Properties of rare earth added Cu–12wt%Al–3wt%Ni–0.6wt%Ti high temperature shape memory alloy
Properties of rare earth added Cu–12wt%Al–3wt%Ni–0.6wt%Ti high temperature shape memory alloy
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DOI：
10.1016/j.msea.2019.03.022
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发表时间：
2019-04
期刊：
影响因子：
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通讯作者：
P. Dalvand;S. Raygan;G. López;Mariano B. Meléndez;V. Chernenko
中科院分区：
文献类型：
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作者：
P. Dalvand;S. Raygan;G. López;Mariano B. Meléndez;V. Chernenko
本文采用真空电弧熔炼法制备了Cu-12wt % Al-3wt % Ni-0.6wt %Ti + RE高温形状记忆合金，RE为稀土掺杂元素，通过扫描电镜、场发射扫描电镜、透射电镜、室温和高温x射线衍射、差示扫描量热法、拉伸试验和动态力学分析等手段对合金进行了表征。结果表明，在初始合金中添加0.04 wt%的稀土后，合金的晶粒尺寸明显减小，塑性得到改善，热力学性能得到提高。稀土的加入使合金的拉伸断裂应力和拉伸断裂应变分别从550 MPa和4.50%提高到660 MPa和5.0%。最大可采菌株由1.2%提高到1.8%。该合金的力学性能和形状记忆响应的显著改善主要归因于富re析出相形成的额外晶粒细化。
In this study a Cu–12wt%Al–3wt%Ni–0.6wt%Ti + RE high temperature shape memory alloy, where RE denotes the rare earth doping elements, was prepared by vacuum arc melting and characterized by means of scanning electron microscopy, field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction at room and elevated temperatures, differential scanning calorimetry, tensile test and dynamic mechanical analysis. The results demonstrated that the addition of a 0.04 wt% RE to the initial alloy caused a significant grain size reduction, improved the ductility and enhanced the thermo-mechanical properties. As a consequence of the addition of RE, both the tensile fracture stress and tensile fracture strain of the alloy increased from 550 MPa and 4.50% to 660 MPa and 5.0%, respectively. The maximum recoverable strain was raised from 1.2% to 1.8%. A significant improvement of the mechanical properties and shape memory response of this alloy was attributed to the extra grain refinement mainly due to the formation of the RE-rich precipitates.