Year: 2022
Type: article
Abstract: The room temperature plasticity of the cubic C15 CaAl2 Laves phase was investigated using nanomechanical testing and electron microscopy. The correlation between slip traces in the vicinity of nanoindents and crystallographic orientation data allowed us to gain statistical data on the activated slip and crack planes for 10 different crystallographic orientations. Slip on {1 1 1} and {1 1 2} planes was found to be most favourable for all orientations, whereas cracks predominantly occurred on {1 1 2} planes. A constant hardness of 4.9 ± 0.7 GPa and an indentation modulus of 85.5 ± 4.0 GPa for all investigated orientations for a constant strain rate and a strain rate sensitivity of 0.028 ± 0.019 were measured. Micropillar compression tests and transmission electron microscopy confirmed slip on {1 1 1} and {1 1 2} planes with a Burgers vector of <11¯0 > type. This allowed to determine the critical resolved shear stresses as 0.99 ± 0.03 GPa for {1 1 1}<11¯0 > and 0.97 ± 0.07 GPa for {1 1 2}<11¯0 > slip.
Source: Materials & Design
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,630
Awards: G1480773307, SFB 1394: Strukturelle und chemische atomare Komplexität – Von DefektPhasendiagrammen zu Materialeigenschaften, Fundamental Building Blocks – Understanding plasticity in complex crystals based on their simplest, intergrown units, G40501573, G4056264897, Kombinatorische und prozessintegrierte Entwicklung metallischer Verbundwerkstoffe und Werkstoffverbunde
OpenAlex ID: W4313421877