变化以及氢致微裂纹形核和位错运动及无位错区（DFZ）的关系．结果表明，氢能促进位错发射、增殖和运动．当氢促进的位错发射和运动达到临界条件时，氢致裂纹就在DFZ中或原缺口顶端形核．这个过程和空气中原位拉伸相类似，但氢的存在使得在较低的外应力下氢致裂纹就能形核．
A special deflection device for TEM has designed and used to study the dislocation configuration change before and after recharging hydrogen. The relations among hydrogenfated microcrack initiation, dislocation motion and dislocation free zone (DFZ) were also studied. The results showed that hydrogen can promote dislocation emission and motion. When the dislocation emission and motion develop to a critical condition, hydrogen-facilitated microcrack will initiate in DFZ or at the top of the ored. This process is similar to that during tensile testing in the air.
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