Net-Shape NiTi Shape Memory Alloy by Spark Plasma Sintering Method

• Main Authors: Sneha Samal, Orsolya Molnárová, Filip Průša, Jaromír Kopeček, Luděk Heller, Petr Šittner, Marcela Škodová, Lorenzo Abate, Ignazio Blanco
• Format: Article
• Language: English
• Published: MDPI AG 2021-02-01
• Series: Applied Sciences
• Subjects: NiTi alloy; shape memory effect; spark plasma sintering; austenite phase
• Online Access: https://www.mdpi.com/2076-3417/11/4/1802
• ISSN: 2076-3417

An analysis of the shape memory effect of a NiTi alloy by using the spark plasma sintering approach has been carried out. Spark plasma sintering of Ti₅₀Ni₅₀ powder (20–63 µm) at a temperature of 900 °C produced specimens showing good shape memory effects. However, the sample showed 2.5% porosity due to a load of 48 MPa. Furthermore, an apparent shape memory effect was recorded and the specimens were characterized by uniformity in chemical composition and shape memory alloys of NiTi showed significant austenite phases with a bending strain recovery of >2.5%.