Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microstructure of precipitates and magnetic domain structure in an
  annealed Co38Ni33Al29 shape memory alloy   The microstructure of a CoNiAl FSMA was determined by conventional
transmission electron microscopy, electron diffraction studies together with
advanced microscopy techniques and in-situ Lorentz microscopy. 10 to 60 nm
sized rod-like precipitates of hcp $\epsilon$-Co were confirmed to be present
by HRTEM. The orientation relationship between the precipitates and B2 matrix
is described by the Burgers orientation relationship. The crystal structure of
the martensite obtained after cooling is tetragonal L10 with a (1-11) twinning
plane. The magnetic domain structure was determined during an in-situ cooling
experiment using the Fresnel mode of Lorentz microscopy. While transformation
proceeds from B2 austenite to L10 martensite, new domains are nucleated leading
to a decrease in domain width, with the magnetization lying predominantly along
a single direction. It was possible to completely describe the relationship
between magnetic domains and crystallographic directions in the austenite phase
though complications existed for the martensite phase.

1
The categories of this paper are: cs
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an