On the Monotonic and Cyclic Behavior of an Al‐Mg‐Zn‐Cu‐Si Compositionally Complex Alloy

Abstract

In the present study, monotonic and cyclic properties of a novel Al‐Mg‐Zn‐Cu‐Si compositionally complex alloy (CCA) were investigated. Microstructural studies revealed that eutectic phase and fishbone‐type structures are embedded by the Al matrix. The mechanical properties of this CCA obtained under compressive loading were found to be promising. However, low ultimate strength and brittle behavior were observed under tension. The fatigue performance of the alloy in the low‐cycle fatigue (LCF) regime was poor. Microstructural features and fracture surface analysis point to the fact that the presence of brittle intermetallic phases and shrinkage defects are responsible for the poor tensile properties and inferior LCF behavior. Homogenization at 460 °C and 465 °C for 3 h, 6 h and 24 h resulted in spheroidization of all coarse precipitates. However, the heat treatment used herein could not enhance the mechanical properties of this CCA.This article is protected by copyright. All rights reserved.

Integrity Assessment of Electron‐Beam‐Welded Joints of Additively Manufactured AlSi10Mg Components

“…Besides, the shrinkage defects present in the cast part are suitable sites for fatigue crack initiation. [ 44,45 ] In the AM–AM joint, the fatigue crack was initiated on the WZ. This could be linked to the presence of large cavities formed during EBW.…”