Effects of Quenching Media on Phase Transformation Characteristics and Hardness of Cu-Al-Ni-Co Shape Memory Alloys

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• 作者：Safaa N. Saud (1)
  E. Hamzah (1)
  T. Abubakar (1)
  S. Farahany (1)
  H. R. Bakhsheshi-Rad (1)
  
  1. Faculty of Mechanical Engineering ; Universiti Teknologi Malaysia ; 81310 ; Johor Bahru ; Johor ; Malaysia
  
• 关键词：Cu ; Al ; Ni ; Co ; quenching media ; shape memory alloys ; thermal treatment ; transformation temperature
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：24
• 期：4
• 页码：1522-1530
• 全文大小：2,221 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Materials Science
  Tribology, Corrosion and Coatings
  Quality Control, Reliability, Safety and Risk
  Engineering Design
  
• 出版者：Springer New York
• ISSN：1544-1024

文摘

This paper presents the investigation on the effects of various thermal treatments and quenching media on the phase transformation behaviour of Cu-Al-Ni-Co shape memory alloys (SMAs). The transformation temperatures were determined using a differential scanning calorimeter. The variation of cooling rates had a consequential effect on the phase transformation characteristics of the Cu-Al-Ni-Co SMAs. Nevertheless, the transformation temperature peaks were varied in terms of location as well as heat flow. The results indicated that there was an improvement in transformation temperatures whenever ice water was used as quenching medium. It was also observed that the forward transformation temperatures were higher than the reverse transformation. It was verified that the required heat for the transformation of martensite into austenite was more than the transformation of austenite into martensite. Moreover, thermodynamic parameters, such as enthalpy and entropy, tended to decrease and increase as a result of the changes in the cooling rates of each medium. To clarify the variations of the structures and properties of Cu-Al-Ni-Co SMA quenched samples, x-ray diffraction, atomic force microscopy, field emission scanning electron microscopy, energy dispersive spectroscopy, and Vickers hardness were used.