Finite element modeling of creep deformation in dendritic alloys
نویسندگان
چکیده
Finite element modeling is used to simulate the secondary creep rate of alloys with an inhomogeneous distribution nano-precipitates, located within colonies long, parallel dendrites, due elemental segregation during directional solidification. Three-dimensional, periodic unit cells are created approximate aligned dendritic microstructure, cylindrical dendrites (with high resistance nanoprecipitates) embedded a precipitate-free matrix low resistance). Using power-laws for and precipitation-strengthened aluminum alloy computed various dendrite geometry volume fraction. When stress applied long axis, calculated rates in reasonable agreement measurements, at 300 °C, Al-0.07Sc-0.05Zr (at.%) consisting pure Al containing 50–60 vol% strengthened L1 2 -Al 3 (Sc,Zr) nanoprecipitates. Calculations cases where aligned, ridged (emulating stubs) or bridged arms) predict that these geometries, constant fraction loading, strengthen less efficiently as compared uniform reflecting effective load transfer between two phases. perpendicular response becomes dominated by which shows higher stresses than under leading much rates. Alloys show lowest strain alignment arms (bridges) load, increasing dendrites.
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ژورنال
عنوان ژورنال: Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
سال: 2022
ISSN: ['0921-5093', '1873-4936']
DOI: https://doi.org/10.1016/j.msea.2021.142171