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Structure design of high-performance cu-based shape memory alloys

Rare Metals 2015年第9期34卷 607-624页

作者： Jian-Xin Xie Ji-Li Liu Hai-You Huang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing Laboratory of Metallic Materials and Processing for Modern Transportation

The effects of various structure factors on the properties(superelasticity mainly) of cu-based shape memory alloys(SMAs) were systematically evaluated in this review article through literatures combining with our work. It is concluded that besides the decisive role of grain orientation, the grain boundary(GB) characteristics also play important roles in the superelasticity, which include GB area, GB type, GB morphology and GB direction in descending order of the effect significance. According to the above results, the prior principles of structure design are proposed for high-performance cu-based SMAs from most to least important:(1) obtaining grain orientation with high phase transformation strain;(2) increasing grain size or reducing GB area;(3) obtaining straight low-energy GBs, especially low-angle GBs;(4) trying to make GB direction parallel to external stress. Consistent with the main or all principles, the bamboo-like-grained and columnar-grained(CG) cu-based SMAs show excellent comprehensive properties.

关键词： cu-based shape memory alloy Superelasticity cu–Al–

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Corrosion behavior of cu-Al-Mn-Zn-Zr shape memory alloy in NaCl solution

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Transactions of Nonferrous Metals Society of China 2021年第4期31卷 1012-1022页

作者： Mo-yang YIN Zhou LI Zhu XIAO Yong PANG Ya-ping LI Zi-yan SHEN School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Key Laboratory of Non-ferrous Metal Materials Science and Engineering Ministry of EducationCentral South UniversityChangsha 410083China

The corrosion behavior of a copper-based shape memory alloy(cu-Al-Mn-Zn-Zr) in 3.5 wt.% Na Cl solution was investigated by means of potentiodynamic polarization measurements, electrochemical impedance spectroscopy(EIS) and X-ray photoelectron spectroscopy(XPS). At the beginning of corrosion, oxidation products formed on the surface of the shape memory alloy and constantly covered the reaction surface, resulting in the decrease of corrosion rate. After 4 d of immersion in NaCl solution, the corrosion product layer became thick and porous, leading to the increase of corrosion rate, and the corrosion reaction mechanism changed from polarization control to diffusion control. The diffusion impedance increased with increasing thickness of the oxide layer for the samples immersed in NaCl solution for 6-15 d. During the whole corrosion process, the reaction mechanism of the alloy changed and the corrosion resistance was improved continuously. The corrosion products mainly contained cuO, ZnO, Al2O3, MnO/Mn2O3, MnO2 and Al(OH)3. Transition of the corrosion products from cu2O to cuO and Al2O3 to Al(OH)3 occurred during corrosion.

关键词： cu-based shape memory alloy corrosion behavior polarization diffusion impedance

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