Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena
By X. Sauvage, Gerhard Wilde, S. Divinski, Z. Horita, R. Valiev. 2012
509 citations recorded by the source corpus.
Grain boundaries in ultrafine grained (UFG) materials processed by severe plastic deformation (SPD) are often called “non-equilibrium” grain boundaries. Such boundaries are characterized by excess grain boundary energy, presence of long range elastic stresses and enhanced free volumes. These features and related phenomena (diffusion, segregation, etc.) have been the object of intense studies and the obtained results provide convincing evidence of the importance of a non-equilibrium state of high angle grain boundaries for UFG materials with unusual properties. The aims of the present paper are first to give a short overview of this research field and then to consider tangled, yet unclear issues and outline the ways of oncoming studies. A special emphasis is given on the specific structure of grain boundaries in ultrafine grained materials processed by SPD, on grain boundary segregation, on interfacial mixing linked to heterophase boundaries and on grain boundary diffusion. The connection between these unique features and the mechanical properties or the thermal stability of the ultrafine grained alloys is also discussed.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/83a1290976ebf96d40062d75e178f113598a1bc8
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In Materials Chemistry
- Yuntian Zhu
- Terence G. Langdon
- R. Valiev
- Z. Horita
- I. Ovid’ko
- Yuri Estrin
- Michael Zehetbauer
- Kei Ameyama
Citations in the corpus
- Harmonic-structured copper: performance and proof of fabrication concept based on severe plastic deformation of powders (2014, background): “However, the downside of homogeneous UFG materials is typically in a low elongation [14, 15].”
- Mechanical properties, microstructure and thermal stability of a nanocrystalline CoCrFeMnNi high-entropy alloy after severe plastic deformation (2015, background): “This is often associated with internal stresses or strains related to the non-equilibrium nature of grain boundaries in severely plastically deformed materials [28].”
- Review on superior strength and enhanced ductility of metallic nanomaterials (2018, background): “GBs of various kinds can be generated in NS materials processed by SPD (large and small-angle, special and random, equilibrium and non-equilibrium GBs with containing extrinsic dislocations) [1,81,295,296] and this is the basis for GB engineering of NS materials, i.”
- Fundamentals of Superior Properties in Bulk NanoSPD Materials (2016, background): “[35] However, increasing strength of metals and alloys through grain refinement by SPD usually leads to an undesirable drop in their ductility.[8,10,36,37] The low ductility is caused by the reduction of the strain-hardening capability of a severely deformed material.”