关注:

1)  气相渗透测试的N种方法

2)  电化学方法测试渗透的原理

3)  四极质谱的定量技术研究

   材料中氢同位素渗透行为的研究方法有:电化学方法、热解吸方法和气相渗透方法等。其中,气相渗透法是利用试样两侧的压差作用使气体从高压侧渗透到低压侧的过程进行氢渗透行为研究。该过程由于测量精度高成为首选方法。

实验方法-定量

The hydrogen concentrations were measured on testcoupons, or on the specimens after they were studied, using a gas extractionsystem coupled to a gas chromatograph that analyzedthe H₂ evolved from the specimen during heating. The accuracyof this technique is better than 2% of the concentration.

Characterization of the microstructures before and afterhydrogen charging was performed in the JEOL 4000 EX controlled environment transmission electron microscope [14, 15].

In addition to being used for routinecharacterization, this microscope was used to observein real time the effects of solute hydrogen on dislocation mobility and thepropensity for hydride formation.

Particular attention was directed towards propagatingcracks, examining the stress field ahead of the crack for hydride nucleation,and for dissolution of hydrides after the crack had propagated through theregion.

The microscope was operatedat 400 kV; no observable radiation damage or radiation induced defectswere observed during the experiments.

It was established in these and other experiments onTi alloys that hydrogen was introduced from the gas phase as a consequence of the dissociation and ionization of the H₂gas molecules by the electron beam [16].