|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Frontiers in Solidification: An MPMD Symposium in Honor of Michel Rappaz
||QQ-10: Anomalous Growth Behaviour in the Undercooled Al-Ni Alloy System
||Christian Karrasch, Matthias Kolbe, Stefan Klein, Georg Ehlen, Reeti Singh, Dieter M. Herlach
|On-Site Speaker (Planned)
The Al-Ni system is an industrial relevant material for aerospace and automotive applications which shows anomalous growth behaviour. The containerless method of electromagnetic levitation combined with a high-speed camera is applied to undercool Al-Ni alloys and measure the dendrite growth velocities. Ni-rich alloys show an increase in growth velocity with rising undercooling. However, the Al-rich alloys show unusual growth behaviour as their growth velocity decreases with increasing undercooling. In the present contribution we present investigations on the origin of this anomalous behaviour. Among them also the concept of inverse melting is discussed which has been introduced to explain amorphisation of crystalline alloys 30 years ago. This work is supported by the German Research Foundation DFG within contract HE1601/26-2 and by the European Space Agency ESA under contracts 15236/02//NL/SH.