Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lattice swelling and modulus change in a helium-implanted tungsten
  alloy: X-ray micro-diffraction, surface acoustic wave measurements, and
  multiscale modelling   Using X-ray micro-diffraction and surface acoustic wave spectroscopy, we
measure lattice swelling and elastic modulus changes in a W-1%Re alloy after
implantation with 3110 appm of helium. A fraction of a percent observed lattice
expansion gives rise to an order of magnitude larger reduction in the surface
acoustic wave velocity. A multiscale elasticity, molecular dynamics, and
density functional theory model is applied to the interpretation of
observations. The measured lattice swelling is consistent with the relaxation
volume of self-interstitial and helium-filled vacancy defects that dominate the
helium-implanted material microstructure. Molecular dynamics simulations
confirm the elasticity model for swelling. Elastic properties of the implanted
surface layer also change due to defects. The reduction of surface acoustic
wave velocity predicted by density functional theory calculations agrees
remarkably well with experimental observations.

11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th