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Electric resistance monitoring as a method for controlling shape memory alloy characteristics during shape-setting treatments in the furnace

机译：电阻监测作为在炉子定型处理过程中控制形状记忆合金特性的方法

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This paper proposes a method, based on electric resistance, for monitoring online the shape-setting of NiTi shape memory alloys during thermal treatments in the furnace. The experimental part includes straight-annealing experiments of 1 mm Ni-rich NiTi wires with different cold-working degrees (0%, 25%, 30% and - 40% CW series) or at various ageing temperatures (708 K, 748 K, 808 K, 853 K, and 893 K - T series). Furthermore shape-setting experiments of Ω springs at 708 K are reported. A test current was injected into each specimen during ageing and the resulting tension was measured continuously over a set length of material, initially for 1800 s. The resulting curves were repeatable and showed an initial drop in voltage, followed by a definite rise, a plateau and a long slow decrease. These epochs are connected to critical latencies that were used to set the durations of subsequent shape-setting experiments of separate samples in the CW and T series. Mechanical tensile tests, DSC, XRD measurements and FEG-SEM analyses were carried out on all specimens. Correlations were established between electric resistance curve latencies, mechanical performance and microstruc-tural evolution in the material. In particular, the point at the end of the plateau region appears to mark optimal pseudoelastic behaviour. This method may improve the efficiency of parameter optimisation in shape memory alloys processing.
机译：本文提出了一种基于电阻的在线监测NiTi形状记忆合金在炉内热处理过程中形状设定的方法。实验部分包括具有不同冷加工度（0％，25％，30％和-40％CW系列）或在各种时效温度（708 K，748 K， 808 K，853 K和893 K-T系列）。此外，还报告了708 K时Ω弹簧的定型实验。在老化过程中，向每个样品注入测试电流，并在设定的材料长度上连续测量所产生的张力，最初为1800 s。所得的曲线是可重复的，并显示出电压的初始下降，然后是确定的上升，平稳和长期缓慢的下降。这些时期与关键潜伏期有关，这些潜伏期用于设置CW和T系列中单独样本的后续形状设置实验的持续时间。在所有样品上进行了机械拉伸试验，DSC，XRD测量和FEG-SEM分析。在材料的电阻曲线潜伏期，机械性能和微观结构演变之间建立了相关性。特别是，高原区域末端的点似乎标志着最佳的伪弹性行为。该方法可以提高形状记忆合金加工中参数优化的效率。

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