Effect of In-Situ TiB2 Particles on the Creep Properties of 3 Wt.% TiB2/Al-Cu-Mg-Ag Composite

Creep Behavior of Additively Manufactured High Strength A205 Aluminum Alloy

“…5 (b) is a normalized steady-state strain rate plot with stress normalized by temperature-compensated shear modulus (22.6 GPa), with the strain rate normalized using temperature-compensated shear modulus, self-diffusivity of aluminum (2.67 × 10 − 20 and 1.90 × 10 − 19 m 2 /s at 180 and 200°C, respectively) [40] and Burgers vector of pure Al (0.286 nm). A comparison is made between the creep performance in the present work and that of cast 3 wt.% TiB 2 /Al-Cu-Mg-Ag alloy [16] ; this reveals that the cast counterpart has slightly better ( ≈ factor of 3) creep resistance than the LPBF component. Similar observations were made by Shakil et al [17] for ambient temperature creep of the cast and the AM A205 owing to a lower density of Ω-precipitates and higher PFZ fraction in the AM alloy.…”

“…Potential structural applications of the LPBF A205, such as heat exchangers [13] , require an understanding of high-temperature mechanical behavior, especially creep. The creep behavior of Al-Cu-Ag-Mg alloys has been studied previously [14][15][16][17][18] , and there is a consensus that A205 alloy derives its strength from co-precipitation of 𝜃′ / 𝜃′′ and Ωphases in the intragranular region [19] . Due to the apparent stability of Ω-precipitates, these alloys show superior creep properties up to 200°C.…”

“…The effect of reinforcements, such as TiB 2 and TiC x , in improving the creep properties has been reported in Al-Cu alloys [ 16 , 20 ]. For example, Al-Cu-Ag-Mg alloy with TiB 2 reinforcement exhibited superior creep performance in the stress range of 150-275 MPa at 200°C compared to the conventional alloy [16] .…”