Apr, 2015 friction stir processing from the table, it is clear that friction stir processing effective method to improves the mechanical properties of cast al and mg alloys material condition ys mpa uts mpa e % a356 ascast asfsp 2 140 169 238 3 38 az91 ascast asfsp 75 140 101 248 2. Friction stir processing, magnesium alloys, severe plastic deformation, grain size refinement, az91, az61. Spatial variations of microstructure, hardness, chemical composition, tensile behavior, texture, and residual stresses were investigated in a friction stir processed fsp az31b magnesium alloy. Mishra, sumit jain department of mechanical, production. Friction stir welding and processing vi joining welding. A new microstructural modifications technique was developed by the welding institute twi of united kingdom in 1991 is known as friction stir processing fsp.
With the cooling enhancement during processing, the grain size is significantly refined to be 3. Full length article synthesize of az31tic magnesium matrix composites using friction stir processing m. In the past, friction stir processing has been used to process azseries magnesium alloys and a few recontaining magnesium alloy ma, 2008. Thermal history of the two fsp procedures is measured, and its effect on microstructures and mechanical properties of the experimental materials is. Friction stir processing fsp is a novel solid state technique to synthesize metal matrix composites. Previous works have been primarily focused on the processing. Friction stir processing from the table, it is clear that friction stir processing effective method to improves the mechanical properties of cast al and mg alloys material condition ys mpa uts mpa e % a356 ascast asfsp 2 140 169 238 3 38 az91 ascast asfsp 75 140 101 248 2. The effect of friction stir processing on microstructure and tensile. Effects of friction stir processing on mechanical properties and damping capacities of az31 magnesium alloys. The residual stresses were measured using two different methods. The microstructure, hardness and friction and wear. Enhanced mechanical properties of mgalzn cast alloy via.
Grain refinement and high temperature deformation in two kinds of magnesium alloys subjected to friction stir processing fsp have been investigated. Friction stir welding and processing vi wiley online books. Friction stir processing of am60b magnesium alloy sheets. Friction stir welding trials of four magnesium alloys three cast am50, am60 and az91. Friction stir processing in aluminum alloys, specifically to. Friction stir processing of magnesium alloy with spiral. Application of friction stir method for welding of magnesium. Pdf friction stir processing of the az91 magnesium alloy with sic. The fsw process has not yet been fully optimised for this application, and the joining of ti alloys by fsw remains a challenging undertaking.
Recently, friction stir processing particle reinforced magnesium has been studied 29,30,32,67,68,69,70. Friction stir welding of magnesium alloys march 2003 twi. Reference to this paper should be given in the following way. The control of the heat sink and sample temperature allows for fsp samples of good quality, enhancing the grain size refinement in the stirred zone down to values close to 0. Heat is generated by friction between the rotating tool and the workpiece material, which leads to a. In the present investigation, aa7075t6 alloys and az31bh24 were joined by the fsw process using the following range of parameters.
Fine and ultrafine grained az61 and az91 magnesium alloys. Friction stir welding fsw and friction stir processing fsp have been applied to various materials including plastics stainless steels 84,85, magnesium alloys, titanium alloys, pure copper, copperzinc alloys and metal matrix composite materials. Sections 7 and 8, respectively, pertain to work on lap and spot joints. Microstructure and mechanical properties of friction stir welded aa5454. It is a is a solidstate processing technique based on friction stir welding technique in which a specially designed rotating cylindrical tool that comprises of a probe. A technological process was developed for friction stir processing of surfaces of parts from magnesium and aluminum alloys for structure modification directed on formation of layer of finegrain alloy structure grain size 1. Friction stir welding fsw is a solidstate joining process that uses a nonconsumable tool to join two facing workpieces without melting the workpiece material. The authors describe the links between the thermomechanical aspects and the microstructural evolution and use of these for the development of the friction stir process as a broader metallurgical tool for microstructural modification and manufacturing. The authors describe the links between the thermomechanical aspects and the microstructural evolution and use of these for the development of the friction stir process as a broader metallurgical tool for microstructural modification and. One was a rolled sheet of la141mg and another was a cast plate of az91mg. Friction stir welding fsw, a highly efficient solidstate joining technique, has been termed as green technology due to its energy efficiency and environment friendliness. Friction stir welding has seen significant growth in both technology implementation and scientific exploration. Limited experience exists of the application of this technology to real components. Friction stir welding of az31b magnesium alloy with 6061.
Heat is generated by friction between the rotating tool and the workpiece material, which leads to a softened region near the fsw tool. Friction stir processing of aluminum casting alloys. Friction stir processing of particle reinforced composite. Influence of friction stir processing conditions on corrosion. Microstructure, texture, and residual stress in a friction stir processed az31b magnesium alloy w. Friction stir processing fsp, which has its basis on friction stir welding fsw, is another surface modification approach for refining the microstructure of metallic materials including magnesium since the beginning of this century. Ding a,b anational engineering research center of light alloy net forming, shanghai jiao tong university, 800 dongchuan road, shanghai 200240, pr china bthe state key. Fsw or fsp has many advantages such as elimination of the defects named crack and porosity. Friction stir welding fsw is a solid state welding process in which the rotary motion of a cylindrical tool along the welding line is the prime factor for the weld formation.
Barralliera amecasurf, arts et metiers paristech, 2 cours des arts et metiers, 617 aix en rovence, france bim2np, paul cezanne university, marseille, france received 20 may 2008. Center for friction stir processing, materials science and engineering, university of missouri, rolla, mo 65409, usa. Introduction friction stir processing is the process of carrying out intense plastic deformation for changing the properties of the material. The paper is entitled to see the factors affecting the magnesium alloy during friction stir processingfsp. Surface appearance, macrostructure, hardness and tensile properties were determined. Process mechanics in friction stir welding of magnesium. Friction stir processing fsp is a novel spd process proposed by mishra et al based on friction stir. Grain refinement and high temperature deformation in friction. Friction stir welding fsw is a simple, clean and innovative joining technology invented by the welding institute in the uk in 1991 7,8. Pdf friction stir processing of magnesium alloys used in.
Pdf friction stir welding fsw is considered to be the most significant development in metal joining in last two decades. He has many firsts in the field of friction stir welding and processing. Friction stir welding of az31 magnesium alloy rolled sheets. During this process the different thickness of the two sheets can cause an unequal heat distribution below the tool, affecting material flow and therefore components strength. By other means changing the confined characteristics of the material. A heat treatable sand cast we43 magnesium alloy was friction stir processed fsp. Review of friction stir processing of magnesium alloys. Friction stir processing fsp is one of the new and promising thermomechanical processing techniques that alters the microstructural and mechanical properties of the material in single pass to achieve maximum performance with low production cost in less time using a simple and inexpensive tool. Superplasticity of az31 magnesium alloy prepared by. Effects of friction stir processing on mechanical properties. Ductility improvement of an az61 magnesium alloy through two. Full length article microstructures and mechanical properties of friction stir processed mge2. The obtained tomography reconstructions visualize the distribution of titanium particles used as a marker in the friction stir welding process and cracks in magnesium alloys, which appeared during casting procedure.
Recently, friction stir processing fsp, a new solidstate processing technique, has been developed based on the basic principles of fsw 9. Aug 04, 2014 this book lays out the fundamentals of friction stir welding and processing and builds toward practical perspectives. Friction stir processing fsp is developed as a relatively novel metal working technique, based on the basic principle of friction stir welding fsw 9,10. Thus fsw is a suitable process for welding magnesium alloys 5.
Friction stir welding of titanium alloys is still an emerging technology, and the following limitations exist at this time. Phase analysis, microstructural characterization, potentiodynamic polarization test and immersion tests were carried out to relate the corrosion behavior to the samples. The simultaneous rotation and translation of the tool. Influence of friction stir processing conditions on. Friction stir welding of az31 magnesium alloy rolled. Friction stir processing, we43, cast magnesium, yttrium, grain size. Published under licence by iop publishing ltd iop conference series. In the present work, an attempt has been made to synthesize az31tic magnesium matrix composites using fspand to analyze the microstructure using scanning electron microscopy. The summary of magnesium alloys prepared through multipass friction stir processing mfsp, with an overlapping ratio of 100% with different. Multipass submerged friction stir processing msfsp with an overlapping ratio of 50% was applied on ascast az61 magnesium plate. Fine and ultrafine grained az61 and az91 magnesium.
Barralliera amecasurf, arts et metiers paristech, 2 cours des arts et metiers, 617 aix en rovence, france. Friction stir welding can be used for difficult to be welded magnesium alloys to manufacture magnesium twbs. Friction stir welding of dissimilar aa7075t6 to az31bh24. Friction stir processing of the az91 magnesium alloy with sic particles article pdf available in archives of materials science and engineering 772. Procedures giving sound welds for all combinations were developed. It also includes an update on the current research issues in the field of friction stir welding and a guide for further research. Investigate the potential of fsp to form a particlereinforced zone in standard al cast components, by mixing and creating strengthening particles, and establish optimum processing. Effect of thermal history on microstructures and mechanical.
In this investigation joining of dissimilar mg alloys, zm21to az31 plates was carri. Influence of processing parameters on microstructure and mechanical properties pages. Materials free fulltext effect of thermal history on. The relationship between the microstructure and tensile behavior of the msfsp plate was investigated. Recent advances in friction stir weldingprocessing of. Friction stir superplasticity for unitized structures. Microtomography study of magnesium friction stir welding. Microstructure manipulationsurface composite fabrication ning sun and diran apelian report no. Microstructure and mechanical properties of az31 magnesium alloys prepared by friction stir processing fsp. Kilbert semisolid production processing of magnesium alloys by. It can be observed that the highest friction coefficient and wear rate correspond to the base metal. Multipass submerged friction stir processing of az61. Sivaprakasam d a department of mechanical engineering, akshaya college of engineering and technology, coimbatore 642109, tamil nadu, india b department of mechanical engineering, v v college of engineering.
Magnesium mg alloys have been extensively used in various fields, such as aerospace, automobile, electronics, and biomedical industries, due to their high specific strength and stiffness, excellent vibration absorption, electromagnetic shielding effect, good machinability, and recyclability. Modeling of fracture toughness of magnesium alloy we43. This book covers all aspects of friction stir welding and processing, from fundamentals to design and applications. Microstructures and mechanical properties of friction stir. Clausen d a department of materials science and engineering, the university of tennessee, knoxville, tn 37996, usa b materials science and technology division, oak ridge national laboratory, oak ridge, tn 37831, usa. Base material rotation speed, rpm processing speed, mmmin grain size.
Kiral friction stir welding of az31 magnesium alloys a numerical and experimental study latin american journal of solids and structures 14 2017 1 1 introduction friction stir welding fsw, which has been. Magnesium based surface metal matrix composites by. The model results of the material before fsp matched well with the dic results, but the model of the material. Mechanical properties of ultrafine grained az91 magnesium. Synthesize of az31tic magnesium matrix composites using. Application of friction stir method for welding of. Friction stir processing fsp is a method of changing the properties of a metal through intense, localized plastic deformation 7. Materials science and engineering, volume 230, conference 1. Pdf friction stir processing of the magnesium alloy az61. Manipulate the microstructure to refine or strengthen locally 2. The effect of friction stir processing fsp on the microstructure and mechanical properties of a magnesium alloy az91 has been analyzed. Grain refinement and high temperature deformation in. The microstructure, hardness and friction and wear behavior.
This book lays out the fundamentals of friction stir welding and processing and builds toward practical perspectives. Friction stir processing fsp is a severe plastic deformation technique. Related content effect of friction stir processing on tribological properties of alsi alloys s m aktarer, d m sekban, h yanar et al. Friction stir welding, magnesium alloy, process parameter. The mechanical and microstructural properties of am60b magnesium alloy resulting from the friction stir processing fsp were analysed in the present study. Section 9 deals with the issue of generating joint allowables. Friction stir welding and processing viii wiley online books. Friction stir processing fsp is a severe plastic deformation technique, based on the principle of. Friction stir welding of titanium alloys a progress update. Using a computed microtomography system, friction stir welding samples and magnesium alloys samples were examined. Thixomolding mg ultrafine grain friction stir processing severe plastic. Section 6 pertains to work on butt joints of aluminum 6.
It is an enabling technology for joining metallic materials, in particular lightweight highstrength aluminum and magnesium alloys which were classified as unweldable. Modeling of fracture toughness of magnesium alloy we43 before. Pdf friction stir processing of the az91 magnesium alloy. To this end, the connection of magnesium alloys was performed using different welding parameters. Friction stir processing is a relatively new technique for microstructural modification to improve the mechanical properties of materials. Friction stir processing fsp was applied to incorporate 510 vol % nanoparticles into the matrix. The corrosion behavior of ascast az91c magnesium alloy was studied by performing friction stir processing fsp and fsp followed by solution annealing and then aging. Hence, joining magnesium alloys by means of solidstate processes appears to be the best solution to these problems. The factors included in this are affect of tool material.
F y lan 1, h m chen 2, w p guo, j zhang and y x jin. Friction stir processing of magnesium alloys used in automobile and aerospace applications r. The fsp is a newer technique used for refining and homogenizing the grain structure of. Fsp was developed by adapting the concepts of friction stir welding to obtain a fine grain size in a stirred zone. Friction stir processing fsp has attracted much interest as a tool for refining grain size and achieving high angle boundary misorientation in magnesium alloys.
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