Mechanical properties and microstructure of thin plates of A6061 wrought aluminum alloy using rheology forging process with electromagnetic stirring

Jin, Chul Kyu; Bolouri, Amir; Kang, Chung Gil

Abstract

We propose the possibility of fabricating A6061 thin plates using the rheology forging process. Electromagnetic stirring (EMS) is used to fabricate a semi-solid slurry. A thin plate is formed by injecting the slurry into the forging die. When the punch speed used to compress the slurry is low, turbulent flow occurs. When the punch speed is high, laminar flow occurs, and the solid and liquid phases move simultaneously. For a pressure of 150 MPa or below, incomplete filling behavior and cracks occur. For a pressure of 200 MPa or above, a durable formed product can be obtained. However, the differences between the mechanical properties according to the application of EMS and pressure are slight. The microstructure of the slurry without EMS has an unclear distinction between the liquid phase and solid phase. However, the microstructure of the thin plates formed by using this slurry has a clear distinction between the liquid and solid with respect to the spheroid shapes. The tensile strength and elongation for a thin plate formed with a punch speed of 300 mm/s and pressure of 250 MPa with EMS slurry are 169 MPa and 11.0 pct, respectively. After T6 heat treatment, the tensile strength improves to 305 MPa. © 2013 The Minerals, Metals & Materials Society and ASM International.

• Presentation Conference Type: Conference Paper (published)
• Acceptance Date: Dec 3, 2013
• Online Publication Date: Dec 3, 2013
• Publication Date: Jan 1, 2014
• Journal: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
• Print ISSN: 1073-5615
• Electronic ISSN: 1543-1916
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 45
• Issue: 3
• Pages: 1068-1080
• DOI: https://doi.org/10.1007/s11663-013-9993-7
• Keywords: thin plates, A6061, rheology forging process. electromagnetic stirring
• Public URL: https://uwe-repository.worktribe.com/output/824864
• Publisher URL: http://dx.doi.org/10.1007/s11663-013-9993-7