Abstract The high temperature resistance behaviour of the TiNi shape memory alloy (SMA) B19′→B2 phase transformation zone was investigated in TiNi alloy powder. The powder samples were subjected to cyclic thermal treatment in air. Firstly, the TiNi alloy powders were annealed at 500 °C, 600 °C, 700 °C and 800 °C for 6 h in air. On another study, the TiNi alloy powder was annealed at 400 °C for 30 h, 60 h, 90 h and 120 h, respectively. The results shows that annealing the powder above 500 °C suppresses the B19’→B2 phase transformation. On the other hand, the B19’→B2 phase transformation was visible on the 30 h, 60 h, 90 h and 120 h samples annealed at 400 °C. Surface morphologies analyses of the TiNi alloy powders were investigated using a high-resolution scanning electron microscope (HR-SEM, Auriga ZEISS), while the thermal analysis was carried out using DSC in NETZSCH STA.

中文翻译：

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使用合金粉末研究 TiNi 形状记忆合金在 B19′→B2 相变上的耐热性能

摘要 研究了TiNi 合金粉末中TiNi 形状记忆合金(SMA) B19'→B2 相变区的耐高温行为。粉末样品在空气中进行循环热处理。首先，TiNi合金粉末在空气中在500°C、600°C、700°C和800°C下退火6小时。在另一项研究中，TiNi 合金粉末分别在 400°C 下退火 30 小时、60 小时、90 小时和 120 小时。结果表明，在 500 °C 以上对粉末进行退火抑制了 B19'→B2 相变。另一方面，在 400 °C 下退火 30 小时、60 小时、90 小时和 120 小时的样品上可以看到 B19'→B2 相变。使用高分辨率扫描电子显微镜（HR-SEM，Auriga ZEISS）研究了 TiNi 合金粉末的表面形貌分析，