An Overview on Recent Works of Heterostructured Materials Fabricated by Surface Mechanical Attrition Treatment

Abstract

Surface mechanical attrition treatment (SMAT) method has been widely acknowledged to obtain desired combination of strength and ductility in metals and alloys, and helpfully overcome the "trade-off" between the two mechanical properties. Within researches for more than 20-years, the favorable mechanical properties are related to the typical gradient structure (GS) in metals and alloys prepared by SMAT. In this overview, the principle and process parameters of SMAT are concisely presented. The strengthening mechanisms are interpreted by traditional dislocation-twin theory, hetero-deformation induced (HDI) theory and theory of shear band and strain delocalization. Besides, the strengthening mechanisms and methods to obtain excellent mechanical properties are discussed. Furthermore, both the latest progresses in design of GS materials prepared by SMAT and some other research interests are displayed.

Severe Plastic Deformation of Light Metals (Magnesium, Aluminum and Titanium) and Alloys by High-Pressure Torsion: Review of Fundamentals and Mechanical/Functional Properties

“…15,16) For the most recent progress in the field of SPD, the readers are referred to a 2023 special issue of Materials Transactions, 17) which covered various aspects like processing methods, [18][19][20][21][22][23][24][25][26] structural/microstructural features, [27][28][29][30][31][32][33] mechanical/functional properties, nanostructured metallic and non-metallic materials [56][57][58][59][60][61][62][63][64][65][66][67][68] and heterostructured materials. [69][70][71][72] Among various SPD methods, ECAP and ARB have the potential for commercialization. 3) However, HPT is the most promising method for fundamental studies because it applies to almost any kind of materials including hard-to-deform refractory metals, 73,74) ultrahard high-entropy alloys, 75,76) glasses, 77,78) brittle ceramics and oxides 79,80) and even diamond.…”