Shape memory alloys (SMAs) are a unique class of materials with the
ability to recover their shape when the temperature is increased.
An increase in temperature can result in shape recovery even under
high applied loads. SMAs can also absorb and dissipate mechanical
energy by undergoing a reversible hysteretic shape change when
subjected to applied mechanical cyclic loading. These
characteristics have made SMAs very popular for applications such
as sensing and actuation, absorption and vibration damping. The
application of SMAs spans a wide variety of industrial sectors such
as aerospace automotive, biomedical and oil exploration. The demand
of joining techniques for SMAs has become of great importance, as
their functional properties, namely shape memory effect and
superelasticity, present unique solutions for state-of-the-art
applications. An investigation was conducted on laser welding of
NiTi alloys aiming at correlating the mechanical cycling behavior
and the microstructure obtained.
General
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