%0 journal article
%@ 2199-384X
%A Oliveira, J.P.,Braz Fernandes, F.M.,Miranda, R.M.,Schell, N.

%D 2016
%J Shape Memory and Superelasticity
%N 1
%P 114-120 
%R doi:10.1007/s40830-016-0058-z
%T On the mechanisms for martensite formation in YAG laser welded austenitic NiTi
%U https://doi.org/10.1007/s40830-016-0058-z
1 
%X Extensive work has been reported on the microstructure of laser-welded NiTi alloys either superelastic or with shape memory effect, motivated by the fact that the microstructure affects the functional properties. However, some effects of laser beam/material interaction with these alloys have not yet been discussed. This paper aims to discuss the mechanisms for the occurrence of martensite in the heat-affected zone and in the fusion zone at room temperature, while the base material is fully austenitic. For this purpose, synchrotron radiation was used together with a simple thermal analytic mathematical model. Two distinct mechanisms are proposed for the presence of martensite in different zones of a weld, which affects the mechanical and functional behavior of a welded component.