The influence of dopants and complexion transitions on grain boundary fracture in alumina
Source abstract
Abstract
Abstract The fracture of micro-cantilever Al 2 O 3 specimens containing single grain boundaries is quantified via in situ bending experiments performed in the transmission electron microscope. The type of grain boundary complexion plays a dominant role in determining the fracture response, while the dopant chemistry has a secondary effect for the same complexion type. More ‘ordered’ complexions, those containing sub-monolayer adsorbates, are tougher than the undoped material. The behaviors of SiO 2 and Y 2 O 3 doped Al 2 O 3 with different complexions are compared and contrasted. In general, grain boundaries exhibiting more ‘disordered’ complexions types, those with multilayer adsorbates, are embrittled relative to undoped Al 2 O 3 .
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Research context
OpenAlex topics: Microstructure and mechanical properties · Advanced ceramic materials synthesis · Aluminum Alloys Composites Properties
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