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.

Effect of process control agent on alloying and mechanical behavior of L21 phase Ni–Ti–Al alloys

2019 ◽  
Vol 740-741 ◽  
pp. 130-136 ◽  
Author(s):  
Jun Shi ◽  
Aofeng Zheng ◽  
Zehui Lin ◽  
Rong Chen ◽  
Jugong Zheng ◽  
...  
Keyword(s):  
Process Control ◽  
Mechanical Behavior ◽  
Control Agent ◽  
Al Alloys ◽  
Process Control Agent

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.

ROLE OF PROCESS CONTROL AGENT ON MECHANICAL ALLOYING OF NANO STRUCTURED TiAl-BASED ALLOY

2008 ◽  
Vol 22 (18n19) ◽  
pp. 2933-2938 ◽  
Author(s):  
H. BAHMANPOUR ◽  
S. HESHMATI-MANESH
Keyword(s):  
Process Control ◽  
Stearic Acid ◽  
Milled Powder ◽  
High Energy ◽  
Control Agent ◽  
X Ray Diffraction ◽  
Process Control Agent ◽  
Crystallite Sizes ◽  
Energy Ball ◽  
Milled Powders

High energy ball milling was performed on a mixture of titanium and aluminum elemental powders with a composition of Ti -48(at.%) Al . Stearic acid was added to this powder mixture as a process control agent (PCA) to study its effect on the microstructure evolution and crystallite size of the milled powder after various milling times. Phase compositions and morphology of the milled powders were evaluated using X-ray diffraction and scanning electron microscopy. Crystallite sizes of milled powders were determined by Cauchy-Gaussian approach using XRD profiles. It was shown that addition of 1wt.% of stearic acid not only minimizes the adhesion of milling product to the vial and balls, but also reduces its crystallite sizes. It has also a marked effect on the morphology of the final product.

Sign in / Sign up

Export Citation Format

Share Document