Novel method of screw extrusion for fabricating Al/Mg(macro-) composites from aluminum alloy 6063 and magnesium granules

作     者：Kristian Gr tta SKORPEN Eirik MAUL Oddvin REISO Hans J rgen ROVEN 

作者机构：Department of Materials Science and Engineering Norwegian University of Science and Technology R&D Materials Technology Hydro Aluminium AS Center for Advanced Materials Qatar University 

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

年 卷 期：2014年第24卷第12期

页      面：3886-3893页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主　　题：Al/Mg composites extrusion microstructure mechanical properties 

摘      要：A novel method of screw extrusion was used for producing a bimetal composite Al/Mg from granules containing aluminium alloy 6063 （AA6063） and commercial pure magnesium. Up to 12.5%（mass fraction） pure magnesium was added to the aluminium alloy. In general, the material consisted of a fine grained microstructure. In addition to the phases originating from the input materials, intermetallic phases were observed as islands consisting of the Al2Mg3 phase surrounded byγ-Mg17Al12, throughout the microstructure. The mechanical properties of the extruded material showed a gradual increase in strength with increasing the addition of Mg. The highest registered UTS, well above 350 MPa, was observed for the material containing 10%Mg. Examinations of the fracture surfaces indicated that increasing the magnesium content led to a higher degree of brittle fracture and a gradual change of the fracture micro-mechanisms. The optimization of the post-extrusion processing conditions is still ongoing.