Journal
MATERIALS RESEARCH BULLETIN
Volume 58, Issue -, Pages 234-238Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2014.04.049
Keywords
Alloys; Intermetallic compounds; Intercalation reactions; Mechanical properties; Electron microscopy; Fracture
Categories
Funding
- Fundamental R&D Program for Core Technology of Materials - Ministry of Knowledge Economy (MKE), Republic of Korea [10041185]
- Industrial Strategic Technology Development Program - Ministry of Knowledge Economy (MKE), Republic of Korea [10042703]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10041185, 10042703] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A hot forging process of an as-cast NiTi shape memory alloy was designed by processing maps and a finite element method analysis. The NiTi alloy samples used in this study were made using a vacuum plasma arc melting process. In order to analyze the microstructural change and flow behavior of the as-cast NiTi alloy during the ingot breakdown process, high temperature compression tests were carried out at different temperatures and strain rates up to a true strain level of 0.9. Deformation processing maps were generated by using the dynamic materials model approach developed by Prasad to search for the optimum hot forging process conditions. The flow instability criterion proposed by Ziegler was utilized to evaluate the unstable deformation region in the processing map. The grain refinement was achieved by recrystallization during high temperature deformation of the NiTi alloy. Finally, the optimum hot forging design to obtain a sound NiTi billet without forging defects was identified with the actual ingot breakdown process. (C) 2014 Elsevier Ltd. All rights reserved.
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