Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structural-disorder and its effect on the mechanical properties in
  single-phase TaNbHfZr high-entropy alloys   Equiatomic TaNbHfZr refractory high-entropy alloys (HEAs) were synthesized by
arc-melting. The HEAs were annealed at 1800{\deg}C for different times, at
maximum up to 8 days. Their on average body-centered cubic (bcc),
solid-solution structure was confirmed by X-ray (XRD) and neutron (ND)
diffraction, respectively. The HEAs are characterized by high average values of
the static atomic displacements from the ideal lattice positions and the local
internal strain. The short-range clustering (SRC) of a subset of atoms,
enriched in Hf and Zr takes place perpendicular to the <1 0 0> directions.
Furthermore, it becomes increasingly interconnected as a function of the
annealing time. This is revealed by the evaluation of diffuse XRD intensities,
high-resolution transmission electron microscopy (HRTEM) images, and atom probe
tomography (APT). The local structural disorder and distortions at the SRC were
modeled by molecular dynamics (MD) relaxations. The hardness and compressive
yield strength of the as-cast HEA is found to be many times of what can be
expected from the rule of mixture. The yield strength further increases by 76 %
after 1 day of annealing, which can be explained by a strengthening mechanism
resulting from the SRC. With further annealing to 4 days, a minor phase with
hexagonal close packed (hcp) structure and rich in Hf and Zr nucleates at the
larger connecting nodes of the SRCs.

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The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat