The mechanical properties such as yield strength and ultimate tensile strength can be enhanced when aluminum aa 6351 alloy was processed by equal channel angular extrusion for single pass at route a at 303 k. Equal channel angular extrusion processing of alloys. Comparative study of the required force for performing equal. Lavanya textbook engineering metal engineering metal processing metal structure. Upper bound analysis of equal channel angular extrusion. Numerical estimation of frictional effects in equal. Ecae is one of the severe plastic deformation processes. Although strength and hardness of the aluminum tube are increased dramatically after the. Analysis of tool cavity stresses in channel angular extrusion.
Equal channel angular pressing ecap is an effective process to produce materials with increased mechanical properties and no change of billet size. Equal channel angular extrusion for development of. Three types of plasticine samples were used in experiments. Processing of polypropyleneorganic montmorillonite. The equal channel angular extrusion or pressing ecaeecap process has been developed over these last years in order to obtain nanostructured materials by means of severe plastic deformation. Oct 26, 2015 in the present work, an extrusion equal channel angular extrusion execae process composed of two processes, extrusion and ecae, is developed. Ecae is unique because significant cold work can be accomplished without reduction in the cross sectional area of the deformed workpeice. Hence, this investigation is aimed at gathering contributions on the influence of equal channel angular extrusion toward improving the mechanical properties of. A mechanism, which during the deformation is responsible for the formation of new and fine grains, is the mutually crossing of macroand. Texture evolution in commercially pure al during equal. Investigate equal channel angular extrusion ecae as a deformation processing technique to manipulate the microstructure and improve material properties such as strength, formability, fatigue, and corrosion. Tool design considerations for the ecae are discussed.
This paper describes a new modification of equalchannel angular extrusion for the. Submicrometergrained smg microstructures are produced in an almgsi alloy 6061 by subjecting peakaged and overaged billets of the alloy to intense plastic strain by a process known as equal channel angular extrusion. This article describes the mechanics and processing characteristics of equalchannel angular extrusion ecae. The channel angular extrusion cae technique is a process, in which a deformable solid material is led to yielding through the intersection of inclined c hannels. This paper presents a stateoftheart and a retrospective view of the critical stages in the evolution of equal channel angular extrusion ecae from the original idea. Equal channel angular extrusion, upperbound analysis, physical modeling. Microstructures and mechanical properties were discussed. The focus of this article is texture development in metals of fcc, bcc, and hcp crystal structure processed by a severe plastic deformation spd technique called equal channel angular extrusion ecae or equal channel angular pressing ecap. Processing of a duplex stainless steel by equal channel. A theoretical analysis of internal pressure and stresses developed at the interface with. We have conducted a series of equal channel angular extrusion experiments on an fe16n2 magnetic phase material containing 3 wt mn. Application of equal channel angular extrusion to semisolid. Design and fabrication of equal channel angular extrusion.
Pdf a new design for equal channel angular extrusion. Effect of equal channel angular extrusion on corrosion behavior of almn alloy by jutatip namahoot, a. Equalchannel angular eca pressing is the main technique of the severe plastic deformation spd method, applied for fabrication of bulk nanostructured metal materials. Equal channel angular extrusion ecae is one technique from the severe plastic deformation spd group, aimed at producing ultra fine grained ufg material. Important position among them holds the equal channel angular extrusion ecae 46. Effects of equal channel angular extrusion assisted by. Physical simulation was used to identify the deformation zone and as a background for the following theoretical ecae analysis by rigid block model. In this paper, several topics on ecae of materials for potential automotive applications are briefly addressed. Enhancement of mechanical properties of aa 6351 using equal. Development of a continuous equal channel angular extrusion ecae process. Grain refinement in beryllium by equal channel angular extrusion. Jan 01, 2003 ultrafinegrained be is the material of choice for fabrication of the nif target capsules.
Equal channel angular extrusion ecae is a kind of processing method to realize large plastic deformation by pure shearing. E engineering design, bannari amman institute of technology, tamilnadu, india 2asst professor, dept. Equalchannel angular extrusion process of lotustype. Pdf equal channel angular extrusion characteristics on.
Hartwig equal channel angular extrusion ecae has great potential for developing ultra. The friction and wear properties of 65mn processed by equal channel angular extrusion ecae assisted by ultrasonic and subsequent heat treatment processing under dry sliding condition were evaluated on a block on ring mm2000 tribometer. Oyebanji abstract large uniform plastic strain has been effectively introduced in bulk materials using equal channel angular extrusion ecae process. Fcc metals with different stacking fault energy sfe, namely al, cu and ag have been investigated for the evolution of crystallographic texture during ecae deformation using route a. Equal channel angular extrusion for bulk processing of feco. Equal channel angular extrusion of flat products request pdf. Contributors from russia, the us, asia, and europe present recent work in grain refinement mechanisms in spd, the positive role of back pressure in equal channel angular extrusion, creep and mechanical properties of a commercial aluminum alloy processed by ecap, and local investigations of the mechanical properties of ultrafine grained metals by nanoindentations. Grain refinement in beryllium by equal channel angular.
In this paper, several topics on ecae of materials for potential automotive applications are. Different materials with different sfe result in their characteristic textures. Equalchannel angular pressing ecap is an effective tool for producing ultra fine grained materials. Equalchannel angular extrusion process of lotustype porous. Equal channel angular extrusion processing of alloys for improved mechanical properties principal investigator. The principle of ecae is based on severe plastic deformation application, through the imposture.
This article describes the mechanics and processing characteristics of equal channel angular extrusion ecae. Abstract the equal channel angular extrusion ecae process is a promising technique for imparting large plastic deformation to materials without a resultant decrease in crosssectional area. Development of a submicrometergrained microstructure in. Equal channel angular extrusion an overview sciencedirect topics. One method of producing ultrafine grains in metals is by imposing very large strains. Simulation of equalchannel angular extrusion pressing. Technical university stankin, russian federation abstract. The work piece is placed in one channel and extruded into. Compared to classic plastic deformation, the process is technically simple but the material experiences, instantly, large plastic deformation. The technique is able to refine the microstructure of metals and alloys, thereby improving their strength according to the hallpetch relationship. Simulation of the equal channel angular extrusion technology prof. Lavanya textbook engineering metal engineering metal processing. And it has become a new process for preparing ultrafine grained uniform microstructure and. Finite element analysis of the plastic deformation zone and.
Ma is a highintensity ball milling process that can be used to produce nanocrystalline and amorphous powders. The results have been analysed on the basis of microstructural features and related established concepts on texture evolution in fcc. During ecae, severe plastic strains and simple shear deformation mode contribute to strong, sometimes unusual effects of processing on structure and properties. Ultrafinegrained be is the material of choice for fabrication of the nif target capsules. And it has become a new process for preparing ultrafine grained uniform microstructure and minimizing contamination. Equal channel angular extrusion for bulk processing of fe. In 2014 alloy deformed by equal channel angular extrusion process ecae the changes in the size and shape of structural constituents were examined. With this process micrometer or even nanometer grain size is obtained in processed materials. A sciences fondamentales et engineering, n 16 janvier 2017 page 47 a 55 determined using a least squares regression fitting and their values are presented in table1. Texture evolution in commercially pure titanium after warm. In this study, we investigate the erosion resistance and mechanical properties of ti5al5mo5v3cr alloy against silica slurry, which is formed by an equal channel angular extrusion ecae process in.
Herein, we compare the room temperature quasistatic and dynamic mechanical properties of the asecae processed plates with textures a and c to the subsequently rolled sheet material. Deformation behavior of lotustype porous copper with long cylindrical pores aligned in one direction through equalchannel angular extrusion ecae process. The experimental researches on equal channel angular extrusion ecae process of commercial available al6061 alloy were conducted and the grain. An ebsd investigation of interstitialfree steel subjected. With this grain reduction after thermal treatments, the mechanical properties of the billet are greatly increased. Previous work has shown that powdersource be can be successfully processed by ecae. Design and fabrication of equal channel angular extrusion process analysis for nonferrous materials dr. At the same time the practical realization of this technique is a rather challenging task. Characteristics of commercially pure aluminum 1020 deformed by equal channel angular through routes a and c s. Equal channel angular extrusion for development of advanced.
Upperbound analysis of equal channel angular extrusion. Analysis of hdpe behavior during two equal channels. In this work, ntype polycrystalline bi 2 te 3 based alloys with uniform microstructure were fabricated by applying equal channel angular extrusion ecae method to extrude the cast ingot directly for four passes at 783 k. Analysis of equal channel angular extrusion by upper bound. Upperbound analysis of equal channel angular extrusion using. Finite element analysis of the plastic deformation zone.
Process modelling of equal channel angular pressing for ultrafine. Application of equal channel angular extrusion to semisolid processing of magnesium alloy jufu jiang a,b. Equal channel angular extrusion ecae is a relatively new metal working process which is capable of producing ultrafine submicron grain smg structure by means of intense plastic straining without a change in shape or dimensions of the worked material. Microstructure evalution of equal channel angular extrusion. Numerical estimation of frictional effects in equal channel. The aim of the work is a numerical analysis of the conditions of az61 rods processing in modified ecae method. In part i, equal channel angular extrusion ecae was demonstrated as a novel, simpleshear deformation process for producing bulk forms of the low ductility feco2v hiperco 50a soft ferromagnetic alloy with refined grain sizes. Texture evolution in equalchannel angular extrusion.
Ecae equal channel angular extrusion iron processing. This article shows the results of the simulation of the equal channel angular extrusion in parallel channels taking into account the radius of the channel conjugation. Equalchannel angular pressing is implemented by repeatedly pressing. Equal channel angular extrusion ecae is an innovative technique whose importance has grown in recent years. Enhancement of mechanical properties of aa 6351 using. To this end, the material parameters of an elastoviscoplastic. Equal channel angular extrusion of aa 6063 using conventional. It was first invented and put forward by segal in the 1980s. This is connected with the fact that the material during the eca pressing is subjected to large strains under high imposed pressure at. Equal channel angular extrusion processing of alloys for. Such mechanism of deformation is known in literature as equal channel angular extrusion ecae. First sample was made from several vertical layers of different color plasticine figure 1a.
The focus of this article is texture development in metals of fcc, bcc, and hcp crystal structure processed by a severe plastic deformation spd technique called equalchannel angular extrusion ecae or equalchannel angular pressing ecap. Investigation into energy dissipation in equal channel. Comparative study of the required force for performing. The purpose of this study is to numerically estimate the friction coefficient for equal channel angular extrusion with and without back pressure. In industrial metalworking, it is an extrusion process, the technique is able to refine the microstructure of metals and alloys, thereby improving their. In the present work, an extrusionequal channel angular extrusion execae process composed of two processes, extrusion and ecae, is developed. Equal channel angular extrusion ecae has been used to achieve these high strains. Numerical analysis of az61 magnesium alloy extrusion process by modified equal channel angular extrusion ecae method received primljeno. Apply ecae processing to produce advanced, lightweight materials with enhanced formability, higher. Equal channel angular extrusion ecae is a promising novel technique for inducing microstructural refinement in polycrystalline materials by imposing large plastic strains. Microstructure evalution of equal channel angular extrusion in aluminium 5083 alloy by cryogenic treatment rajeshwaran. The samples subjected after deformation to additional annealing at 300c10min were characterized by larger grains of nearlyequiaxial shapes. Use of high intensity milling and equal channel angular. Of mechanical engineering, bannari amman institute of technology, tamilnadu, india.
Finite element analysis of the plastic deformation zone and working load in equal channel angular extrusion s. A new design for equal channel angular extrusion j. Principle of this method consists of severe deformations of massive samples realised by shear without change of cross section. Equal channel angular extrusion ecae is an extrusion process, developed in the early 1990s in the soviet union. The initial lamellae coarse grains with hundreds of microns were broken down efficiently and refined uniformly to only 1020. Previously, we developed a rolling schedule for equal channel angular extruded ecae az31 magnesium mg alloy plate material. Herein, we compare the room temperature quasistatic and dynamic mechanical properties of the asecae processed plates with textures a. Between these techniques, the ecae equal channel angular extrusion was developed, or ecap equal channel angular pressing. Semicontinuous equalchannel angular extrusion and rolling of. Development of a submicrometergrained microstructure in aluminum 6061 using equal channel angular extrusion volume 12 issue 5 stephane ferrasse, vladimir m. By the example of polypropyleneorganic montmorillonite composite ppommt, the abilities of the method of equal channel multiangular extrusion have been studied with respect to the modification of the structure and the properties of polymeric nanocomposites. Microstructure and properties of al6061 alloy by equal channel.
959 1104 513 1129 719 1045 643 1028 1547 752 33 1082 469 1442 920 975 1353 386 268 1046 1077 1411 305 1433 858 74 1227 1216 1441 59 105 14 1150 799 944 1172 1083 2 615 208 450 410 327 1003 1339 1366