Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microstructural evolution during ageing of Al-Cu-Li-x alloys   In this study atom probe tomography was used to investigate the
microstructure of AA2198 (Al-1.35Cu-3.55Li-0.29Mg-0.08Ag) over a range of
ageing conditions to examine the evolution of phases in the alloy, in
particular aiming to reveal the nucleation mechanism of the strengthening T1
phase, which has been under debate for decades. T1 precursor phases were
observed from early ageing, a significant number of which were connected to
solute-enriched dislocations. Ag and Mg segregation to T1 interfaces was
convincingly observed when the plates were oriented perpendicular to the
probing direction, which is the condition under which the spatial resolution of
the atom probe data is highest.

35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom