|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Precipitation Processes and Related Strengthening Mechanisms in a Nanostructured 6082 Aluminium Alloy
||Malgorzata Lewandowska, Witold Chrominski
|On-Site Speaker (Planned)
In SPD processed ultrafine grained materials, precipitation processes are significantly affected by the high surface area of grain boundaries and local dislocation structure. In this work, a 6082 aluminium alloy was subjected to solution annealing, water quenching, hydrostatic extrusion (with accumulated total true strain of 4.6) and ageing at 100 and 160oC for various times. The microstructure after hydrostatic extrusion is inhomogeneous and depends on the grain orientation. Such local inhomogeneities strongly influence the precipitation processes. Homogeneous precipitation in grain interiors takes place only in microsized grains with dislocation substructure. In small grains surrounded with high angle grain boundaries, extensive precipitation at grain boundaries occurs with no precipitates in grain interiors. Based on quantitative microstructure evaluation, contributions of different strengthening mechanisms were estimated and compared to experimental results.
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