Influence of Silver nanoparticles addition on the phase transformation, mechanical properties and corrosion behaviour of Cu-Al-Ni shape memory alloys
Influence of Silver nanoparticles addition on the phase transformation, mechanical properties and corrosion behaviour of Cu-Al-Ni shape memory alloys
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DOI：
10.1016/j.jallcom.2014.05.173
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发表时间：
2014-11-05
影响因子：
6.2
通讯作者：
Taheri, M. M.
中科院分区：
文献类型：
--
作者：
Saud, Safaa N.;Hamzah, E.;Taheri, M. M.
建议将银纳米颗粒掺入铜基形状记忆合金中，以增强其相变行为。然而，这种掺入会影响它们的转变温度、机械、微观结构和腐蚀特性。通过计算机辅助冷却曲线热分析在凝固过程中的导数曲线上检测到四种不同的相反应β、α、NiAl和γ(2)。根据牛顿基线法计算母相 (β) 的最高固体分数 (82%)。利用场发射扫描电子显微镜、X射线衍射拉伸试验和形状记忆效应试验研究了微观结构变化和力学性能。结果发现，Ag的添加可以控制相形貌和取向以及富Ag析出相的形成，从而提高抗拉强度、伸长率、断裂应力应变、屈服强度和形状记忆效应。值得注意的是，形状恢复率达到了原始形状的约80%。通过电化学测试，研究了 Cu-Al-Ni 形状记忆合金在 NaCl 溶液中的腐蚀行为，结果表明，添加 0.25 wt.% Ag 后，Cu-Al-Ni SMA 的腐蚀电位（E-corr）从 -307.4 m V-SCE 向惰性方向移动，从 -307.4 m V-SCE 移至 -277.1 m V-SCE。 (C) 2014 Elsevier B.V. 保留所有权利。
Incorporation of silver nanoparticles into Cu-based shape memory alloys is recommended to enhance their phase transformation behaviour. However, this incorporation can affect their transformation temperatures, mechanical, microstructural and corrosion characteristics. Four different phase reactions beta, alpha, NiAl and gamma(2) were detected on a derivative curve during the solidification by-computer-aided cooling curve thermal analysis. The highest fraction solid (82%) was calculated for the parent phase (beta) based on the Newtonian baseline method. The microstructural changes and mechanical properties were investigated using field emission scanning electron microscopy, X-ray diffraction tensile test and shape memory effect test. It was found that the addition of Ag can control the phase morphology and orientations along with the formation of the Ag-rich precipitates, and thus the tensile strength, elongation, fracture stress-strain, yield strength and shape memory effect are improved. Remarkably, the shape recovery ratio reached approximately 80% of the original shape. The corrosion behaviour of the Cu-Al-Ni shape memory alloy were investigated using electrochemical tests in NaCl solution and their results showed that the corrosion potential (E-corr) of Cu-Al-Ni SMA is shifted towards the nobler direction from -307.4 to -277.1 m V-SCE with the addition of 0.25 wt.% Ag. (C) 2014 Elsevier B.V. All rights reserved.