NiTiCu Shape Memory Alloys with Ultra-Low Phase Transformation Range as Solid-State Phase Change Materials
NiTiCu Shape Memory Alloys with Ultra-Low Phase Transformation Range as Solid-State Phase Change Materials
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DOI：
10.1016/j.actamat.2023.119310
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发表时间：
2023-09
期刊：
影响因子：
9.4
通讯作者：
W. Trehern;N. Hite;R. Ortiz-Ayala;K. Atli;D.J. Sharar;A.A. Wilson;R. Seede;A.C. Leff;I. Karaman
中科院分区：
文献类型：
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作者：
W. Trehern;N. Hite;R. Ortiz-Ayala;K. Atli;D.J. Sharar;A.A. Wilson;R. Seede;A.C. Leff;I. Karaman
形状记忆合金(SMA)已被证明是有效的相变材料(PCM)在热能储存(TES)应用。NiTi和NiTiHf SMA表现出了高的TES性能，由PCM品质因数(FOM)量化，但它们在需要较窄工作温度窗口的应用中的使用受到大的整体相变范围(OTR)的限制。本工作研究了NiTiCuSMA作为高FOM和低OtR的相变材料。采用完全析因设计的实验方法，考察了24种NiTiCu的成分。采用真空电弧熔炼的方法制备了成分，并用量热法、热扩散率和密度测量对其相变和热物性进行了表征。与传统相变材料(通常为<；100 106j2K−1S−1M−4)相比，NiTiCu成分的马氏体相变温度在-22°C到84°C之间，并且表现出更大的FOM(250-1051062K−1S−1M−4)，主要优点与更高的密度和更高的导热值相关。此外，与NiTi和NiTiHf SMA(>；50°C)相比，本研究中的NiTiCu成分显示出超低的OtR(12-20°C)，使其能够在较窄的工作温度窗口中使用。还进行了热循环，显示出马氏体相变的极端稳定性，在80次热循环后，相变温度仅相差0.04°C，这是迄今为止报道的SMA文献中最低的。
Shape memory alloys (SMAs) have been demonstrated as effective phase change materials (PCMs) for thermal energy storage (TES) applications. NiTi and NiTiHf SMAs have shown high TES performance, as quantified by PCM figure of merit (FOM) but their use in applications requiring narrow operation temperature windows is limited by large overall phase transformation ranges (OTR). This work investigates NiTiCu SMAs as PCMs with high FOM and low OTR. A full-factorial design of experiments is used to examine 24 NiTiCu compositions. The compositions were fabricated using vacuum arc melting and their phase transformation and thermophysical properties were characterized using calorimetry, thermal diffusivity, and density measurements. The NiTiCu compositions spanned martensitic transformation temperatures between -22 and 84 °C and exhibited greater FOM (250–1050 106J2K−1s−1m−4), compared to traditional PCMs (typically <100 106J2K−1s−1m−4), with major benefits associated with higher density and higher thermal conductivity values. In addition, the NiTiCu compositions in this study show ultra-low OTR (12–20 °C) compared to NiTi and NiTiHf SMAs (>50 °C), enabling utility in narrow operating temperature windows. Thermal cycling was also performed revealing extreme stability of martensitic transformation with only 0.04 °C shift in transformation temperatures after 80 thermal cycles, which is the lowest reported to date in SMA literature.