Mechanical hysteresis (MEH): The magnetically induced reorientation (MIR) and MIR-related functionality is mediated by the motion of martensite twin boundaries, which is inevitably accompanied by mechanical hysteresis. A so-called twinning stress is a direct quantitative measure of MEH. The functionality can occur only when mechanical hysteresis (twinning stress) is very small. The fellow and his collaborators were the first to show that so-called Type 2 twin boundaries in Ni-Mn-Ga MSMAs can exhibit extremely low MEH (twinning stress of ~0.1 MPa) , about one order smaller than was previously reported. Moreover, they showed as first that such low MEH can be almost temperature independent for specially designed alloy compositions , while previously reported alloys typically showed strong temperature dependence. These scientific findings have strongly expanded the potential practical applicability of MSMAs.
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