Formability of Annealed Ni-Ti Shape Memory Alloy Sheet

[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.

[发布机构] Department of Mechanical Engineering, National Chung Hsing University, Taichung; 40227, Taiwan^1

[效力级别] 材料科学

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