中文摘要：

开展了Nb-Ti-Ni体系氢分离合金膜的结构和抗弯性能研究。采用XRD/SEM分析了合金膜的结构和组织特征,利用三点弯曲法测定了合金膜的抗弯强度。实验结果表明,制备的Nb-Ti-Ni合金主要由bcc-Nb（Ni,Ti）固溶体和（bcc-Nb（Ni,Ti）＋β2-Ni Ti）共晶相构成,前者是渗氢功能相,后者是结构支撑相。经渗氢实验后,合金试样的抗弯性能均有下降,具有网状结构特征的合金有较好的抗弯性能。经磁场热处理后,合金微结构出现晶粒细化、晶粒沿磁场方向定向排列、固溶体相区分布改变等明显变化,合金膜的抗弯强度有不同程度的改善,其中N7试样经0°和45°磁热处理,N5试样经90°磁热处理,其抗弯性能改善明显,说明通过磁热处理可对合金微结构进行调制,从而提高其抗弯强度。

英文摘要：

The microstructure and the mechanical property of Nb-Ti-Ni alloy membranes for hydrogen permeation were investigated XRD and SEM were employed to characterize the structures of Nb-Ti-Ni alloys, and the bending property of the alloy membranes was measured by three-point bending tests. The results indicate that the as-prepared alloy is mainly composed of two phases, i.e. the primary bcc-Nb（Ni,Ti） solid solution phase, and [bcc-Nb（Ni, Ti）＋fl2-NiTi] eutectic phase. The former acts as functional cell for hydrogen permeation and the later is structural cell to keep the stability of alloy membrane. Mechanical properties of Nb-Ti-Ni alloy membranes have been improved to a certain degree by magnetic heat-treatment （MHT） along the three directions （0°, 45° and 90°）. An obvious improvement has been made in the case of N7 sample by MHT at both of 0° and 45°, and in the case of N5 sample by MHT at 90° angle. MHT can lead to the change of grain sizes and grain orientations. In the case of MHT at 0° angle, a tiny bar-like region （consisting of eutectic phase） is formed and spreads along the direction of membrane surface, while some oral-like （or spot-like） region is regularly arranged on the surface, and the region extends vertically to the surface in the case of MHT at 90° angle It is suggested that suitable MHT is beneficial to the improvement of the bending property of Nb-Ti-Ni alloy membranes.