Abstract
We demonstrate a strong dependence of twinning stress (TS) on twin boundary (TB) velocity in Ni50Mn28Ga22 5M martensite. Different types of TBs exhibit substantially different dynamic properties under magnetic field actuation. For type 1 interface, the dynamic TS drastically increases from its quasi-static value of ~0.6 to ~3.2MPa, limiting the TB velocity to 3–4m/s at saturation magnetic driving force. Type 2 TBs show a gradual increase of the TS from ~0.1MPa to ~2MPa, reaching velocities of ~35–39m/s. Our findings bring to the fore type 2 interfaces for applications demanding high actuation speeds and frequencies.
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