title: Improved microstructure and mechanical properties in gas tungsten arc welded aluminum joints by using graphene nanosheets/aluminum composite filler wires.
abstract: In the present study, different amounts of graphene nanosheets (GNSs) were added to the 4043 aluminum alloy powders by using the mechanical alloying method to produce the composite filler wires. With each of the produced composite filler wires, one all-weld metal coupon was welded using the gas tungsten arc (GTA) welding process. The microstructure, mechanical properties and fracture surface morphology of the weld metals have been evaluated and the results are compared. As the amount of GNSs in the composition of filler wire is increased, the microstructure of weld metal was changed from the dendritic structure to fine equiaxed grains. Furthermore, the tensile strength and microhardness of weld metal was improved, and is attributed to the augmented nucleation and retarded growth. From the results, it was seen that the GNSs/Al composite filler wire can be used to improve the microstructure and mechanical properties of GTA weld metals of aluminum and its alloys.
authors: Technical Inspection Engineering Department, Petroleum University of Technology, Abadan, Iran. Electronic address: fattahi.put@gmail.com.
authors: M
authors: M
authors: Fattahi
authors: Technical Inspection Engineering Department, Petroleum University of Technology, Abadan, Iran.
authors: A R
authors: AR
authors: Gholami
authors: Mechanical Engineering Department, University of Tabriz, Tabriz, Iran.
authors: A
authors: A
authors: Eynalvandpour
authors: Materials Engineering Department, Sahand University of Technology, Tabriz, Iran.
authors: E
authors: E
authors: Ahmadi
authors: Materials Engineering Department, Isfahan University of Technology, Isfahan, Iran.
authors: Y
authors: Y
authors: Fattahi
authors: Materials Engineering Department, Isfahan University of Technology, Isfahan, Iran.
authors: S
authors: S
authors: Akhavan
keywords: Aluminum matrix composite; Graphene nanosheets; Mechanical properties; Microstructure