Effect of the Preparation Methods of Me+Al Powder Blends on the Compaction Behavior, Structure, Phase Transformations, and Properties of the Compacted Aluminides of Transition Metals

2007 ◽  
pp. 513-516
Author(s):  
K.B. Povarova ◽  
N.K. Kazanskaya ◽  
A.A. Drozdov ◽  
A.E. Morozov ◽  
A.G. Nikolaev
Keyword(s):  
Transition Metals ◽  
Phase Transformations ◽  
Preparation Methods ◽  
Compaction Behavior ◽  
Structure Phase ◽  
Powder Blends ◽  
Al Powder

Effect of the Preparation Methods of Me+Al Powder Blends on the Compaction Behavior, Structure, Phase Transformations, and Properties of the Compacted Aluminides of Transition Metals

2007 ◽  
Vol 534-536 ◽  
pp. 513-516 ◽  
Author(s):  
K.B. Povarova ◽  
N.K. Kazanskaya ◽  
A.A. Drozdov ◽  
A.E. Morozov ◽  
A.G. Nikolaev
Keyword(s):  
High Temperature ◽  
Exothermic Reaction ◽  
Internal Stresses ◽  
Composite Particles ◽  
Reaction Sintering ◽  
Preparation Methods ◽  
Compaction Behavior ◽  
Al Composite ◽  
Powder Blends ◽  
Al Powder

The effect of the methods for preparing powder blend by conventional milling (Me+Al particles), attriting (Me/Al/ Me/Al composite particles), and plating of Me by Al (Me/Al composite particles) on the structure, internal stress level, and compactability of the powder blends as well as the structure and phase composition of the MeAl compacts was investigated. The Me+Al→MeAl exothermic reaction of these powders occurs at T≥650°C. The reaction sintering (RS) or hightemperature self-propagation synthesis (HTSPS) occurs through the formation of Al melt (liquidphase reaction) and lower-melting MeAl3, Me2Al3, Me3Al aluminides. An increase in the level of internal stresses (IS) upon attritting activates RS at lower temperatures and decreases the value of high-temperature exoeffect. This suppresses the HTSPS development. A large high-temperature exoeffect ensures the intensity and completeness of the reaction interaction, and the application of pressure upon RS or HTSPS provides a high, near-theoretical density of the compacted material.

The formation of metastable Ti–Al solid solutions by mechanical alloying and ball milling

1993 ◽  
Vol 8 (11) ◽  
pp. 2819-2829 ◽  
Author(s):  
M. Oehring ◽  
T. Klassen ◽  
R. Bormann
Keyword(s):  
Solid Solution ◽  
Mechanical Alloying ◽  
Ball Milling ◽  
Intermetallic Compounds ◽  
Phase Formation ◽  
Milling Process ◽  
Study Phase ◽  
Phase Selection ◽  
Powder Blends ◽  
Al Powder

Elemental Ti–Al powder blends were mechanically alloyed in order to study phase formation during the alloying process. In addition, the stability of intermetallic phases upon milling was investigated separately in order to determine the origins of phase selection during the milling process. It was found that by mechanical alloying of powder blends, as well as by ball milling of Ti-aluminides for long milling times, the same metastable phases were formed for corresponding compositions, i.e., the hep solid solution for Al concentrations up to 60 at. % and the fcc solid solution for 75 at. % Al. X-ray diffraction (XRD) analyses indicated that the process of mechanical alloying occurred via the diffusion of Al into Ti. By lowering the milling intensity, a two-phase mixture of the hcp solid solution and the amorphous phase was observed for Ti50Al50 and confirmed by transmission electron microscopy (TEM). The results show that phase selection in the final state during mechanical alloying of Ti–Al powder blends and milling of intermetallic compounds is mainly determined by the energetic destabilization of the competing phases caused by the milling process. The destabilization is most pronounced in the case of intermetallic compounds due to the decrease in long-range order upon milling. For the final milling stage, phase formation can be predicted by considering the relative stabilities of the respective phases calculated by the CALPHAD method using the available thermodynamic data for the Ti–Al system.

Continuous detection of the torque during shear deformation as a method for estimating the evolution of structure-phase transformations

2014 ◽  
Vol 2014 (10) ◽  
pp. 846-852 ◽  
Author(s):  
E. A. Pechina ◽  
S. M. Ivanov ◽  
V. I. Lad’yanov ◽  
D. I. Chukov ◽  
G. A. Dorofeev ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Shear Deformation ◽  
Structure Phase ◽  
Evolution Of Structure

Structure, phase transformations and properties of the TiNi-TiCu alloys subjected to high pressure torsion

2017 ◽  
Vol 4 (3) ◽  
pp. 4846-4850 ◽  
Author(s):  
Alexander Lukyanov ◽  
Natalia Kuranova ◽  
Artem Pushin ◽  
Vladimir Pushin ◽  
Dmitry Gunderov
Keyword(s):  
High Pressure ◽  
Phase Transformations ◽  
High Pressure Torsion ◽  
Structure Phase

Metal nanoantimicrobials for textile applications

2013 ◽  
Vol 2 (3) ◽  
pp. 307-331 ◽  
Author(s):  
Lorena Carla Giannossa ◽  
Daniela Longano ◽  
Nicoletta Ditaranto ◽  
Maria Angela Nitti ◽  
Federica Paladini ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Transition Metals ◽  
Mechanism Of Action ◽  
Short Description ◽  
The Novel ◽  
Preparation Methods ◽  
Silver Copper ◽  
History Of ◽  
History Of Use ◽  
Novel Applications

AbstractResearch on the nanomaterials containing one or more transition metals is growing tremendously, thanks to the large number of preparation processes available and to the novel applications that can be envisaged in several fields. This review presents an overview of the selected studies in the field of antimicrobial textiles, employing bioactive nanophases of elements/compounds such as silver, copper, or zinc oxide. In addition, the history of use of these antimicrobials and their mechanism of action are shortly reported. Finally, a short description is provided of the deposition/preparation methods, which are being used in the authors’ labs for the development of the textiles modified by the novel nanoantimicrobials.

The structure–phase transformations and mechanical properties of the shape memory effect alloys based on the system Cu–Al–Ni

2017 ◽  
Vol 4 (3) ◽  
pp. 4758-4762 ◽  
Author(s):  
Alexey E. Svirid ◽  
Vladimir G. Pushin ◽  
Natalia N. Kuranova ◽  
Alexandr V. Luk'yanov ◽  
ArtemV. Pushin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Phase Transformations ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Structure Phase

Effect of copper on the structure–phase transformations and the properties of quasi-binary TiNi–TiCu alloys

2016 ◽  
Vol 61 (4) ◽  
pp. 554-562 ◽  
Author(s):  
V. G. Pushin ◽  
N. N. Kuranova ◽  
A. V. Pushin ◽  
A. V. Korolev ◽  
N. I. Kourov
Keyword(s):  
Phase Transformations ◽  
Structure Phase ◽  
Effect Of Copper
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