The temperature dependence of grain boundary wetting in liquid phase sintered Fe-Cu alloys

1981 ◽  
Vol 12 (11) ◽  
pp. 1987-1988 ◽  
Author(s):  
A. N. Niemi ◽  
T. H. Courtney
Keyword(s):  
Liquid Phase ◽  
Grain Boundary ◽  
Temperature Dependence ◽  
Cu Alloys ◽  
Grain Boundary Wetting

Low Angle Grain Boundary Dewetting in Sapphire

2001 ◽  
Vol 7 (S2) ◽  
pp. 384-385
Author(s):  
B.J. Hockey ◽  
M-K. Kang ◽  
S.M. Wiederhorn ◽  
J.E. Blendell
Keyword(s):  
Liquid Phase ◽  
Grain Boundary ◽  
Liquid Phase Sintering ◽  
Sintering Process ◽  
Transmission Electron ◽  
Wide Range ◽  
Grain Boundary Wetting ◽  
Tape Cast ◽  
Single Boundary ◽  
Current Emphasis

The structure and composition of low angle grain boundaries produced in sapphire by a liquid phase sintering process were investigated by conventional and high resolution transmission electron microscopy (CTEM and HRTEM, respectively). Considering the current emphasis on producing ceramics with textured microstructures for various applications, the question of grain boundary wetting vs. dewetting has become a relevant issue to determining the microstructure development and the properties of these liquid phase sintered materials. Accordingly, the present study was designed to cover a wide range of tilt misorientations, twist misorientations, and boundary orientations.The boundaries were formed by the directed growth of two sapphire plates, both having nominal <0001>, , or surface orientations through an alumina tape-cast containing an anorthite composition glass phase. After an initial hot-pressing stage, followed by an anneal at 1600° C for 200 hours, the samples typically contained a single boundary delineated by isolated pockets of entrapped glass, Fig. 1.

scholarly journals The Grain Boundary Wetting Phenomena in the Ti-Containing High-Entropy Alloys: A Review

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1881
Author(s):  
Boris B. Straumal ◽  
Anna Korneva ◽  
Alexei Kuzmin ◽  
Gabriel A. Lopez ◽  
Eugen Rabkin ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Grain Boundary ◽  
Principal Components ◽  
Contact Angles ◽  
Second Phase ◽  
High Entropy Alloys ◽  
Grain Boundary Engineering ◽  
High Entropy ◽  
Tie Lines ◽  
Grain Boundary Wetting

In this review, the phenomenon of grain boundary (GB) wetting by melt is analyzed for multicomponent alloys without principal components (also called high-entropy alloys or HEAs) containing titanium. GB wetting can be complete or partial. In the former case, the liquid phase forms the continuous layers between solid grains and completely separates them. In the latter case of partial GB wetting, the melt forms the chain of droplets in GBs, with certain non-zero contact angles. The GB wetting phenomenon can be observed in HEAs produced by all solidification-based technologies. GB leads to the appearance of novel GB tie lines Twmin and Twmax in the multicomponent HEA phase diagrams. The so-called grain-boundary engineering of HEAs permits the use of GB wetting to improve the HEAs’ properties or, alternatively, its exclusion if the GB layers of a second phase are detrimental.

scholarly journals Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7506
Author(s):  
Boris B. Straumal ◽  
Anna Korneva ◽  
Gabriel A. Lopez ◽  
Alexei Kuzmin ◽  
Eugen Rabkin ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Grain Boundary ◽  
Solid Phase ◽  
High Entropy Alloys ◽  
Grain Boundary Engineering ◽  
Phase Form ◽  
High Entropy ◽  
The Matrix ◽  
Tie Lines ◽  
Grain Boundary Wetting

In this review, the phenomenon of grain boundary (GB) wetting by the second solid phase is analyzed for the high entropy alloys (HEAs). Similar to the GB wetting by the liquid phase, the GB wetting by the second solid phase can be incomplete (partial) or complete. In the former case, the second solid phase forms in the GB of a matrix, the chain of (usually lenticular) precipitates with a certain non-zero contact angle. In the latter case, it forms in the GB continuous layers between matrix grains which completely separate the matrix crystallites. The GB wetting by the second solid phase can be observed in HEAs produced by all solidification-based technologies. The particle chains or continuous layers of a second solid phase form in GBs also without the mediation of a liquid phase, for example by solid-phase sintering or coatings deposition. To describe the GB wetting by the second solid phase, the new GB tie-lines should be considered in the two- or multiphase areas in the multicomponent phase diagrams for HEAs. The GB wetting by the second solid phase can be used to improve the properties of HEAs by applying the so-called grain boundary engineering methods.

Grain Boundary Wetting in the Nd-Fe-B-Based Alloy

2017 ◽  
Vol 380 ◽  
pp. 173-180 ◽  
Author(s):  
Andrey Mazilkin ◽  
Boris Straumal ◽  
Svetlana Protasova ◽  
Brigitte Baretzky
Keyword(s):  
Contact Angle ◽  
Magnetic Properties ◽  
Liquid Phase ◽  
Grain Boundary ◽  
Permanent Magnets ◽  
High Coercivity ◽  
Sintered Alloy ◽  
Triple Junctions ◽  
Grain Boundary Wetting

The microstructure of Nd–Fe–B-based liquid-phase sintered alloy has been studied. The Nd2Fe14B/Nd2Fe14B GBs can be pseudo-incompletely (or pseudo-partially) wetted by the Nd-rich melt. Such GBs form the non-zero contact angle with the melt in the triple junctions and contain the uniformly thin (7-10 nm) Nd-rich layer. Such GBs are different from the completely wetted as well as from partially wetted GBs. Most probably, such thin Nd-rich GB layers are responsible for the excellent magnetic properties of the NdFeB-base permanent magnets because these GB layers ensure the magnetic isolation between the Nd2Fe14B grains needed for the high coercivity.

Temperature dependence of the microhardness of beryllium single crystals and Be-Cu alloys

1975 ◽  
Vol 7 (10) ◽  
pp. 1251-1254
Author(s):  
S. S. Avotin ◽  
I. I. Papirov ◽  
G. F. Tikhinskii ◽  
A. D. Tkalenko ◽  
V. G. Tkachenko ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Single Crystals ◽  
Cu Alloys

Temperature dependence of fractal dimension of grain boundary region in SnO2 based ceramics

2006 ◽  
Vol 41 (19) ◽  
pp. 6193-6197 ◽  
Author(s):  
Goran Branković ◽  
Zorica Branković ◽  
Daniela Russo Leite ◽  
José Arana Varela
Keyword(s):  
Fractal Dimension ◽  
Grain Boundary ◽  
Temperature Dependence ◽  
Boundary Region

Temperature dependence of faceting in ∑5(310)[001] grain boundary of SrTiO3 [Acta Materialia 51(4), pp. 975–981]

2003 ◽  
Vol 51 (5) ◽  
pp. 1505
Author(s):  
Sung Bo Lee ◽  
Wilfried Sigle ◽  
Wolfgang Kurtz ◽  
Manfred Rühle
Keyword(s):  
Grain Boundary ◽  
Temperature Dependence
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