Powder Metallurgical Processes for NiTi Shape Memory Alloys

• Type: Article in International Conference Proceedings Book
• Date: 2010

Authors

Neves, F (Author) Other; Braz M B Fernandes (Author) Other; Martins, I (Author) Other; Correia, JB (Author) Other; Oliveira, M (Author) FEUP; Gaffet, E (Author) Other; Boucharat, N (Author) Other; Lattemann, M (Author) Other; Suffner, J (Author) Other; Hahn, H (Author) Other

Conference proceedings International

Title: ADVANCED MATERIALS FORUM V, PT 1 AND 2

Pages: 928-933

5th International Materials Symposium/14th Conference of the Sociedade-Portuguesa-de-Materiais

Lisbon, PORTUGAL, APR 05-08, 2009

Indexing

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Scientific classification

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-003-9XG

DOI: 10.4028/www.scientific.net/msf.636-637.928

Abstract (EN): Two promising powder metallurgy (PM) processes were used for the fabrication of NiTi shape memory alloys (SMA): Mechanically Activated Reactive FOrging Synthesis (MARFOS) and Mechanically Activated Reactive Extrusion Synthesis (MARES). In these two processes, equimolar powder mixtures of elemental Ni and Ti are first mechanically activated and then forged/extruded at relatively low temperature. Afterwards, heat treatments are used to promote homogenization and to adjust the composition of the NiTi matrix. When MARFOS and MARES processes are compared some differences have been observed but only in relation to the extent of phase transformation and to the degree of densification. The crystallite size was less than 100 nm for all the phases which indicates nanostructured materials and multi-step martensitic transformations could be observed in heat treated materials.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6