Affiliations: [a] Institute of Materials Science, University of Silesia,
Bankowa 12, 40-007 Katowice, Poland
Correspondence:
[*]
Corresponding author: Tomasz Goryczka, Institute of Materials
Science, University of Silesia, Bankowa 12, 40-007 Katowice, Poland. Tel.: +48
32 3591796; Fax.: +48 32 2596929; E-mail: [email protected]
Abstract: Polycrystalline 51.2at%N 27.6at%Mn and 21,1at% Ga bulk samples
were quenched after annealing at 700°C,
800°C and 900°C for one
hour. The parent phase, in sample quenched from
900°C, reveals the B2 structure whereas in the sample
quenched from 700°C – the Heusler's structure
L2_{1}. The ordering transformation was confirmed by the
results obtained from high temperature DSC measurement. On a heating curve
broad thermal peak appeared in the range between
700°C and 800°C. Increasing
of the quenching temperature results in lowering temperatures of the
martensitic transformation and simultaneously broadens its thermal range.
Independently on the quenching temperature and the ordering of the parent phase
the martensite shows the 10M structure type. However, in electron diffraction
pattern, taken for the sample quenched from 800°C,
additional effects of the diffusion electron scattering have been observed as a
result of a short-range ordering caused by the Ni exceeding atoms.
