TY - GEN
T1 - In situ structural characterization of laser welded NiTi shape memory alloys
AU - Fernandes, Francisco Manuel Braz
AU - Mahesh, Karimbi Koosappa
AU - Craciunescu, Corneliu Marius
AU - Oliveira, João Pedro
AU - Schell, Norbert
AU - Miranda, Rosa Maria
AU - Quintino, Luisa
AU - Ocaña, José Luis
N1 - The authors would like to acknowledge the funding of FCT/MCTES for the project `MICROBOND - Joining micro to small scale systems in shape memory alloys using last generation infrared lasers' (PTDC/EME-TME/100990/2008), the project Smart Composites (PTDC/CTM/66380/2006) and the financial support of CENIIVIAT/13N through the Strategic Project Pest C/CTM/LA0025/2011. JPO acknowledges the BI fellowship REF PTDC/EME-TME/100990/2008 allocated by 1DMEC in the framework of the MICROBOND project.
PY - 2013/2/25
Y1 - 2013/2/25
N2 - Preserving the shape memory effect (SME) and superelasticity (SE) in shape memory alloys (SMAs) after a joining process is of great importance. In this work Ni-rich NiTi SMAs were laser welded using a Nd:YAG laser in continuous mode. A detailed structural characterization was carried by means of X-ray diffraction (XRD). It was possible to observe the existence of a microstructural gradient from the base material (BM), which contained only austenite, through the heat affected zone (HAZ) and the fusion zone (FZ), where both zones contained austenite and martensite. The mechanical behavior under cyclic load/unload of the welded samples may be explained taking in consideration the structural information retrieved from the XRD analysis.
AB - Preserving the shape memory effect (SME) and superelasticity (SE) in shape memory alloys (SMAs) after a joining process is of great importance. In this work Ni-rich NiTi SMAs were laser welded using a Nd:YAG laser in continuous mode. A detailed structural characterization was carried by means of X-ray diffraction (XRD). It was possible to observe the existence of a microstructural gradient from the base material (BM), which contained only austenite, through the heat affected zone (HAZ) and the fusion zone (FZ), where both zones contained austenite and martensite. The mechanical behavior under cyclic load/unload of the welded samples may be explained taking in consideration the structural information retrieved from the XRD analysis.
KW - Laser welding
KW - Shape memory alloys
KW - X-ray diffraction
UR - http://www.scopus.com/inward/record.url?scp=84874103471&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.738-739.338
DO - 10.4028/www.scientific.net/MSF.738-739.338
M3 - Conference contribution
AN - SCOPUS:84874103471
SN - 9783037856109
T3 - Materials Science Forum
SP - 338
EP - 343
BT - European Symposium on Martensitic Transformations, ESOMAT 2012
A2 - Prokoshkin, Sergey
A2 - Resnina, Natalia
PB - Trans Tech Publications
T2 - 9th European Symposium on Martensitic Transformations, ESOMAT 2012
Y2 - 9 September 2012 through 16 September 2012
ER -