Highly mobile type II twin boundary in Ni-Mn-Ga five-layered martensite

Journal Article · Mon Sep 19 00:00:00 EDT 2011 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3640489· OSTI ID:22027748

Sozinov, A; Lanska, N; Soroka, A ^[1]; Straka, L ^[2]

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1. AdaptaMat Ltd., Yrityspiha 5, Helsinki FIN-00390 (Finland)
2. School of Science and Technology, Laboratory of Engineering Materials, Aalto University, PL 14200, FIN-00076 AALTO (Finland)

Twin relationships and stress-induced reorientation were studied in Ni{sub 2}Mn{sub 1.14}Ga{sub 0.86} single crystal with five-layered modulated martensite crystal structure. Very low twinning stress of about 0.1 MPa was found for twin boundaries which deviated a few degrees from the (011) crystallographic plane. However, twin boundaries oriented exactly parallel to the (011) plane exhibited considerably higher level of twinning stress, above 1 MPa. X-ray diffraction experiments and calculations based on approximation of the martensite crystal lattice as a tetragonal lattice with a slight monoclinic distortion identified the two different kinds of twin interfaces as type II and type I twin boundaries.

• OSTI ID: 22027748
• Journal Information: Applied Physics Letters, Vol. 99, Issue 12; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
APPROXIMATIONS
GALLIUM ALLOYS
INTERFACES
MANGANESE ALLOYS
MARTENSITE
MARTENSITIC STEELS
MONOCLINIC LATTICES
MONOCRYSTALS
NICKEL ALLOYS
PRESSURE RANGE MEGA PA
STRESSES
TETRAGONAL LATTICES
TWINNING
X-RAY DIFFRACTION