Significant improvements in mechanical properties of AA5083 aluminum alloy using dual equal channel lateral extrusion

作     者：N.FAKHAR F.FERESHTEH-SANIEE R.MAHMUDI N FAKHAR;F FERESHTEH-SANIEE;R MAHMUDI

作者机构：Department of Mechanical EngineeringFaculty of EngineeringBu-Ali Sina University School of Metallurgical and Materials EngineeringCollege of EngineeringUniversity of Tehran 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2016年第26卷第12期

页      面：3081-3090页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：partially supported by the Iran National Science Foundation(INSF) with grant number 92014140 

主　　题：AA5083 aluminum alloy severe plastic deformation dual equal channel lateral extrusion hardness homogeneity 

摘      要：Dual equal channel lateral extrusion (DECLE), as a severe plastic deformation (SPD) process, was employed forimproving the mechanical properties of AA5083 aluminum alloy. Several experiments were conducted to study the influences of theroute type, namely A and B, and pass number on mechanical properties of the material. The process was conducted up to 6 passeswith decreasing process temperature, specifically from 573 to 473 K. Supplementary experiments involving metallography, hardnessand tensile tests were carried out in order to evaluate the effects of the process variables. The hardness measurements exhibitedreasonably uniform distributions within the product with a maximum increase of 64% via a 6-pass operation. The yield and ultimatestrengths also amended 107% and 46%, respectively. These significant improvements were attributed to the severe shear deformationof grains and decreasing pass temperature, which intensified the grain refinement. TEM images showed an average grain sizereduction from 100 μm for the annealed billet to 200 nm after 6 passes of DECLE. Finally, the experimental findings for routes A andB were compared and discussed and some important conclusions were drawn.