XRD analysis of highly mobile interface in twinned Ni-Mn-Ga martensite

0372637 - FZÚ 2012 DE eng C - Conference Paper (international conference)
Drahokoupil, Jan - Straka, L. - Heczko, Oleg
XRD analysis of highly mobile interface in twinned Ni-Mn-Ga martensite.
ICFSMA 2011. 3rd International Conference on Ferromagnetic Shape Memory Alloys. Dresden: IFW Dresden, 2011, s. 167-168. ISBN N.
[International Conference on Ferromagnetic Shape Memory Alloys /3./ - ICFSMA 2011. Dresden (DE), 18.07.2011-22.07.2011]
Grant - others:AVČR(CZ) M100100913
Institutional research plan: CEZ:AV0Z10100520
Keywords : ferromagnetic shape memory * structure of twin boundary * magnetic shape memory effect
Subject RIV: BM - Solid Matter Physics ; Magnetism

An interface between macroscopic twin variants in Ni-Mn-Ga single crystal was investigated using optical differential interference contrast and XRD. This single interface (twin boundary) is highly movable under the stress less than 0.2 MPa. The interface exhibits low angle zig-zag pattern with straight broad bands approximately perpendicular to the interface. Neither mosaic structure nor a-b twins can be correlated with the optical contrast associated with the bands. The modulation or monoclinic twins, detected using non-integer (4.4 0.4 0) planes, showed almost exact correspondence with the optical contrast. The investigation suggests that modulation or monoclinic twins play crucial role in extraordinary high mobility of the Ni-Mn-Ga alloys.
Permanent Link: http://hdl.handle.net/11104/0205902