Grain boundary wetting phase transition and analysis of the energy characteristics of grain boundaries in the Sns-(Zn/Sn)l system

A theoretical model is proposed that describes the mechanism of hardening of ultrafine-grained aluminum, obtained by severe plastic torsion deformation, after low-temperature annealing. In the framework of the model, hardening is realized due to the sequential transformation of the grain-boundary dislocation structure. In particular, plastic deformation occurs through the emission of lattice dislocations from triple junctions of grain boundaries containing pile-ups of grain-boundary dislocations, the subsequent sliding of lattice dislocations in the bulk of the grain, and the formation of walls of grain-boundary dislocations climbing along opposite grain boundaries. The energy characteristics and critical stresses for the emission of lattice dislocations are calculated. The theoretical dependences of the flow stress on the plastic deformation are plotted, which show good qualitative and quantitative agreement with experimental data.

Download Full-text

Grain boundary wetting of different types of grain boundaries in the Cu–Ag system

Materials Letters ◽

10.1016/j.matlet.2020.127730 ◽

2020 ◽

Vol 272 ◽

pp. 127730 ◽

Cited By ~ 6

Author(s):

Ivan Mazilkin ◽

Kristina Tsoy ◽

Alexander Straumal ◽

Alexey Rodin ◽

Brigitte Baretzky

Keyword(s):

Grain Boundary ◽

Grain Boundaries ◽

Different Types ◽

Grain Boundary Wetting

Download Full-text

In situ investigation of liquid Ga penetration in Al bicrystal grain boundaries: grain boundary wetting or liquid metal embrittlement?

Acta Materialia ◽

10.1016/j.actamat.2004.09.012 ◽

2005 ◽

Vol 53 (1) ◽

pp. 151-162 ◽

Cited By ~ 69

Author(s):

W. Ludwig ◽

E. Pereiro-López ◽

D. Bellet

Keyword(s):

Liquid Metal ◽

Grain Boundary ◽

Grain Boundaries ◽

Liquid Metal Embrittlement ◽

In Situ Investigation ◽

Grain Boundary Wetting

Download Full-text

The Grain Boundary Wetting in the Sn– 25 at% In Alloys

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.258-260.491 ◽

2006 ◽

Vol 258-260 ◽

pp. 491-496 ◽

Cited By ~ 3

Author(s):

C.H. Yeh ◽

L.S. Chang ◽

Boris B. Straumal

Keyword(s):

Phase Transition ◽

Phase Diagram ◽

Grain Boundary ◽

Annealing Temperature ◽

Bulk Phase ◽

Bulk Phase Diagram ◽

Tie Lines ◽

Grain Boundary Wetting ◽

Increasing Temperature

The grain boundary (GB) wetting was investigated in the Sn – 25 at.% In alloy. It was found that the portion of GBs wetted by the melt depends on the annealing temperature. No GB completely wetted by melt was observed at 140°C, while all GBs were fully wetted after annealing at 180°C. Between 140°C and 180°C the portion of wetted GBs increases with increasing temperature. The tie-lines of GB wetting phase transition were constructed in the Sn–In bulk phase diagram.

Download Full-text

Pressure influence on the grain boundary wetting phase transition in FeSi alloys

Acta Materialia ◽

10.1016/s1359-6454(96)00332-1 ◽

1997 ◽

Vol 45 (5) ◽

pp. 1931-1940 ◽

Cited By ~ 50

Author(s):

B. Straumal ◽

E. Rabkin ◽

W. Łojkowski ◽

W. Gust ◽

L.S. Shvindlerman

Keyword(s):

Phase Transition ◽

Grain Boundary ◽

Grain Boundary Wetting

Download Full-text

Pseudopartial Grain Boundary Wetting: Key to the Thin Intergranular Layers

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.333.175 ◽

2013 ◽

Vol 333 ◽

pp. 175-192 ◽

Cited By ~ 16

Author(s):

Boris B. Straumal ◽

Alexey Rodin ◽

A.E. Shotanov ◽

Alexander B. Straumal ◽

Olga A. Kogtenkova ◽

...

Keyword(s):

Contact Angle ◽

Phase Transitions ◽

Grain Boundary ◽

Grain Boundaries ◽

Thin Layers ◽

Second Phase ◽

Triple Junctions ◽

Complete Wetting ◽

Grain Boundary Wetting

The thin layers of a second phase (also called complexions) in grain boundaries (GB) and triple junctions (TJs) are more and more frequently observed in polycrystals. The prewetting (or premelting) phase transitions were the first phenomena proposed to explain their existence. The deficit of the wetting phase in case of complete wetting can also lead to the formation of thin GB and TJ phases. However, only the phenomenon of pseudopartial (or pseudoincomplete, or constrained complete) wetting permitted to explain, how the thin GB film can exist in the equilibrium with GB lenses of a second phase with non-zero contact angle.

Download Full-text

Segregation and Phase Transitions in Grain Boundaries

Diffusion Foundations ◽

10.4028/www.scientific.net/df.22.160 ◽

2019 ◽

Vol 22 ◽

pp. 160-169

Author(s):

Boris Bokstein ◽

Alexey Rodin ◽

Aleksei Itckovich ◽

Leonid Klinger

Keyword(s):

Phase Transition ◽

Phase Transitions ◽

Grain Boundary ◽

Grain Boundaries ◽

Computer Modeling ◽

Boundary Segregation ◽

Short Description ◽

Grain Boundary Segregation ◽

Atomic Interactions

The paper is devoted to some properties of grain boundaries: Segregation and concentration phase transitions – two important consequences of atomic interactions in grain boundaries. Except of a short description the Gibbs method of surface excesses and grain boundary segregation isotherms with the limited number of segregation sites in grain boundary, the paper concentrates on the effects of complexes formation, including thermodynamic and computer modeling, and concentration phase transition in the grain boundaries in systems with restricted solubility and intermediate compounds.

Download Full-text