A Possibility Study of Fabricating TiNi SMA Foils with the Vacuum Hot-Pressing Process

• Main Authors: Ho, Yu Ting, 何羽婷
• Other Authors: Hu, Chen-Ti
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/29001464107882805393

碩士 === 國立清華大學 === 材料科學工程學系 === 104 === The aim of present study is developing a new and simple process to fabricate the TiNi shape memory alloy thin plate by hot pressing the sandwich-stacked Ni/Ti/Ni thin foils under a good vacuum condition. The effects of following various hot pressing conditions are examined and discussed in this report : 1. Change stacking sequence of Ni and Ti foils; 2. Employing cold rolled Ni foils; 3. Change external loading forces in hot pressing; 4. Varied length of time in hot pressing process under a fixed temperature; 5. Very large size specimens. The OM(Optical Microscope), SEM(Scanning Electron Microscope), EDS(Energy Dispersive Spectrometer), DSC(Differential Scanning Calorimetry), and the shape recovery behavior studies were conducted on various hot pressed Ni/Ti/Ni stacked specimens to investigate the microstructural changes, phase constituents, physic properties and shape memory property. Results of present study indicate the good shape memory behaviors could be observed from the specimens fabricated by hot pressed Ni/Ti/Ni stacked foils.