BIANNUAL REPORT 2018/19

Basic Research
Research Theme 8:
METASTABLE
SOLIDIFICATION OF NOVEL
PERITECTIC STRUCTURES
A. Ludwig, J.P. Mogeritsch
Aims and key objectives
• To understand the formation of isothermal
peritectic coupled growth (IPCG) and the
impact convection might have on the
occurrence of this metastable growth mode;
• To define a suitable process window
for the occurrence of IPCG;
• To perform solidification experiments with the
transparent peritectic model alloy TRIS-NPG
under microgravity conditions on board of the International
Space Station (ISS), and compare the
observation with its equivalent terrestrial experiments;
• To investigate the transition from
lateral bands to IPCG and to identify
transient and steady growth modes;
• To perform phase field simulation of IPCG
and suggest a theoretic framework for the
physical processes that favour this
metastable growth form;
a
b
Figure 8:
(a) In-situ studies on the transition from island bands to a kind of 1-λ instability to Isothermal Peritectic Coupled Growth in
the transparent model system TRIS-NPG; (b) the experiment of solidification of couples peritectic growth is designed to be
performed on the International Space Station ISS
20 Research Theme 8: Metastable Solidification of Novel Peritectic Structures