周惠久论坛——Deformation and Failure of Advanced Structural Materials

Damage tolerant materials with good combinations of strength and toughness

are critical for increasingly complex structural applications and remain

a long-standing goal in materials science and engineering. Unfortunately,

these properties are often mutually exclusive, and the development of

damage-tolerant alloys has traditionally required a compromise between

hardness and ductility. In the first part of this talk, we evaluate the

correlation between fracture toughness and ductility in Al-, Fe-, and

Ti-based AM alloys and highlight how their unique structural features

can lead to pronounced variability in fracture toughness for materials

with otherwise similar ductility. Using examples such as LPBF-fabricated

AlSi10Mg and 18Ni-300 maraging steel, we demonstrate how printing parameters

and post-processing influence deformation behavior and mechanical performance,

and how mixed powders can create mesostructures that enable excellent

damage tolerance in duplex stainless steel without post-processing heat

treatment. We will discuss how structural modifications introduced through

high-pressure torsion and precise heat treatments affect strength, tensile

plasticity, and failure behavior in BMGs. Finally, we will examine how

AM may provide new pathways to overcome some of the processing limitations

associated with BMGs, thereby paving the way for their broader use in

engineering applications.

Bernd Gludovatz is a Professor in the School of Mechanical and Manufacturing

Engineering at UNSW Sydney. He received his M.S. and his Ph.D. as a student

of Prof. Reinhard Pippan at the University of Leoben, Austria, both in

Materials Science and Engineering. After that, he worked as a post-doctoral

fellow of Prof. Robert O. Ritchie at the Materials Sciences Division of

the Lawrence Berkeley National Laboratory in the US.