Dynamic fracture mechanism of quasicrystal-containing Al–Cr–Fe consolidated using spark plasma sintering

• Main Authors: Khor, Khiam Aik, Li, Ruitao, Wang, Zhiyong, Li, Zhong, Dong, Zhili
• Other Authors: School of Materials Science & Engineering
• Format: Article
• Language: English
• Published: 2018
• Subjects: DRNTU::Engineering::Materials; Spark Plasma Sintering; Quasicrystals
• Online Access: https://hdl.handle.net/10356/89151; http://hdl.handle.net/10220/47017
• Institution: Nanyang Technological University

The potential applications of quasicrystals (QCs) in automotive and aerospace industries requires the investigation of their fracture and failure mechanisms under dynamic loading conditions. In this study, Al–Cr–Fe powders were consolidated into pellets using spark plasma sintering at 800 °C for 30 min. The microhardness and dynamic failure properties of the samples were determined using nanoindentation and split-Hopkinson pressure bar technique, respectively. Scanning electron microscopy and transmission electron microscopy were employed to analyze fracture particles. The dynamic failure strength obtained from the tests is 653 ± 40 MPa. The dynamic failure process is dominated by transgranular fracture mechanisms. The difficulty in the metadislocation motion in the dynamic loading leads to the high brittleness of the spark plasma sintered (SPSed) Al–Cr–Fe materials.