A1 Journal article (refereed), original research

Dynamic twinning stress and viscous-like damping of twin boundary motion in magnetic shape memory alloy Ni-Mn-Ga

LUT Authors / Editors

Publication Details
Authors: Saren Andrey, Ullakko Kari
Publisher: Elsevier
Publication year: 2017
Language: English
Related Journal or Series Information: Scripta Materialia
Volume number: 139
Start page: 126
End page: 129
Number of pages: 4
ISSN: 1359-6462
eISSN: 1872-8456
JUFO-Level of this publication: 3
Open Access: Not an Open Access publication


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 ~3.2 MPa, limiting the TB velocity to 3–4 m/s at saturation magnetic driving force. Type 2 TBs show a gradual increase of the TS from ~0.1MPa to ~2MPa, reaching velocities of ~35–39 m/s. Our findings bring to the fore type 2 interfaces for applications demanding high actuation speeds and frequencies.

Last updated on 2018-19-10 at 07:55