Grain boundary engineering involves the deliberate control of both the types and density of grain boundaries in a polycrystalline aggregate in an effort to improve the overall mechanical, physical and chemical properties of materials. This paper addresses recent advances in the development of grain boundary engineered polycrystalline and nanocrystalline materials with improved resistance to intergranular and localized degradation (e.g. intergranular corrosion, intergranular stress corrosion cracking) and enhanced mechanical properties (e.g. hardness, yield strength, tensile strength). Examples of emerging industrial applications for grain boundary engineered materials are presented.
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