Dynamic deformations tests of Ni3Al based intermetallic alloy by using the split Hopkinson pressure bar technique

Abstract

In this work, the Ni 3 Al-based intermetallic alloy was subjected to room temperature dynamic plastic deformation tests by using a split Hopkinson pressure bar technique. The dynamic compression processes were carried out at strain rates in the range of =(1.9×10 2 ÷ 1×10 4 s -1 ). A strong impact of applied deformation conditions on microstructure and mechanical properties evolution in the examined Ni 3 Al intermetallic, was documented. Generally, very high maximum compressive stress values were obtained, reaching 5500 MPa for the sample deformed at the highest strain rate (i.e. =1×10 4 s -1 ). The results of performed SEM/EBSD evaluation point towards an occurrence of dynamic recovery and recrystallization phenomena in Ni 3 Al samples deformed at high strain rates.

Application of two-step diffusion couple technique in high-throughput screening of optimal composition and aging temperatures for alloys design: A demonstration in binary Ni-Al system

“…Ni-based superalloys, mainly consisting of chemically disordered γ matrix and chemically ordered γ' precipitates, are widely used as engine blades and turbine discs in aerospace fields because of their excellent mechanical performance at high temperatures [1][2][3][4]. The performances of alloys are closely related to their microstructures, such as volume fraction, grain size, and morphology of the γ' precipitates, which strongly depend on alloy composition and heat-treatment processes.…”