Study On Microstructure Of Plastic Deformation And Mechanical Properties Of AZ61Magnesium Alloy Processed By Extrusion-Shearing

As a mature processing, Extrusion can refine the grain effectively and improve theductility of the magnesium alloy. Equal channel angular pressing (ECAE) is a new processingwhich develop from the basis of the extrusion processing, it can refine grain and improve themechanical properties of the metal. The paper’s aim is combine the two processes to play theirrespective advantages and develop a new method, that is extrusion-shear processing, short forES processing.The study select AZ61magnesium alloy as the research object, measure date in hotGleeble1500-mechanical simulation machine,and import the material properties of AZ61magnesium alloy, to DEFORM-3D software, on this basis, for each influencing factors forfinite element simulate and analyze the results to give the process parameters of product AZ61magnesium alloy, including extrusion temperature, extrusion speed, friction conditionscomply and extrusion ratio. According to the simulation, actual bar can be produced in theactual production, and get a conclusion by experimental verification. Finally, analysis of themicrostructure and mechanical properties of AZ61magnesium alloy, after combining thefinite element simulation and experimental results, we can get the following conclusions:(1) DEFORM-3D finite element simulation software simulation of AZ61magnesiumalloy after ES extrusion deformation, the extrusion temperature in the actual production theextrusion and speed friction conditions will have some impacts on the deformation resistanceof the material, for this work the extrusion temperature is400°C, the extrusion speed is10mm/s, and the friction factor is0.4;(2) After ES extrusion deformation analysis die structure’s effection to properties of AZ61magnesium alloy, find the smaller the ES die’s corner and the higher extrusion ratio are, thegrain size is finer, hardness,yield strength and the room temperature toughness have greatlyimproved compared with the previous;(3) The the secondary phase component of AZ61magnesium alloy surface containsMg17Al12and Al8Mn5, they are distributed within the grains and grain boundariesrespectively, after homogenization, the second phase has been dissolved.(4)By XRD analysis, although extruded rod materials and patrs are different, all thestrongest peaks of the bar head is{10—11}and the secondary peaks is {0002}, thecorresponding central and tail strongest front and the second strongest peak is just the opposite.(5) AZ61magnesium alloys bar of different extrusion ration in ES die carry out finiteelement simulation and experimental validation, conclude that: the extrusion ratio is lager, thestrain and strain rate is greater the value of dynamic recrystallization more serious, the grain is finer andits mechanical properties is better.