Investigation of mechanical properties of Al3Zr intermetallics at room and elevated temperatures using nanoindentation. (March 2023)

• Record Type: Journal Article
• Authors: Priyadarshi, Abhinav; Subroto, Tungky; Nohava, Jiri; Pavel, Sedmak; Conte, Marcello; Pericleous, Koulis; Eskin, Dmitry; Tzanakis, Iakovos
• Is Part Of: Intermetallics. Volume 154(2023)
• Publication Date: 2023-03
• Subjects: Al3Zr intermetallic -- Depth sensing indentation -- Mechanical properties -- Elastic modulus -- Creep -- High temperature; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2023.107825
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: This work deals with the measurement of mechanical properties of single and polycrystalline Al3 Zr specimens from ambient to elevated temperatures using nano-indentation experiments. In this study, we employed three kinds of intermetallic specimens produced from Al3 Zr crystals chemically extracted from an Al-3 wt% Zr alloy. The properties such as elastic modulus and hardness were determined under quasistatic loading conditions. Constant multicycle indentation testing (MCT) was further performed using a Vickers indenter to understand the fatigue response of intermetallics at high load low cycle conditions. The results showed that hardness and elastic modulus of Al3 Zr intermetallics depended on the crystal structure/orientation, with polycrystalline samples showing higher elastic modulus than single crystal specimens at room temperature conditions. MCT experiments revealed that contact pressure of more than 7 GPa was needed to fracture a crack-free crystal under dynamic loading conditions. Consequently the properties of intermetallics at temperatures up to 700 °C were determined for the first time, using high-temperature nano-indentation technique. Elevated temperature measurements indicated that intermetallics had high creep resistance at low and intermediate temperatures, but exhibited significant plastic deformation and creep close to the melting point of pure aluminium. Highlights: Mechanical properties of Al3 Zr crystals measured using instrumented nanoindentation. Properties show strong dependence on intermetallic orientation and structure. A crack-free crystal sustains cyclic loading pressure of 7 GPa without fracturing. Hardness and elastic modulus of a crystal decrease with increasing temperature.