Nicht schön, aber selten.
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\begin{document}
\begin{figure}[ht]
\caption*{Grathöhe $h_{0}$}
\begin{tikzpicture}
\begin{semilogxaxis}[width=7.9cm,height=7.9cm,ylabel shift = -0.3cm,
xlabel={ $a_{e}$ in mm},
ylabel={$h_{0}$ in $\mu$m},
xmin=0, xmax=1.0,
ymin=0, ymax=1000,
xtick={0,0.02,0.05,0.1,0.2,0.5,1.0},
ytick={0,250,500,750,1000},
log ticks with fixed point,
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%xmajorgrids=false,
%grid style=dashed,
/pgf/number format/.cd,
use comma,
1000 sep={},
legend columns=-1,
legend entries={Konventionelle Scheibe, Hochharte Scheibe},
entries={Sonstiges, Nichts},
legend style={at={(0.5,-0.1)},anchor=north},
legend to name=named
]
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\end{semilogxaxis}
\end{tikzpicture}
\begin{tikzpicture}
\begin{semilogxaxis}[width=7.9cm,height=7.9cm,ylabel shift = -0.3cm,
xlabel={ $a_{e}$ in mm},
ylabel={ $h_{0}$ in $\mu$m},
xmin=0, xmax=1.0,
ymin=0, ymax=1000,
xtick={0,0.02,0.05,0.1,0.2,0.5,1.0},
ytick={0,250,500,750,1000},
log ticks with fixed point,
%legend style={at={(0.5,-0.1)},anchor=north},
%ymajorgrids=false,
% xmajorgrids=false,
% grid style=dashed,
/pgf/number format/.cd,
use comma,
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\end{semilogxaxis}
\end{tikzpicture}
\begin{center}
\ref{named}
\label{dia1}
\caption{Bildunterschrift}
\end{center}
\end{figure}
\end{document}
[![alt text][1]][1]
[1]: https://texwelt.de/wissen/upfiles/2018-04-13_20_04_12-Master_Thesis_-_Online_LaTeX_Editor_ShareLaTeX_2.png
