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SUMMARY:Microstructure control in metal additive manufacturing: a LEGO ana
 logy - Dr Matteo Seita\, CUED
DTSTART:20221111T140000Z
DTEND:20221111T150000Z
UID:TALK182432@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:One of the defining features of fusion-based additive manufact
 uring (AM) processes is the localized melting of metal by a high-energy so
 urce\, which fuses the material together point by point into a 3-D part. B
 y varying the processing parameters at any point across the build\, it is 
 possible to control the solidification of the material and drive the forma
 tion of different microstructures. This unique capability offers the oppor
 tunity to build polycrystals with arbitrary microstructures from the botto
 m-up—as if they were made out of LEGO.\n\nIn this talk I will showcase t
 wo microstructure control strategies in AM\, which we developed to control
  the distribution of two fundamental features of polycrystalline metals: c
 rystal grains and grain boundaries. The first entails a grain selection pr
 ocess upon solidification\, which results in the formation of pseudo-singl
 e crystals with arbitrary geometry and controlled orientation. Using this 
 strategy\, we build pseudo-polycrystals with grain configurations that do 
 not exist in nature. The second focuses on engineering the thermal stabili
 ty of metal alloys to control the occurrence of recrystallisation site-spe
 cifically. Because recrystallisation produces substantial changes in the g
 rain boundary character distribution\, this strategy may be employed as a 
 grain boundary engineering approach for AM materials.\n\nThese two example
  strategies embody a new paradigm in AM\, which enables the design and pro
 duction of parts with novel functionalities and enhanced performance by co
 mbining multiple\, dissimilar microstructures within the same build.
LOCATION:Oatley Seminar Room\, Department of Engineering
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