Cavitation-resistant intergranular precipitates enhance creep performance of θ'-strengthened Al-Cu based alloys.

ABSTRACT: Tensile and compressive creep properties of a quaternary Al-Cu-Mn-Zr (ACMZ) alloy and its commercial counterpart (Al-Cu-Mn-Zr with Ni, Co and Sb additions, RR350) are investigated at 300° C. At low stresses up to 30 MPa where diffusional creep dominates, creep resistance is the same in tension and compression and RR350 deforms more slowly than ACMZ, consistent with RR350 alloy's larger linear fraction of intergranular precipitates (Al₇ Cu₂ (NiFe) and Al₉ FeNi for RR350 vs. θ-Al₂ Cu for ACMZ) and a reduced fraction of precipitate-free zones near grain boundaries. At stresses between 30 and 80 MPa, dislocation creep with a stress exponent n ~ 3 becomes rate-limiting in compression, which is expected to be controlled by θ'precip

SUBMITTER: Rakhmonov JU 

PROVIDER: S-EPMC9683481 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature