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NiTi合金相变包括有,过程.这些相变可以彼此分开相继发生,也可以重叠出现. 通常的X射线衍射方法由于不易掌握各相开始出现和消失时刻,特别是在像NiTi合金中几种相变情况下,对结果分析有一定困难.本文采用定角扫描方法研究NiTi合金相变的动力学行为,给出了各相在相变中消长的动态图象,有助于了解NiTi合金相变的特征. 1.实验材料与方法试样直径为1.5mm的NiTi丝,含Ni量为50.3at％.为使相变过程稳定,经973K×1/2hr冰水淬火后在室温至423K进行n=40次的热循环.试样A和B分别对应于无应力σ=0和有应力σ=570MPa下进行热循环. X射线衍射是在日本理学D/MAX-ⅢA衍射仪上进行,采用高温纤维试样附件,
NiTi alloy phase transformation include, process these phase transitions can occur separately from each other can also occur overlap.X ray diffraction method is usually difficult to grasp because of the beginning and disappearance of each phase, especially in the phase like NiTi alloy several phases In the case of variable conditions, it is difficult to analyze the results.In this paper, the dynamic behavior of NiTi alloy phase transformation is studied by using the fixed angle scanning method, and the dynamic images of the phase transformation in the phase change are given, which helps to understand the NiTi alloy phase transformation 1. Experimental Materials and Methods Specimens NiTi wire with a diameter of 1.5mm containing 50.3at% Ni. To stabilize the phase change process, after quenching with ice water at 973K × 1 / 2hr for nTi at room temperature to 423K, = 40 thermal cycles Sample A and B, respectively, corresponding to no stress σ = 0 and stress σ = 570MPa under the heat cycle X-ray diffraction is carried out in Japan Rigaku D / MAX-Ⅲ A diffractometer carried out using high temperature Fiber sample attachment,