scholarly journals Fabrication of surface nano composites of Al/B4C at selected regions by Friction stir processing

2019 ◽  
Vol 4 (1) ◽  
pp. 7-15
Author(s):  
N Yuvaraj
Keyword(s):  
Process Parameters ◽  
Friction Stir Processing ◽  
Wear Behavior ◽  
Composite Layer ◽  
Traverse Speed ◽  
Nano Composite ◽  
Composite Surface ◽  
Friction Stir ◽  
Shoulder Diameter ◽  
The Relationship

Friction stir Processing is an important surface modifying technique to produce composite surface layer. This paper evaluates the effect of tool rotational speed, traverse speed and shoulder diameter on hardness and wear behavior of Al-B4C surface nano composite produced by FSP method. A Five level rotatable central composite design is used to predict the optimum input process parameters to fabricate the sound composite layer. Response surface methodology (RSM) Technique was used for analyzing the relationship between responses and process parameters. The results revealed that the shoulder diameter has more influence on achieving maximum hardness and wear resistance. To study the wear mechanisms, the selected wear worn out samples are analyzed through SEM studies

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.

Direct Extrusion of Circular Profiles with Surface Composite Produced by Friction Stir Processing

2011 ◽  
Vol 383-390 ◽  
pp. 2747-2752
Author(s):  
Arash Aghagol ◽  
Saeed Mahmoodi Darani ◽  
Karen Abrinia ◽  
Mohammad Kazem Besharati Givi
Keyword(s):  
Base Metal ◽  
Friction Stir Processing ◽  
Composite Layer ◽  
Traverse Speed ◽  
Extrusion Ratio ◽  
Friction Stir ◽  
Surface Composite ◽  
Direct Extrusion ◽  
Shoulder Diameter ◽  
Before And After

In this research, a new application of friction stir processing (FSP) in producing surface composite on circular billets was introduced. Al/Cu composite was fabricated by FSP on the surface of a 1050 aluminium cylinder with the diameter of 60 mm. Then this cylinder with surface composite was extruded with the extrusion ratio of 1.7. Finally, microstructure and microhardness were investigated before and after the extrusion. H13 hot work steel was used as the material of the tool whose pin diameter and length were 6 mm and shoulder diameter was 18 mm. The rotation and traverse speed of the tool were 1000 rpm and 25 mm/min respectively. The microstructural investigations show that the thickness of the composite layer decreases and a uniform layer of the composite remains on the surface after the extrusion. Also the microhardness measurements demonstrated that the hardness of the composite layer was higher than the base metal and the microhardness of all zones increased after the extrusion.

Influence of Process Parameters on Microstructure of Friction Stir Processed Mg AZ31 Alloy

2017 ◽  
pp. 1293-1305
Author(s):  
G. Venkateswarlu ◽  
M.J. Davidson ◽  
G.R.N. Tagore ◽  
P. Sammaiah
Keyword(s):  
Plastic Deformation ◽  
Grain Refinement ◽  
Process Parameters ◽  
Tilt Angle ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Traverse Speed ◽  
Homogeneous Microstructure ◽  
Friction Stir ◽  
Tool Tilt Angle

Friction stir processing (FSP) has been developed on the principles of friction stir welding (FSW) as an effective and efficien new method for grain refinement and microstructural modification, providing intense plastic deformation as well as higher strain rates than other conventional severe plastic deformation methods. FSP produces an equiaxed homogeneous microstructure consisting of fine grains, resulting in the enhancement of the properties of the material at room temperature. The objective of the present paper is to examine the influence of friction stir processing (FSP) parameters namely tool rotational speed (RS), tool traverse speed (TS) and tool tilt angle (TA) on the microstructures of friction stir processed AZ31B-O magnesium alloy. This investigation has focused on the microstructural changes occurred in the dynamically recrystallised nugget zone/ stir zone and the thermo mechanically affected zone during FSP. The results presented in this work indicate that all the three FSP process parameters have a significant effect on the resulting microstructure and also found that the rotational speed has greatly influenced the homogenization of the material. The grain refinement is higher at intermediate rotational speed (1150 rpm), traverse speed (32 mm / min and tilt angle (10). It is established that FSP can be a good grain refinement method for improving the properties of the material.

scholarly journals Formations of AZ91/Al2O3 nano-composite layer by friction stir processing

2016 ◽  
Vol 4 (4) ◽  
pp. 314-318 ◽  
Author(s):  
D. Ahmadkhaniha ◽  
M. Heydarzadeh Sohi ◽  
A. Salehi ◽  
R. Tahavvori
Keyword(s):  
Friction Stir Processing ◽  
Composite Layer ◽  
Nano Composite ◽  
Friction Stir

Influence of Process Parameters on Microstructure of Friction Stir Processed Mg AZ31 Alloy

2014 ◽  
Vol 2 (1) ◽  
pp. 47-58
Author(s):  
G. Venkateswarlu ◽  
M.J. Davidson ◽  
G.R.N. Tagore ◽  
P. Sammaiah
Keyword(s):  
Plastic Deformation ◽  
Grain Refinement ◽  
Process Parameters ◽  
Tilt Angle ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Traverse Speed ◽  
Homogeneous Microstructure ◽  
Influence Of Process Parameters ◽  
Friction Stir

Friction stir processing (FSP) has been developed on the principles of friction stir welding (FSW) as an effective and efficien new method for grain refinement and microstructural modification, providing intense plastic deformation as well as higher strain rates than other conventional severe plastic deformation methods. FSP produces an equiaxed homogeneous microstructure consisting of fine grains, resulting in the enhancement of the properties of the material at room temperature. The objective of the present paper is to examine the influence of friction stir processing (FSP) parameters namely tool rotational speed (RS), tool traverse speed (TS) and tool tilt angle (TA) on the microstructures of friction stir processed AZ31B-O magnesium alloy. This investigation has focused on the microstructural changes occurred in the dynamically recrystallised nugget zone/ stir zone and the thermo mechanically affected zone during FSP. The results presented in this work indicate that all the three FSP process parameters have a significant effect on the resulting microstructure and also found that the rotational speed has greatly influenced the homogenization of the material. The grain refinement is higher at intermediate rotational speed (1150 rpm), traverse speed (32 mm / min and tilt angle (10). It is established that FSP can be a good grain refinement method for improving the properties of the material.

Fabrication of Nano-Composite Surface Layers on Aluminium Employing Friction Stir Processing Technique

2010 ◽  
Author(s):  
S. F. K. Bozorg ◽  
A. S. Zarghani ◽  
A. Zarei-Hanzaki ◽  
Mohamad Rusop ◽  
Rihanum Yahaya Subban ◽  
...  
Keyword(s):  
Friction Stir Processing ◽  
Processing Technique ◽  
Surface Layers ◽  
Nano Composite ◽  
Composite Surface ◽  
Friction Stir

The Microstructure and Mechanical Properties of Al/Al2O3 Surface Composite Layer Produced by FSP Green Technique

2015 ◽  
Vol 819 ◽  
pp. 91-96 ◽  
Author(s):  
Kahtan S. Mohammed ◽  
Hasan I. Dawood ◽  
M. Darus Daud
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Surface Layer ◽  
Alumina Particle ◽  
Composite Layer ◽  
Traverse Speed ◽  
Alumina Powder ◽  
Strengthening Effect ◽  
Composite Surface ◽  
Friction Stir

In this study, alumina powder of two particle sizes, 1.0 and 3.0 μm were dispersed into the surface layer of pure commercial aluminum sheets by Friction Stir Processing technique (FSP) to produce a composite surface layer of Al/Al2O3. The processing parameters such as traverse speed and applied load were kept constant throughout the whole process at 45 mm/min and 10 kN respectively. Samples were subjected to various numbers of FSP passes from 1 to 3. The effect of tool rotation speed, alumina particle size and the number of the FSP passes on material flow were investigated. Mechanical properties evaluation of the surface layer revealed that hardness and strength are a result of the interactions of FSP passes and tool rotational speed. The increments in hardness of the surface layer showed big variation between samples of small alumina particle size and that of larger alumina particle size. Finer particles gave better hardness and strengthening effect than the coarse particles did. Microstructural observations were carried out using optical and scanning electron microscopy (SEM) on samples’ cross sections perpendicular to the tool traverse direction.

Estimation of mechanical properties of friction stir processed Al 6061/Al2O3-Tib2 hybrid metal matrix composite layer via artificial neural network and response surface methodology

2021 ◽  
pp. 146442072110345
Author(s):  
Vahid M Khojastehnezhad ◽  
Hamed H Pourasl ◽  
Arian Bahrami
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Process Parameters ◽  
Friction Stir Processing ◽  
Wear Behavior ◽  
Friction Stir ◽  
Al 6061 ◽  
Artificial Neural

Friction stir processing is one of the solid-state processes which can be used to modify the structure and properties of alloys. In addition, it has become one of the most promising techniques for the preparation of the surface layer composites. To pursue cost savings and a time-efficient design, the mathematical model and optimization of the process can represent a valid choice for engineers. Friction stir processing was employed to generate an Al 6061/Al2O3-TiB2 hybrid composite layer, and mechanical properties such as the hardness and wear behavior were also measured. The relationship between the hardness and wear behavior, process parameters of friction stir processing were evaluated using an artificial neural network and response surface methodology. The rotational speed (1500–1800 rpm), traverse speeds (25, 50, 100 mm/min), and the number of passes (1–4) with constant axial force (2.61 kN) were used as the input, while the hardness and weight loss values were the output. Experimentally, the results showed that the process parameters have significant effect on hardness and wear behavior of Al 6061/Al2O3-TiB2. In addition, the developed artificial neural network and response surface methodology models can be employed as alternative methods to compute the hardness and weight loss for given process parameters. The results of both models showed that the estimated values for the hardness and wear behavior of the processed zone had an error less than 0.60%, which indicated reliability, and an evaluation of the estimated values of both models and the experimental values confirmed that the artificial neural network is a better model than response surface methodology.

Optimization of Corrosion Behavior in Submerged Friction Stir Processed Magnesium AZ31B Alloy

2017 ◽  
Author(s):  
Sankar Ramaiyan ◽  
Udayakumar Mani ◽  
Rathinasuriyan Chandran ◽  
Senthil Kumar Velukkudi Santhanam
Keyword(s):  
Corrosion Rate ◽  
Process Parameters ◽  
Friction Stir Processing ◽  
Optimization Technique ◽  
Traverse Speed ◽  
Immersion Test ◽  
Friction Stir ◽  
Response Optimization ◽  
Az31b Alloy ◽  
Tool Pin

In this research, friction stir processing of AZ31B magnesium alloy of 6 mm thickness was done in submerged conditions. The process parameters, i.e. tool pin profile (simple cylindrical, stepped cylindrical, stepped square), rotational speed ranging from 800 to 1200 rpm and traverse speed ranging from 0.5 to 1.5 mm/sec were optimized using the multi response optimization technique. The experiment was conducted with L27 orthogonal arrays. The Immersion test and hardness have been considered as output response. From the view of an application, it would be more significant to optimize the Immersion Corrosion rate and Hardness of Submerged Friction Stir Processed AZ31B alloy. Thus, this study aims at optimizing the process parameters, including various tool pin profiles, feed rates and rotational speeds with corrosion rate and micro hardness using TOPSIS. Using analysis of variance (ANOVA), the most significant parameter effect of the submerged friction stir processing was determined.

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