Investigation into quasi-static and dynamic tensile mechanical properties of aluminium–scandium alloy

Abstract

The mechanical properties of aluminium–scandium alloy are investigated at strain rates ranging from 0.0005 to 2600 s⁻¹ and a temperature of 25°C using a material testing system and split-Hopkinson tensile bar. The temperature dependence of the material response is investigated at elevated temperatures of 100 to 300°C under a strain rate of 0.0005 s⁻¹. The flow stress increases with increasing strain rate but decreases with increasing temperature. The scanning electron microscope observations reveal that the fracture surface contains a large number of dimpled structures with intermetallic precipitates, which suggests a ductile failure mode. Material constants for a combined Johnson-Cook/Cowper-Symonds constitutive model are determined to describe the dynamic behaviours of aluminium–scandium alloys.

KEYWORDS:

• Aluminium–scandium alloy
• dynamic behaviour
• constitutive model
• finite element simulation

Acknowledgements

The authors would like to express their sincere gratitude to the Ministry of Science and Technology of the Republic of China, Taiwan, for the financial support provided to this study under Contract Nos. MOST 108-2622-8-006-014 and MOST 108-2221-E-492-021-MY2.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors would like to express their sincere gratitude to the Ministry of Science and Technology of the Republic of China, Taiwan, for the financial support provided to this study [Contract Nos. MOST 108-2622-8-006-014 and MOST 108-2221-E-492-021-MY2].