Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 26, Issue 3, Pages 253-261Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/026708309X12601952777747
Keywords
Grain boundary engineering; Grain boundary structure; Grain boundary plane; Intergranular corrosion; Intergranular cracking; Twinning; Review
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In 1984, 'grain boundary design', later known as 'grain boundary engineering ( GBE)', was proposed. The central premise of GBE is that specific thermomechanical treatments, mainly on face centred cubic materials which readily form annealing twins, can be used to improve resistance to various forms of intergranular degradation such as corrosion, cracking or embrittlement. Engagement with the concept has accelerated in recent years. This overview charts the progress of GBE from its inception 25 years ago to the present day, including suggestions of key topics for ongoing or future research. These topics comprise confirmation of which boundaries are 'special' in terms of crystallography and properties, optimisation of processing regimes, new approaches to GBE in systems without annealing twinning and incorporation of connectivity metrics, especially in three dimensions.
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