Characterization Investigations of Mechanically Alloyed and Sintered Al – 4 wt.% Cu Matrix Composites Reinforced with Mechanochemically Synthesized Chromium Boride/Nitride Particles

2021 ◽  
pp. 106727
Author(s):  
Sıddıka MERTDİNÇ ◽  
Mert KILIK ◽  
Şennur BALTAŞ ◽  
Alper Kaan TAŞKIN ◽  
M. Lütfi ÖVEÇOĞLU ◽  
...  
Keyword(s):  
Matrix Composites ◽  
Mechanically Alloyed ◽  
Chromium Boride

scholarly journals Conditions for Production of Composite Material Based on Aluminum and Carbon Nanofibers and Its Physic-Mechanical Properties

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 550 ◽  
Author(s):  
Oleg Tolochko ◽  
Tatiana Koltsova ◽  
Elizaveta Bobrynina ◽  
Andrei Rudskoy ◽  
Elena Zemtsova ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Carbon Nanostructures ◽  
Pure Aluminum ◽  
Metallic Matrix ◽  
Chemical Vapor ◽  
Matrix Composites ◽  
Mechanically Alloyed ◽  
Alumina Particles ◽  
Composite Microstructure

Aluminum-based metallic matrix composites reinforced by carbon nanofibers (CNFs) are important precursors for development of new light and ultralight materials with enhanced properties and high specific characteristics. In the present work, powder metallurgy technique was applied for production of composites based on reinforcement of aluminum matrices by CNFs of different concentrations (0~2.5 wt%). CNFs were produced by chemical vapor deposition (CVD) and mechanical activation. We determined that in situ synthesis of carbon nanostructures with subsequent mechanic activation provides satisfactory distribution of nanofibers and homogeneous composite microstructure. Introduction of 1 vol% of flux (0.25 NaCl + 0.25 KCl + 0.5 CaF2) during mechanic activation helps to reduce the strength of the contacts between the particles. Additionally, better reinforcement of alumina particles and strengthening the bond between CNFs and aluminum are observed due to alumina film removal. Introduction of pure aluminum into mechanically alloyed powder provides the possibility to control composite durability, plasticity and thermal conductivity.

Development of Mechanically Alloyed and Sintered W-1 wt.% Ni Matrix Composites Reinforced with TiB2

2012 ◽  
Vol 194 ◽  
pp. 194-198 ◽  
Author(s):  
Duygu Ağaoğulları ◽  
Özge Balci ◽  
Ö. Utku Demirkan ◽  
Hasan Gökçe ◽  
Aziz Genç ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Relative Density ◽  
Physical And Mechanical Properties ◽  
Matrix Composites ◽  
Combined Method ◽  
Mechanically Alloyed ◽  
Activated Sintering ◽  
Sintering Aid ◽  
Reinforcing Agent

Due to improve the physical and mechanical properties of Ni activated W compacts, TiB2 was added to the W-Ni matrix as reinforcing agent. W-Ni matrix composites were fabricated by using a combined method of mechanical alloying (MA), cold pressing and activated sintering. The amount of activated sintering aid (Ni) was kept constant as 1 wt.%. The effects of TiB2 content and mechanical alloying duration on the physical, microstructural and mechanical properties of activated sintered W-Ni compacts were investigated. The results showed that TiB2 particles have a significant effect on the density and microhardness values of the sintered samples. After MA and sintering, formation of W2B and NiTi intermetallic compounds were observed because of the decomposition of TiB2. The relative density value of 91.21 % and microhardness value of 4.08±0.28 GPa of W-1 wt.% Ni samples respectively increased to 94.88 % and 5.64±0.28 GPa with the addition of 2 wt.% TiB2.

Study of Mechanical Properties of an LM24 Composite Alloy Reinforced with Cu-CNT Nanofillers, Processed Using Ultrasonic Cavitation

2013 ◽  
Vol 765 ◽  
pp. 245-249 ◽  
Author(s):  
Alberto Miranda ◽  
Noe Alba-Baena ◽  
Brian J. McKay ◽  
Dmitry G. Eskin ◽  
Se Hyun Ko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ultrasonic Cavitation ◽  
Unreinforced Alloy ◽  
Matrix Composites ◽  
Mechanically Alloyed ◽  
Composite Powders ◽  
Aluminium Matrix Composite ◽  
Applied Loading ◽  
Significant Difference ◽  
Pressure Die Casting

This study investigates the effect of Cu-Carbon Nanotube (Cu-CNT´s) composite powders on the mechanical properties of an Al-Si9.5-Cu4-Fe1.3 wt.% (LM24) aluminium matrix composite (AMC). Carbon nanotubes (CNT’s) can exhibit exceptional mechanical properties, e.g. stiffness up to 1000 GPa and strength in the order of 100 GPa. In recent years there has been significant scientific interest in improving properties in conventional alloys, via fabricating CNT metal matrix composites in order to attempt to harness their extraordinary attributes. In this study mechanically alloyed Cu-CNTS powders were added to molten LM24. The melt was processed using ultrasonic cavitation and subsequently high pressure die casting to form as-cast tensile specimens. SEM results indicate that CNT’s can be successfully introduced into the melt using this method. Compared to the unreinforced alloy, the CNT additions resulted in an increment (~20±10 MPa) to both ultimate tensile strength and yield strength, with a corresponding decline (~1±0.5l %) in elongation. This observed increase in strengthening may be attributed to the CNT’s pinning and hindering both grain boundary and dislocation migration during applied loading. Interestingly, no significant difference in properties were found with an increase in the CNT content (from 0.05 to 0.1 wt.%) potentially indicating a saturation limit.

Sign in / Sign up

Export Citation Format

Share Document