Effect of Compaction Pressure on Microstructure and Properties of Copper-Based Composite Prepared by Mechanical Alloying and Powder Metallurgy

2013 ◽  
Vol 795 ◽  
pp. 343-346 ◽  
Author(s):  
Y. Mahani ◽  
Zuhailawati Hussain
Keyword(s):  
Electrical Conductivity ◽  
Powder Metallurgy ◽  
Mechanical Alloying ◽  
Tungsten Carbide ◽  
Compaction Pressure ◽  
Microstructure And Properties ◽  
Carbide Composite ◽  
Tungsten Carbide Composite

In this study, copper-tungsten carbide composite was produced by mechanical alloying and powder metallurgy. The compaction pressures were varied from 100 to 600 MPa for observation on microstructure and properties of the composite. The result showed the microstructure was densified with the increased of compaction pressure. Within compaction pressure no fracturing was occurred. Increasing compaction pressure increased the density, hardness and electrical conductivity of the composite which related to the reduced of porosity area.

scholarly journals Effect of Ball Size on Nanostructured Copper-tungsten Carbide Composite Prepared by Mechanical Alloying

2013 ◽  
Vol 1 (2) ◽  
pp. 31-34
Author(s):  
Mahani Yusoff ◽  
Zuhailawati H
Keyword(s):  
Mechanical Alloying ◽  
Tungsten Carbide ◽  
Crystallite Size ◽  
Impact Energy ◽  
Ball Mill ◽  
Collision Frequency ◽  
Ball Size ◽  
Carbide Composite ◽  
Tungsten Carbide Composite ◽  
Nanostructured Copper

In this study, nanostructured copper tungsten carbide composite was produced by mechanical alloying. Mechanical alloying was carried out by milling of copper (Cu), tungsten (W) and graphite mixture at 40 h with milling speed of 400 rpm in planetary ball mill using two different ball sizes. The crystallite size of the powder milled with 10 mm ball is smaller than 20 mm ball due to higher collision frequency. Lower expansion of Cu lattice was found for the powder milled with 20 mm ball than that of 10 mm ball. The composite obtain by milling with 20 mm ball had produced greater impact energy that facilitated the formation of tungsten carbide (WC).

scholarly journals Numerical Modelling and Optimization of Two-Dimensional Phononic Band Gaps in Elastic Metamaterials with Square Inclusions

2021 ◽  
Vol 11 (7) ◽  
pp. 3124
Author(s):  
Alya Alhammadi ◽  
Jin-You Lu ◽  
Mahra Almheiri ◽  
Fatima Alzaabi ◽  
Zineb Matouk ◽  
...  
Keyword(s):  
Elastic Wave ◽  
Tungsten Carbide ◽  
Composite Structure ◽  
Elastic Waves ◽  
Wave Attenuation ◽  
Low Frequency ◽  
Filling Fraction ◽  
Carbide Composite ◽  
Elastic Metamaterials ◽  
Tungsten Carbide Composite

A numerical simulation study on elastic wave propagation of a phononic composite structure consisting of epoxy and tungsten carbide is presented for low-frequency elastic wave attenuation applications. The calculated dispersion curves of the epoxy/tungsten carbide composite show that the propagation of elastic waves is prohibited inside the periodic structure over a frequency range. To achieve a wide bandgap, the elastic composite structure can be optimized by changing its dimensions and arrangement, including size, number, and rotation angle of square inclusions. The simulation results show that increasing the number of inclusions and the filling fraction of the unit cell significantly broaden the phononic bandgap compared to other geometric tunings. Additionally, a nonmonotonic relationship between the bandwidth and filling fraction of the composite was found, and this relationship results from spacing among inclusions and inclusion sizes causing different effects on Bragg scatterings and localized resonances of elastic waves. Moreover, the calculated transmission spectra of the epoxy/tungsten carbide composite structure verify its low-frequency bandgap behavior.

Sign in / Sign up

Export Citation Format

Share Document