In this study, we analyze the influences of carbon nanotube (CNT) addition on the martensite transformation and internal friction of Cu–Al–Ni shape-memory alloys (SMAs). X-ray diffraction and differential scanning calorimetry results demonstrate that Cu–13.5Al–4Ni–xCNT (x = 0, 0.2, 0.4, 0.6, and 0.8 wt%) SMA/CNT composites exhibit a \({\upbeta }_{1}({\mathrm{DO}}_{3})\rightleftarrows {\upbeta }_{1}^{\mathrm{^{\prime}}}(18\mathrm{R})\) martensitic transformation. The martensitic transformation temperatures and transformation enthalpies of the martensitic transformation peaks for the Cu–13.5Al–4Ni–xCNT (x = 0–0.8 wt%) composites gradually decrease with the increase in the amount of CNT addition. Compared to the Cu–13.5Al–4Ni SMA, the Cu–13.5Al–4Ni–xCNT (x = 0.2–0.8 wt%) SMA/CNT composites exhibit significant improvements in the amount of dissipation of energy (storage modulus (\({E}^{\prime}))\) and mechanical strength. However, the tan δ of the internal friction peak gradually decreases with the increase in the CNT content above 0.6 wt%. The reduction in tan δ is attributed to the decrease in the magnitude of the austenite-to-martensite transformation and precipitation of γ₂ (Cu₉Al₄) phase particles, which impede the interface motion in between the parent/martensitic phase and martensitic phase.

在这项研究中，我们分析了碳纳米管（CNT）的添加对Cu-Al-Ni形状记忆合金（SMA）马氏体转变和内摩擦的影响。 X 射线衍射和差示扫描量热法结果表明，Cu–13.5Al–4Ni– x CNT ( x = 0、0.2、0.4、0.6 和 0.8 wt%) SMA/CNT 复合材料表现出\({\upbeta }_{ 1}({\mathrm{DO}}_{3})\rightleftarrows {\upbeta }_{1}^{\mathrm{^{\prime}}}(18\mathrm{R})\)马氏体相变。 Cu-13.5Al-4Ni- x CNT ( x = 0-0.8 wt%) 复合材料的马氏体转变温度和马氏体转变峰的转变焓随着 CNT 添加量的增加而逐渐降低。与 Cu–13.5Al–4Ni SMA 相比，Cu–13.5Al–4Ni– x CNT ( x = 0.2–0.8 wt%) SMA/CNT 复合材料在能量耗散量（储能模量 ( \( {E}^{\prime}))\)和机械强度。然而，随着CNT含量增加到0.6wt%以上，内耗峰的tanδ逐渐减小。 tan δ的降低归因于奥氏体到马氏体相变程度的降低以及 γ ₂ (Cu ₉ Al ₄ ) 相颗粒的析出，这阻碍了母体/马氏体相和马氏体相之间的界面运动。