FABRICATION OF Mg/SiC NANOCOMPOSITE SURFACE LAYER USING FRICTION STIR PROCESSING TECHNIQUE

2011 ◽  
Vol 10 (04n05) ◽  
pp. 1073-1076 ◽  
Author(s):  
YOONES ERFAN ◽  
SEYED FARSHID KASHANI-BOZORG
Keyword(s):  
Uniform Distribution ◽  
Friction Stir Processing ◽  
Composite Layer ◽  
Processing Technique ◽  
Speed Ratio ◽  
Friction Stir ◽  
Sic Particles ◽  
The Matrix ◽  
Tool Rotation

Friction stir processing (FSP) was employed to incorporate nano-sized SiC particles into the surface of AZ31 magnesium substrate in order to produce surface nanocomposite layers. Characterization of the microstructure of the processed layers exhibited powders agglomeration which was found to disperse with increasing the tool rotation speed/advancing speed ratio. A uniform distribution of SiC particles with a mean particle size of ~95 nm was achieved after second FSP passes. The matrix grain size was found to decrease by increasing the tool advancing speed and number of FSP passes; however, increasing the advancing speed resulted in introduction of defects which leads to tunnels. The micro hardness value of the composite layer with uniform distribution of nano-size SiC particles was found to be almost twice of that of the AZ31 substrate.

PRODUCING NANOCOMPOSITE LAYER ON THE SURFACE OF AS-CAST AZ91 MAGNESIUM ALLOY BY FRICTION STIR PROCESSING

2012 ◽  
Vol 05 ◽  
pp. 375-382
Author(s):  
P. ASADI ◽  
M. K. BESHARATI GIVI ◽  
G. FARAJI
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Friction Stir Processing ◽  
Composite Layer ◽  
Az91 Magnesium Alloy ◽  
Friction Stir ◽  
Nanocomposite Layer ◽  
Sic Particles ◽  
Developed Surface ◽  
Mechanical And Microstructural Properties

Friction stir processing (FSP) is an effective tool to produce a surface composite layer with enhanced mechanical properties and modified microstructure of as-cast and sheet metals. In the present work, the mechanical and microstructural properties of as-cast AZ 91 magnesium alloy were enhanced by FSP and an AZ 91/ SiC surface nanocomposite layer has been produced using 30 nm SiC particles. Effect of the FSP pass number on the microstructure, grain size, microhardness, and powder distributing pattern of the surface developed has been investigated. The developed surface nanocomposite layer presents a higher hardness, an ultra fine grain size and a better homogeneity. Results show that, increasing the number of FSP passes enhances distribution of nano-sized SiC particles in the AZ 91 matrix, decreases the grain size, and increases the hardness significantly. Also, changing of the tool rotating direction results much uniform distribution of the SiC particles, finer grains, and a little higher hardness.

scholarly journals Characterization of Microstructural Refinement and Hardness Profile Resulting from Friction Stir Processing of 6061-T6 Aluminum Alloy Extrusions

Metals ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 552 ◽  
Author(s):  
Nelson Netto ◽  
Murat Tiryakioğlu ◽  
Paul Eason
Keyword(s):  
Friction Stir Processing ◽  
Base Material ◽  
Hardness Profile ◽  
Size Distributions ◽  
Coarse Particles ◽  
Microstructural Refinement ◽  
Friction Stir ◽  
The Matrix ◽  
Single Size

In this study, the change in microstructure and microhardness adjacent to the tool during the friction stir processing (FSP) of 6061-T6 extrusions was investigated. Results showed that the as-received extrusions contained Fe-rich constituent particles with two distinct size distributions: coarse particles in bands and finer particles in the matrix. After FSP, Fe-containing particles exhibited single-size distribution and the coarse particles appeared to be completely eliminated through refinement. Microhardness tests showed the presence of four distinct zones and that hardness increased progressively from the dynamically recrystallized closest to the tool, outward through two distinct zones to the base material. The similarities and differences between the results of this study and others in the literature are discussed in detail.

FABRICATION OF TI/SIC SURFACE NANO-COMPOSITE LAYER BY FRICTION STIR PROCESSING

2012 ◽  
Vol 05 ◽  
pp. 367-374 ◽  
Author(s):  
ALI SHAMSIPUR ◽  
SEYED FARSHID KASHANI-BOZORG ◽  
ABBAS ZAREIE-HANZAKI
Keyword(s):  
Friction Stir Processing ◽  
Composite Layer ◽  
Pure Titanium ◽  
Titanium Substrate ◽  
Commercially Pure Titanium ◽  
Nano Composite ◽  
Composite Surface ◽  
Friction Stir ◽  
Commercially Pure ◽  
Sic Particles

In the present investigation, novel Ti / SiC surface nano-composite layer was successfully fabricated by dispersing nano-sized SiC particles into commercially pure titanium plates employing friction stir processing technique. The process parameters such as tool rotation and advancing speeds were adjusted to produce defect-free surface composite layer, however, uniform distribution of the nano-size SiC particles in a matrix of titanium was achieved after the second pass. The micro hardness value of the Ti / SiC nano-composite surface layer was found to be ~534 HV; this is 3.3 times higher than that of the commercially pure titanium substrate. No reaction was detected between SiC powders and the titanium matrix after friction stir processing.

FABRICATION OF SURFACE COMPOSITE BY FRICTION STIR PROCESSING USING A NOVEL DIRECT PARTICLE INJECTION TOOL

2019 ◽  
Vol 26 (04) ◽  
pp. 1850182
Author(s):  
P. MUTHUKUMAR ◽  
S. JEROME ◽  
R. JOHN FELIX KUMAR ◽  
S. PRAKASH
Keyword(s):  
Friction Stir Processing ◽  
Composite Layer ◽  
Aluminum Matrix ◽  
Homogeneous Distribution ◽  
Particle Injection ◽  
Friction Stir ◽  
Surface Composite ◽  
Surface Composite Layer ◽  
The Matrix ◽  
The Impact

In this work, aluminum/titanium carbide (Al/TiC) surface composite has been fabricated by friction stir processing using a novel modular Direct Particle Injection Tool (DPI–FSP). The tool has a unique feature wherein the TiC particles have been transferred from the tool itself by spring adjusted plunger movement into the matrix. The microstructural observations from optical and scanning electron microscope (SEM)-EDS results revealed the homogeneous distribution of particles in the stirred zone (SZ) and the thickness of the formed surface composite layer (SCL) is approximately 0.34[Formula: see text]mm. X-ray diffraction results confirmed that the particles are reinforced in the aluminum matrix, and no intermetallics have been formed in the composite. The microhardness of composite was increased from 68 to 135[Formula: see text]Hv, and the impact test results showed that the toughness was almost comparable to that of the base metal.

scholarly journals Effects of Multi-Pass Friction Stir Processing on Microstructures and Mechanical Properties of the 1060Al/Q235 Composite Plate

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 298 ◽  
Author(s):  
Jian Wang ◽  
Yun Cheng ◽  
Bo Li ◽  
Cheng Chen
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Processing ◽  
Composite Plate ◽  
Rotation Speed ◽  
Composite Plates ◽  
Bending Properties ◽  
Friction Stir ◽  
Stirring Effect ◽  
The Matrix ◽  
Tool Rotation

Steel cuttings, holes and cracks always exist at the interfaces in the composite plate. Multi-pass friction stir processing (M-FSP) is proposed in this research to optimize the interface microstructure and the interface connection for the 1060Al/Q235 composite plate. Results show that the microstructures of 1060Al after M-FSP are fine and uniform owing to the strong stirring effect and recrystallization. Micro-defects formed by the welding can be repaired by the M-FSP. However, tunnel defects can also be formed in the matrix of aluminum by M-FSP, especially when the passes are one and two. The melting block and the melting lump in the composite plates are easy to become the source of crack. The shear strengths and the bending properties for the 1060Al/Q235 composite plate after M-FSP are the best when the passes are three, with the tool rotation speed of 1200 rpm and the forward speed of 60 mm/min. The optimized interfaces for the composite plate after M-FSP are mainly by the metallurgical bondings, with a certain thickness and discontinuous mechanical connections. Therefore, the crack extension stress is the largest and the mechanical properties are the best.

Effect of Ceramic Particles on Microstructure and Mechanical Properties of Aluminium Surface Composite Fabricated Using Friction Stir Processing

2015 ◽  
Vol 830-831 ◽  
pp. 440-443 ◽  
Author(s):  
A. Thangarasu ◽  
N. Murugan
Keyword(s):  
Friction Stir Processing ◽  
Processing Speed ◽  
Composite Layer ◽  
Homogeneous Distribution ◽  
Tool Rotational Speed ◽  
Friction Stir ◽  
Surface Composite ◽  
Surface Composites ◽  
Sic Particles ◽  
Surface Composite Layer

Friction stir processing (FSP) is a novel technique used to fabricate surface composites. This investigation is an attempt to made Al/Al2O3 and Al/SiC surface composite using FSP and compare the mechanical and metallurgical properties influenced by the types of reinforcement particles. Two plates were grooved with 0.8 mm in width, 5 mm in depth and 100 mm in length in the middle of the aluminium plate using wire EDM and compacted with Al2O3 and SiC powder. The FSP was carried out automatically on an indigenously built FSW machine at tool rotational speed of 1200 rpm, processing speed of 60 mm/min and axial force of 10 kN. The optical and Scanning Electron microstructures are precisely revealed the homogeneous distribution of Al2O3 and SiC particles in the stir zone of surface composite layer (SCL). The microhardness was measured across the cross section of SCL layers of Aluminium and Aluminium with SiC and Al2O3. The higher microhardness was obtained in Aluminium with SiC and Al2O3 composites fabricated by FSP. This is because of the higher hardness value of SiC particles than Al2O3 particles.

Fabrication of Al6061-AMC by Adding Copper-Coated SiC Reinforcement by Friction Stir Processing (FSP)

2014 ◽  
Vol 783-786 ◽  
pp. 1721-1728 ◽  
Author(s):  
Jong Ning Aoh ◽  
Chih Wei Huang ◽  
Wei Ju Cheng
Keyword(s):  
Electroless Plating ◽  
Friction Stir Processing ◽  
Aluminum Matrix ◽  
Copper Film ◽  
Aluminum Matrix Composite ◽  
Double Pass ◽  
Friction Stir ◽  
Sic Particles ◽  
The Matrix ◽  
Particulate Reinforced

Friction stir processing (FSP) has successfully evolved as a technique in fabricating surface composite. An alternative technique on fabrication of a SiC-reinforced Al6061 aluminum matrix composite (AMC) by stirring copper-coated SiC particles into matrix to form a reinforced zone was developed. Copper film was deposited onto the SiC particles by electroless plating and by photodeposition processes. The copper coating serves as an adhesion and diffusion layer to enhance the cohesion between the particles and the matrix. It is to expect that the strength of the AMC could be improved. The uniformity of particle distribution in the stir zone (SZ) was improved by adjusting the location of particle insert and by a double-pass stir. T5 post weld heat treatment (PWHT) was conducted to retrieve the hardness and the strength of the SZ to the strength level of the matrix. While the submicron-thick Cu-coating was partially separated from SiC particles after FSP, photodeposition Cu-coating less than 100 nm thick exhibited a better adhesion to the SiC particles. The EPMA analysis across the interface shows evidence of interdiffusion between copper and aluminum which implies an enhanced cohesion between the particles and matrix. After PWHT, while the SZ containing photodeposition Cu-coated SiC exhibited the highest hardness among different SZs, the SZ containing electroless Cu-coated SiC exhibited the highest strength. The possible mechanisms for the improvement of the hardness and strength were discussed. In summary, the purpose of fabricating a locally particulate-reinforced Al6061 AMC by stirring Cu-coated SiC particles into Al6061 matrix was achieved. Keywords:Friction stir processing (FSP), particulate reinforced AMC, electroless plating, photodeposition, copper-coated SiC particles

scholarly journals Machining Characteristics, Tribological and Corrosion Behaviour of AA7075 Hybrid Composites

2020 ◽  
Vol 9 (5) ◽  
pp. 566-571
Keyword(s):  
Friction Stir Processing ◽  
Hybrid Composite ◽  
Hybrid Composites ◽  
Corrosion Behaviour ◽  
Processing Technique ◽  
Ceramic Phase ◽  
Friction Stir ◽  
The Matrix ◽  
Aluminum Alloy 7075 ◽  
Machining Characteristics

In this paper an attempt has been made to review machining characteristics, tribological and corrosion behaviour of aluminum alloy 7075 hybrid composite utilizing different types of reinforcements. Many investigations revealed that application of various new techniques like friction stir processing, electric discharge machining and abrasive water jet machining are found to be the successful for enhancing the machining characteristics of hybrid composite. It was found in many researches that the introduction of hard ceramic phase with soft reinforcement phase into the matrix improves the tribological characteristics along with other mechanical properties. The corrosion rate was found to be higher for the composite with poor interface between matrix and reinforcement. Also, many researchers reported about the enhancement of corrosion resistance due to heat treatment, employing friction stir processing technique and optimized addition of reinforcement.

Microstructural Evolution of Body-Centred Cubic Fe-Al Alloy by Friction Stir Processing with SiC Particles Addition

2016 ◽  
Vol 838-839 ◽  
pp. 326-331 ◽  
Author(s):  
Toru Nagaoka ◽  
Yoshihisa Kimoto ◽  
Hiroyuki Watanabe ◽  
Masao Fukusumi ◽  
Yoshiaki Morisada ◽  
...  
Keyword(s):  
Friction Stir Processing ◽  
Ferrite Matrix ◽  
Stir Zone ◽  
Al Alloy ◽  
Alloy Plate ◽  
Friction Stir ◽  
Dispersed Particles ◽  
Sic Particles ◽  
Average Grain Size ◽  
The Matrix

The surface of body-centred cubic Fe-7Al (mass%) alloy plate was successfully modified by friction stir processing with SiC particles addition. The stir zone with SiC addition had an average grain size of 5.9 μm, smaller than that of 10.1 μm in the stir zone without SiC addition. SiC particles introduced by friction stir processing were converted to fine Fe3AlCx particles by reaction with the ferrite matrix. The hardness near the surface of the stir zone was significantly increased to 351 HV by introduction of particles, compared to the hardness of 200 HV in the stir zone without particles addition. The dispersed particles also contributed to suppression of grain growth of the matrix at elevated temperature.

Fabrication and Characterization of CU/B4C Surface Dispersion Strengthened Composite using Friction Stir Processing

2014 ◽  
Vol 59 (1) ◽  
pp. 83-87 ◽  
Author(s):  
R. Sathiskumar ◽  
N. Murugan ◽  
I. Dinaharan ◽  
S.J. Vijay
Keyword(s):  
Friction Stir Processing ◽  
Matrix Material ◽  
Composite Layer ◽  
Copper Surface ◽  
Chromium Steel ◽  
Copper Plate ◽  
Homogeneous Distribution ◽  
Scanning Electron Micrographs ◽  
Friction Stir ◽  
The Matrix

Abstract Friction stir processing has evolved as a novel method to fabricate surface metal matrix composites. The feasibility to make B4C particulate reinforced copper surface matrix composite is detailed in this paper. The B4C powders were compacted into a groove of width 0.5 mm and depth 5 mm on a 9.5 mm thick copper plate. A tool made of high carbon high chromium steel; oil hardened to 63 HRC, having cylindrical profile was used in this study. A single pass friction stir processing was carried out using a tool rotational speed of 1500 rpm, processing speed of 40 mm/min and axial force of 10 kN. A defect free interface between the matrix and the composite layer was achieved. The optical and scanning electron micrographs revealed a homogeneous distribution of B4C particles which were well bonded with the matrix. The hardness of the friction stir processed zone increased by 26% higher to that of the matrix material.

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