Direct evidence of detwinning in polycrystalline Ni-Mn-Ga ferromagnetic shape memory alloys during deformation
2008 (English)In: JOURNAL OF APPLIED PHYSICS, ISSN 0021-8979 , Vol. 104, no 10, 103519- p.Article in journal (Refereed) Published
In situ time-of-flight neutron diffraction and high-energy x-ray diffraction techniques were used to reveal the preferred reselection of martensite variants through a detwinning process in polycrystalline Ni-Mn-Ga ferromagnetic shape memory alloys under uniaxial compressive stress. The variant reorientation via detwinning during loading can be explained by considering the influence of external stress on the grain/variant orientation-dependent distortion energy. These direct observations of detwinning provide a good understanding of the deformation mechanisms in shape memory alloys.
Place, publisher, year, edition, pages
2008. Vol. 104, no 10, 103519- p.
ferromagnetic materials, gallium alloys, manganese alloys, martensitic structure, neutron diffraction, nickel alloys, shape memory effects, X-ray diffraction
IdentifiersURN: urn:nbn:se:liu:diva-16617DOI: 10.1063/1.3020534OAI: oai:DiVA.org:liu-16617DiVA: diva2:159523
Original Publication:Z H Nie, Ru Peng, Sten Johansson, E C Oliver, Y Ren, Y D Wang, Y D Liu, J N Deng, L Zuo and D E Brown, Direct evidence of detwinning in polycrystalline Ni-Mn-Ga ferromagnetic shape memory alloys during deformation, 2008, JOURNAL OF APPLIED PHYSICS, (104), 10, 103519.http://dx.doi.org/10.1063/1.3020534Copyright: American Institute of Physicshttp://www.aip.org/2009-03-032009-02-062009-03-03Bibliographically approved