将自制的25 kg级BaZrO3坩埚用于Ti-55.8％Ni合金（质量分数）的真空感应熔炼，并将合金铸锭经锻造、轧制、拉拔等工序制成φ1.0 mm的TiNi合金丝材，取样经不同的制度热处理后，分析了TiNi合金丝材的拉伸性能、低周弯曲疲劳性能以及拉伸、疲劳断口形貌。结果表明：丝材经700℃保温1 h水淬处理后，延伸率可达23％，韧窝尺寸变小、数量增多，且微孔数量大幅减少。此外，丝材经500℃或550℃保温20 min水淬处理后，疲劳寿命得到提高，最高可达3072次，疲劳断口处贝纹线排列紧密，裂纹较短且部分存在分叉现象。
Ti-55.8 wt%Ni alloy ingot was prepared by vacuum induction melting in 25 kg-grade home-made BaZrO 3 crucible, and the ingot was turned into φ1.0 mm wire by forging, rolling, drawing and etc.For the TiNi wire samples followed by different heat treatments , their tensile properties , low cyclic bending fatigue behaviors , fractographies and fatigue fractography morphologies were analyzed .The results show that , after water quenching at 700 ℃for 1 h, the elongation of samples can reach 23%, and the sizes of dimples become smaller , while the numbers of dimples and micropores are shrink.Besides, after water quenching at 500 ℃ or 550 ℃ for 20 min, the fatigue life of samples is improved, which can reach 3 072 times.Cowrie pattern lines of fatigue fractographies are arrayed closely , and cracks in the matrix are small and part of the cracks are bifurcate .
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