Mechanical Properties of Nb-Ti-Ni Alloy Membranes for Hydrogen Permeation. Issue 6 (June 2016)

• Record Type: Journal Article
• Authors: Huaigang, Zhang; Zhongmin, Wang; Fei, Liu; Jianqiu, Deng; Huaiying, Zhou
• Is Part Of: Xi you jin shu cai liao yu gong cheng. Volume 45:Issue 6(2016)
• Page Start: 1443
• Page End: 1448
• Publication Date: 2016-06
• Subjects: Nb-Ti-Ni alloy membrane -- hydrogen permeation -- magnetic heat treatment (MHT) -- three-point bending test; Nonferrous metals -- Periodicals; 669.05
• DOI: 10.1016/S1875-5372(16)30128-X
• Languages: English
• ISSNs: 1875-5372

Abstract

Abstract: 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)+ β 2-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.