A technical and economic appraisal of shape memory alloys for aerospace applications

Welding and Joining of NiTi Shape Memory Alloys: A Review

“…In [122] the optimum temperature ranged between 900 and 950°C, with a welding time between 30 and 60 min, using a contact pressure of 5 MPa. For these parameters range, the tensile strength of the joints reached a maximum of 170 MPa, which was higher than the 107 MPa reported for laser welding of the same dissimilar combination [21].…”

“…In order to fulfil specific needs of the medical industry, welding experiments on dissimilar joints like NiTi/stainless steel [19] or Hastealloys [20] were performed and reported. In the aerospace industry new parts like gas turbine nozzles are being tested where NiTi is welded to Ti6Al4V [21], substituting the previously used mechanical joining by fasteners.…”

Effects of Welding Parameters on the Mechanical Performance of Laser Welded Nitinol

“…10) A technical appraisal of shape memory alloys conducted by Chau et al reiterated that much more research still needs to be undertaken before practical applications can commence. 11) It is well known that welding parameters can greatly influence the mechanical properties of laser welded materials.…”

Influence of Dynamic Compression on Phase Transformation of Martensitic NiTi Shape Memory Alloys

“…NITI shape memory alloys (SMAs) have been extensively applied in civil, [1][2][3] medical, [4][5][6][7][8] and aerospace [9][10][11] devices for their unique shape memory effect, pseudoelasticity, bio-compatibility, and corrosion resistance. [12][13][14][15][16][17][18] The characteristic transformation temperatures for the austenite-to-martensite phase transformation as well as the mechanical response can be modified to meet application requirements through (i) thermo-mechanical processing, [19][20][21] (ii) slight variation from the equi-atomic NiTi chemical composition, [22,23] or (iii) addition of alloying elements.…”