scholarly journals Correlating Microstrain and Activated Slip Systems with Mechanical Properties within Rotary Swaged WNiCo Pseudoalloy

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 208 ◽  
Author(s):  
Pavel Strunz ◽  
Lenka Kunčická ◽  
Přemysl Beran ◽  
Radim Kocich ◽  
Charles Hervoches
Keyword(s):  
Mechanical Properties ◽  
Thermomechanical Processing ◽  
Radiation Shielding ◽  
Tungsten Heavy Alloy ◽  
Slip Systems ◽  
Soft Matrix ◽  
Heavy Alloys ◽  
Dislocation Densities ◽  
Tungsten Heavy Alloys ◽  
Edge Dislocations

Due to their superb mechanical properties and high specific mass, tungsten heavy alloys are used in demanding applications, such as kinetic penetrators, gyroscope rotors, or radiation shielding. However, their structure, consisting of hard tungsten particles embedded in a soft matrix, makes the deformation processing a challenging task. This study focused on the characterization of deformation behavior during thermomechanical processing of a WNiCo tungsten heavy alloy (THA) via the method of rotary swaging at various temperatures. Emphasis is given to microstrain development and determination of the activated slip systems and dislocation density via neutron diffraction. The analyses showed that the grains of the NiCo2W matrix refined significantly after the deformation treatments. The microstrain was higher in the cold swaged sample (44.2 × 10−4). Both the samples swaged at 20 °C and 900 °C exhibited the activation of edge dislocations with <111> {110} or <110> {111} slip systems, and/or screw dislocations with <110> slip system in the NiCo2W matrix. Dislocation densities were determined and the results were correlated with the final mechanical properties of the swaged bars.

scholarly journals Effect of Transition Metals Oxides on the Physical and Mechanical Properties of Sintered Tungsten Heavy Alloys

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 825
Author(s):  
Ayman H. Elsayed ◽  
Mohamed A. Sayed ◽  
Osama M. Dawood ◽  
Walid M. Daoush
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Electrode Materials ◽  
Electrical Discharge Machining ◽  
Electrical Contact ◽  
Transition Element ◽  
Physical And Mechanical Properties ◽  
Tungsten Heavy Alloy ◽  
Heavy Alloys ◽  
Tungsten Heavy Alloys

The addition of transition element oxides to tungsten heavy alloys (WHAs) fabricated by powder metallurgy technique provides new materials with higher density and electrical conductivity, which may be adequate in some applications such as kinetic energy penetrators. Additionally, materials with higher electrical conductivity are required for electrical contact applications such as electrical discharge machining (EDM) electrode materials. WHAs were fabricated by compacting its mixed constituents followed by sintering. Ni, Co and Fe are used as binding phases of the tungsten particles and oxides of Zr, Ti and Y are used as oxide dispersing strengthening (ODS) agents of the sintered materials. The results show that all of the chosen factors (i.e., pressure of compaction process, temperature of sintering, type of binding material and type of oxide) have clear effects on all properties of ODS tungsten heavy alloy specimens. The density and electrical conductivity increase with the increase in sintering temperature. Hardness and compression strength were also measured to evaluate the mechanical properties of sintered samples.

DENSALLOY DENS21/DENS23/DENS25

Alloy Digest ◽  
2005 ◽  
Vol 54 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Radiation Shielding ◽  
Heavy Alloys ◽  
Tungsten Heavy Alloys

Abstract Densalloy alloys are tungsten heavy alloys for applications ranging from use in radiation shielding to use in pins for ejection molding. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming and machining. Filing Code: W-27. Producer or source: Tungsten Products, An Allegheny Technologies Company.

Refractory metal alloying: A new method for improving mechanical properties of tungsten heavy alloys

2017 ◽  
Vol 709 ◽  
pp. 609-619 ◽  
Author(s):  
U. Ravi Kiran ◽  
A. Panchal ◽  
M. Prem Kumar ◽  
M. Sankaranarayana ◽  
G.V.S. Nageswara Rao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Refractory Metal ◽  
New Method ◽  
Heavy Alloys ◽  
Tungsten Heavy Alloys

scholarly journals Effects of Sintering Conditions on Structures and Properties of Sintered Tungsten Heavy Alloy

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2338 ◽  
Author(s):  
Lenka Kunčická ◽  
Radim Kocich ◽  
Zuzana Klečková
Keyword(s):  
Sintering Temperature ◽  
Heavy Alloy ◽  
Tungsten Heavy Alloy ◽  
Fabrication Technology ◽  
Sintering Time ◽  
Heavy Alloys ◽  
Structures And Properties ◽  
Processing Step ◽  
Tungsten Heavy Alloys ◽  
Subsequent Quenching

Probably the most advantageous fabrication technology of tungsten heavy alloys enabling the achievement of required performance combines methods of powder metallurgy and processing by intensive plastic deformation. Since the selected processing conditions applied for each individual processing step affect the final structures and properties of the alloys, their optimization is of the utmost importance. This study deals with thorough investigations of the effects of sintering temperature, sintering time, and subsequent quenching in water on the structures and mechanical properties of a 93W6Ni1Co tungsten heavy alloy. The results showed that sintering at temperatures of or above 1525 °C leads to formation of structures featuring W agglomerates surrounded by the NiCo matrix. The sintering time has non-negligible effects on the microhardness of the sintered samples as it affects the diffusion and structure softening phenomena. Implementation of quenching to the processing technology results in excellent plasticity of the green sintered and quenched pieces of almost 20%, while maintaining the strength of more than 1000 MPa.

Microstructure and mechanical properties of novel tungsten heavy alloys prepared using FeNiCoCrCu HEA as binder

2022 ◽  
Vol 832 ◽  
pp. 142451
Author(s):  
Ajit Panigrahi ◽  
Tarini S. Acharya ◽  
Pradyut Sengupta ◽  
Deepak Kumar ◽  
Lingaraj Sarangi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microstructure And Mechanical Properties ◽  
Heavy Alloys ◽  
Tungsten Heavy Alloys

Investigation of Application Possibilities of Re-Ni Alloy Powder to Tungsten Heavy Alloys Production

2016 ◽  
Vol 251 ◽  
pp. 14-19 ◽  
Author(s):  
Tomasz Majewski ◽  
Katarzyna Leszczyńska-Sejda
Keyword(s):  
Mechanical Properties ◽  
Production Process ◽  
Alloy Powder ◽  
Thermal Reduction ◽  
Cold Isostatic Pressing ◽  
Optimal Conditions ◽  
Heavy Alloys ◽  
Ni Alloy ◽  
Tungsten Heavy Alloys ◽  
Ammonia Atmosphere

The experiments results connected to possibilities of use of Re-Ni alloy powder for tungsten heavy alloys production were presented in the paper. This powder was obtained by nickel (II) perrhenate reduction under dissociated ammonia atmosphere. The optimal conditions for the thermal reduction for nickel (II) perrhenate were determined. The production process of investigated sinters contained, among others, cold isostatic pressing and two-staged sintering. Selected results of microstructure investigation and mechanical properties of obtained sinters were shown. Performed research indicated that the application of nickel (II) perrhenate to manufacture tungsten heavy alloys resulted in material with the microstructure typical of tungsten heavy alloys and characterized by high mechanical properties.

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