Formability of Annealed Ni-Ti Shape Memory Alloy Sheet

2017 5th International Conference on Mechanical Engineering, Materials Science and Civil Engineering

机械制造;材料科学;土木建筑工程

Fann, K.J.^1 ; Su, J.Y.^1 ; Chang, C.H.^1

Department of Mechanical Engineering, National Chung Hsing University, Taichung

40227, Taiwan^1

关键词: Annealing temperatures;    Austenitic phase;    Cold formability;    ITS applications;    NiTi shape memory alloys;    Specific properties;    Superelasticity;    Ti sheets;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/324/1/012038/pdf
DOI  :  10.1088/1757-899X/324/1/012038

来源: IOP

【 摘 要 】

Ni-Ti shape memory alloy has two specific properties, superelasiticity and shape memory effect, and thus is widely applied in diverse industries. To extend its application, this study attempts to investigate the strength and cold formability of its sheet blank, which is annealed at various temperatures, by hardness test and by Erichsen-like cupping test. As a result, the higher the annealing temperature, the lower the hardness, the lower the maximum punch load as the sheet blank fractured, and the lower the Erichsen-like index or the lower the formability. In general, the Ni-Ti sheet after annealing has an Erichsen-like index between 8 mm and 9 mm. This study has also confirmed via DSC that the Ni-Ti shape memory alloy possesses the austenitic phase and shows the superelasticity at room temperature.