scholarly journals Recent Progress in Processing of Tungsten Heavy Alloys

2014 ◽  
Vol 2014 ◽  
pp. 1-22 ◽  
Author(s):  
Y. Şahin
Keyword(s):  
Microwave Sintering ◽  
High Energy ◽  
Electrical Contacts ◽  
Matrix Composition ◽  
Powder Injection ◽  
Tungsten Particle ◽  
Two Phase ◽  
Heavy Alloys ◽  
Tungsten Heavy Alloys ◽  
Interface Bonding Strength

Tungsten heavy alloys (WHAs) belong to a group of two-phase composites, based on W-Ni-Cu and W-Ni-Fe alloys. Due to their combinations of high density, strength, and ductility, WHAs are used as radiation shields, vibration dampers, kinetic energy penetrators and heavy-duty electrical contacts. This paper presents recent progresses in processing, microstructure, and mechanical properties of WHAs. Various processing techniques for the fabrication of WHAs such as conventional powder metallurgy (PM), advent of powder injection molding (PIM), high-energy ball milling (MA), microwave sintering (MW), and spark-plasma sintering (SPS) are reviewed for alloys. This review reveals that key factors affecting the performance of WHAs are the microstructural factors such as tungsten and matrix composition, chemistry, shape, size and distributions of tungsten particles in matrix, and interface-bonding strength between the tungsten particle and matrix in addition to processing factors. SPS approach has a better performance than those of others, followed by extrusion process. Moreover, deformation behaviors of WHA penetrator and depleted uranium (DU) Ti alloy impacting at normal incidence both rigid and thick mild steel target are studied and modelled as elastic thermoviscoplastic. Height of the mushroomed region is smaller for α=0.3 and it forms sooner in each penetrator as compared to that for α=0.2.

scholarly journals Investigation of tungsten heavy alloys using powder metallurgy technique

2021 ◽  
Vol 13 (2) ◽  
pp. 130-136
Author(s):  
Arafa S. Sobha ◽  
◽  
Amr Adela ◽  
Abdelhay Mohameda ◽  
Ali Abd El-Atya ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Process Control ◽  
Sintering Temperature ◽  
Control Agent ◽  
Preparation Condition ◽  
Electrical Contacts ◽  
Nano Particle ◽  
Process Control Agent ◽  
Heavy Alloys ◽  
Tungsten Heavy Alloys

Recently, developing new alloys of Tungsten heavy (WHA) is the most important issue that researchers considered due to their wide applications of radiation protectors, vibration absorber, kinetic energy penetrators and heavy-duty electrical contacts. The present work shows 9 different Tungsten alloys with a variety of weight percent’s from "Graphene" as a Nano- particle additive. The proposed alloys produced by minimizing manufacturing parameters by applying the Taguchi technique. In addition, this work used to relate the Powder-Metallurgy (PM) parameters such as Sintering Temperature (ST) level, the weight % of the added Nano-particle of Graphene (Gw) and the type of Process Control Agent (PCA) with the mechanical characteristics such as Young’s modulus, modulus of Bulk, modulus of Shear, Poisson's number, Vickers hardness, Grain size , Relative Density. The results showed that specimen number 8 is given higher values of modulus of elasticity, reached 326.2 GPa, bulk value of 255.64 GPa, and shear value of 126.7 GPa with PM preparation condition at 15000C sintering temperature, stearic acid as a process control agent (PCA) and 0.0 %Wt. of Graphene.

scholarly journals Microwave sintering of tungsten heavy alloys

2018 ◽  
Vol 16 (2) ◽  
Author(s):  
G. Prabhu ◽  
M. Sankaranarayana ◽  
T. K. Nandy
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Microwave Sintering ◽  
Microstructural Parameters ◽  
Heavy Alloys ◽  
Tungsten Heavy Alloys ◽  
Conventional Sintering ◽  
Superior Mechanical Properties ◽  
High Tungsten Content ◽  
Full Densification

To understand microwave sintering of heavy alloys with high tungsten content, 93W-4.9Ni-2.1Fe alloy was sintered using a 6 kW, 2.45 GHz microwave sintering furnace at 1783 K (1510˚ºC) and 1793 K (1520˚ºC). The alloy sintered at 1793 K (1520˚ºC) achieved full densification and had improved microstructural features, superior mechanical properties compared to 99.4% densification and relatively inferior properties obtained in the alloy sintered at 1783 K (1510˚ºC). This study also includes a comparison between microwave sintered and conventionally sintered 93W-4.9Ni-2.1Fe alloy (sintered at 1793K (1520ºC)). Contrary to the full densification and superior mechanical properties obtained in microwave sintering, conventional sintering at 1793K (1520ºC) resulted in only 99.6% densification and substantially inferior properties. Analyses of microstructure and fracture surface revealed that key microstructural parameters such as tungsten grain size, tungsten-tungsten contiguity, matrix volume fraction and also the fracture mode were significantly different between the alloys processed by the two routes. Possible reasons behind dissimilar densification, significantly different microstructures and mechanical properties obtained between these two modes of sintering, are also discussed in this study.

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.

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