scholarly journals Mechanical characterization and fractography of 100 micron sized silicon carbide particles reinforced Al6061 alloy composites

10.30544/639 ◽  
2021 ◽  
Author(s):  
MADEVA NAGARAL ◽  
Murali Mohan R ◽  
V Auradi ◽  
Bharath V
Keyword(s):  
Silicon Carbide ◽  
Mechanical Performance ◽  
Fracture Mechanisms ◽  
Sic Particles ◽  
Al6061 Alloy ◽  
Sic Composites ◽  
Xrd Patterns ◽  
Silicon Carbide Particles ◽  
The Impact ◽  
Carbide Particles

In the current exploration, the impact of the 100 to 125 micron size addition of silicon carbide (SiC) on the mechanical performance of Al6061 alloy has been studied. The Al6061 alloy dispersed with 6, 9, and 12 wt.% of SiC particles were synthesized by a two-step stir cast route. Two-step addition of the preheated particles into the melt helps avoid the agglomeration of the particles, which further contributes to enhancing the properties of composites. The orchestrated composites were exposed to microstructural examines and mechanical properties evaluation. Microstructural portrayals of acquired examples were completed by SEM microscopy, EDS, and XRD patterns. The event of SiC particles were affirmed by the XRD patterns. The density of the Al6061-SiC composites was increased with the addition of high-density silicon carbide particles. The hardness, ultimate, and yield qualities of metal composites have been improved with the increase in the content of SiC support. The ductility of SiC reinforced composites decreased with hard ceramic particles' incorporation in the Al matrix alloy. Various fracture mechanisms were observed in the Al6061-SiC composites using SEM.

Co-Deposition of Binary Particles during Slip Casting Process

2011 ◽  
Vol 189-193 ◽  
pp. 2917-2920
Author(s):  
Yuan Li ◽  
Yue Qiu
Keyword(s):  
Silicon Carbide ◽  
Mechanical Performance ◽  
Carbon Sources ◽  
Slip Casting ◽  
Casting Process ◽  
Carbon Particles ◽  
Mould Wall ◽  
Sharp Edges ◽  
Silicon Carbide Particles ◽  
Carbide Particles

Co-deposition of silicon carbide particles and carbon (or carbon sources) particles is essential for preparation of reaction bonded silicon carbide (RBSC) products by slip casting. The way of co-depositing of silicon carbide particles and carbon particles during slip casting process, and the influence of composition of raw particles on particle co-depositing in green bodies were studied. The experiment results show: 1.Co-deposition of binary particles is greatly affected by particle size distribution, and large proportion of rigid SiC particles increases the difficulty in demoulding procedure because of small shrinkage; 2. Dispersants in deposited cake trend to enrich at the surface in contact with mould wall, while this enrichment of dispersant has little effect on mechanical performance of RBSC products; 3. Sharp edges on surface of raw particles could result to friction among particles, which afford strength to green bodies but prevent particles packing more closely.

Spheroid Growth during Sintering of Copper Coated Silicon Carbide Particles in the Fabrication of Nanocomposite

2007 ◽  
Vol 280-283 ◽  
pp. 1275-1278 ◽  
Author(s):  
Rui Zhang ◽  
Hai Long Wang ◽  
Lian Gao ◽  
Shao Kang Guan ◽  
Jing Kun Guo
Keyword(s):  
Silicon Carbide ◽  
Grain Growth ◽  
Nitrogen Atmosphere ◽  
Composite Particles ◽  
Shell Formation ◽  
Densification Process ◽  
Sic Particles ◽  
Spheroid Growth ◽  
Silicon Carbide Particles ◽  
Carbide Particles

Copper coated silicon carbide clusters were used to fabricate nanocomposite. Compacts were isostatically pressed and heated in nitrogen atmosphere. Microstructure observations were carried out to show the spheroid growth of the coated clusters. Spheroid growth was found to proceed through coalescence of smaller spheroids of the coated Cu/SiC composite particles. The densification process contains steps of agglomeration – kernel-shell formation – slumping movement. Grain growth of the adherent Cu particles is suppressed due to the constraint of rigid SiC particles. This is the deterministic characteristic of the coated composite particles.

Wettability of Silicon Carbide Particles by the Aluminium Melts in Producing Al-SiC Composites

2015 ◽  
Vol 1128 ◽  
pp. 149-155 ◽  
Author(s):  
Muna Noori ◽  
Mihai Chisamera ◽  
Hazim Faleh ◽  
Florin Ştefănescu ◽  
Gigel Neagu
Keyword(s):  
Silicon Carbide ◽  
Thin Layer ◽  
Surface Temperature ◽  
Active Elements ◽  
The Matrix ◽  
Surface Active ◽  
Sic Composites ◽  
Silicon Carbide Particles ◽  
Carbide Particles ◽  
Existing Data

The paper is a synthesis of essential data regarding the wetting conditions in aluminium – silicon carbide mixtures. Non wetting conditions between the reinforcing element and the matrix turns difficult the incorporation of particles in the aluminium melt. The wettability depends on several elements, like the presence of the oxide layer at the melt surface, temperature, pressure or shape of the complementary material. To improve wetting conditions, several measures are necessary: alloying of the melt with surface active elements, overheating of the melt; coating of the particles with a metallic thin layer. Also, by using existing data reported in the field, some parameters were calculated and interpreted.

Effect of Heat Treatment Process on the Hardness of Aluminium356/Silicon Carbide Particulate Composites

2020 ◽  
Vol 975 ◽  
pp. 176-181
Author(s):  
Satawat Salyajivin ◽  
Sukangkana Talangkun
Keyword(s):  
Silicon Carbide ◽  
Solution Treatment ◽  
Age Hardening ◽  
Particulate Composites ◽  
Average Hardness ◽  
Semi Solid ◽  
Sic Composites ◽  
Silicon Carbide Particles ◽  
Silicon Carbide Particulate ◽  
Carbide Particles

This research is aimed to study effect of holding time and temperature in solution treatment and ageing on the hardness of the Aluminum A356 reinforced with silicon carbide particles. Alumimium matrix coposite was particulated with 15 microns-SiC with the content of 15 percent by weight. A356/SiC composites was prepared by the stirr casting. The stirrer was continuously stired at a speed of 300 rpm during acooling temperature to semi-solid state of 610 °C. During stirring the SiC powder was slowly added into the melt and continuously stirred for another 10 min. Then poured into the mold at the pouring temperature of 680°C. A356/SiC composites then subjected to a solid solution treatment with temperature of 540 °C for 1 hr. quenched with water and age hardening temperature of 120 and 135 °C for 3, 6, 12 and 18 hr. The result showed that, in as cast conditions, the composite with 15 microns silicon carbide, the 15 wt%SiC specimen exhibited the average hardness of 64.33 HB. After solution treated, the hardness of samples decreased. the specimen exhibited the average hardness of 53.83 HB. After ageing, the hardness of samples increased. the specimen ageing 120 °C 6 hr. exhibited the lowest average hardness of 51.45 HB while the specimen ageing 135 °C 18 hr. exhibited the highest average hardness of 73.54 HB.

The Effect of SiC Surface Treatment on the Interface Bonding Behavior of SiC/Cu Composite Particles

2012 ◽  
Vol 512-515 ◽  
pp. 951-954
Author(s):  
Bing Bing Fan ◽  
Huan Huan Guo ◽  
Jian Li ◽  
Hai Long Wang ◽  
Ke Bao ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Surface Treatment ◽  
Practical Importance ◽  
Functional Materials ◽  
Decomposition Reaction ◽  
Reduction Reaction ◽  
Temperature Oxidation ◽  
Reaction Method ◽  
Silicon Carbide Particles ◽  
Carbide Particles

The SiC/Cu composite is one of the "structural-functional" materials. It shows good mechanical properties and very high thermal, high electrical conductivity etc. But the co-dispersion, wetting and bonding between SiC and Cu interface are of practical importance in the preparation of SiC/Cu composites. In this work, surface treatment techniques such as high-temperature oxidation, acid dipping and alkaline wash were adopted separately on silicon carbide particles, in order to improve the wettability and physical and chemical compatibility between silicon carbide and copper, then we used the replacement reaction method and decomposition-reduction reaction method to generate Cu coating on the surface of silicon carbide. The results shown that, the surface of silicon carbide particle which treated by alkaline wash was cleaner and more rough than that only treated by high-temperture oxidation, moreover, the specific surface of the particle was increased, which resulted in a compact layer of Cu coating. for the same silicon carbide particles, the effect of the Cu coating prepared by decomposition reaction method was better than that by reduction reaction method.

High Pressure Sintering of Silicon Carbide with Mg-Cr3C2 Composite Additive

2021 ◽  
Vol 1035 ◽  
pp. 768-772
Author(s):  
Jing Kun Li ◽  
Xue Ping Ren ◽  
Qiang Yan ◽  
Yan Ling Zhang ◽  
Hong Liang Hou
Keyword(s):  
Silicon Carbide ◽  
High Pressure ◽  
Magnesium Alloy ◽  
Chromium Carbide ◽  
Sintered Ceramic ◽  
High Pressure Sintering ◽  
C 30 ◽  
Silicon Carbide Particles ◽  
New Phase ◽  
Carbide Particles

Porous silicon carbide was sintered at 1300 °C/30 MPa for 2 h with 4 wt.% magnesium alloy and 4 wt.% chromium carbide composite additives. The sintered ceramic presented density of around 92% of the theoretical density. No new phase was observed after sintering. Mg segregates around chromium carbide particles in sintered ceramic. The silicon carbide particles were mainly bonded by melt magnesium alloy and chromium carbide diffused in solid state. The voids existed in the sintered ceramic, but much more fracture occurred in silicon carbide particles during bending due to high bonding strength of sintering necks. Some voids existed in the ceramic, which act as crack sources during fracture.

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