Mechanical Properties and Joinability of AlSi9 Alloy Manufactured by Twin‐Roll Casting. Issue 10 (13th September 2022)

• Record Type: Journal Article
• Authors: Neuser, Moritz; Kappe, Fabian; Ostermeier, Jakob; Krüger, Jan Tobias; Bobbert, Mathias; Meschut, Gerson; Schaper, Mirko; Grydin, Olexandr
• Is Part Of: Advanced engineering materials. Volume 24:Issue 10(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-09-13
• Subjects: aluminum casting alloys -- mechanical joinability -- mechanical properties -- self-pierce riveting -- twin-roll casting; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.202200874
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : AlSi casting alloys combine excellent castability with high strength. Hence, this group of alloys is often used in the automotive sector. The challenge for this application is the brittle character of these alloys which leads to cracks during joint formation when mechanical joining technologies are used. A rise in ductility can be achieved by a considerable increase in the solidification rate which results in grain refinement. High solidification rates can be realized in twin–roll casting (TRC) by water‐cooled rolls. Therefore, a hypoeutectic EN AC–AlSi9 (for European Norm ‐ aluminum cast product) is manufactured by the TRC process and analyzed. Subsequently, joining investigations are performed on castings in as‐cast and heat‐treated condition using the self‐piercing riveting process considering the joint formation and the load‐bearing capacity. Due to the fine microstructure, the crack initiation can be avoided during joining, while maintaining the joining parameters, especially by specimens in heat treatment conditions. Furthermore, due to the extremely fine microstructure, the load‐bearing capacity of the joint can be significantly increased in terms of the maximum load‐bearing force and the energy absorbed. Abstract : Casting alloys of the AlSi system are especially suitable for applications in which high strength is required. Through high solidification rates, as achieved in twin‐roll casting (TRC), it is possible to achieve a very fine microstructure as well as a significant increase in mechanical properties and joinability, which reduce the susceptibility of cracking.