Formation and hydrogen permeability of anisotropic alloys

对Nb-TiNi合金的显微组织进行了控制，研究了Nb-TiNi合金的显微组织与氢渗透率的关系。在较低的温度和/或较短的退火时间下，随着厚度减小，通过重加工制备的各向异性合金中沿法线方向的氢渗透性沿着提高。退火使Nb-TiNi共晶合金的层状组织消失，形成粒状两相组织，氢扩散系数降低，导致合金的氢渗透率降低。

The microstructures of Nb-TiNi alloys consisted of the bcc-(Nb, Ti) and B2-TiNi phases are controlled, and the relation between microstructure and hydrogen permeability is investigated. Hydrogen permeability along the normal direction in an anisotropic alloy prepared by heavy working can be improved at lower temperature and/or shorter annealing period with increasing thickness reduction. Lamellar microstructure of the eutectic Nb-TiNi alloy is disappeared by annealing forming granular two-phase structure, and its hydrogen permeability is reduced, which is caused from a reduction of hydrogen diffusivity.