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Microstructure control in metal additive manufacturing

Department of Materials

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Dr W Mirihanage Applications accepted all year round

About the Project

Metal additive manufacturing (AM) is rapidly emerged as a viable alternative to subtractive manufacturing. Among various AM techniques. AM processes use commercially available wires which are produced for the welding industry. Microstructures of metallic components are a key contributory factor for resilience and relabel use with intended mechanical properties. The solidified microstructures of AM components are however severely affected by the local temperature field near the growth interface that promote strong grain orientation, instead equiaxed microstructures are mostly for wide range of engineering applications.

This PhD project aims to study possible microstructure control mechanisms that can be applied to AM processes, in order to step towards the future inline process control capabilities. Potential for intensified dendrite fragmentation and other nucleation mechanisms, which can act as control measures to reduce coarse grain structures and textures are aimed to examine. In particularly, the ways that can control the melt pool flow as tool to increased nucleation/fragmentation potential with ways to reduce effective thermal gradients at the melt pools will be focused. Experimental data from multiscale ex situ post metallographic examinations and in situ synchrotron experiments will be used for model guiding and validation. In addition, a supportive computational framework is expected to develop to interpret and integrate multiple experimental data into comprehensive scientific and engineering information.

Funding Notes

Applicants should have or expect to achieve at least a 2.1 honours degree or Masters in Materials Science/Engineering, Physics, Mathematics, Mechanical Engineering or closely related subject.

Self funded students are also welcome to apply.

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