Microstructural Characterization of Rapidly Solidified Al-High Si Alloys

Abstract

Aluminium silicon alloys are the most used raw material for automotive applications. One of the main limitations on using aluminium high silicon alloys is the formation of coarse brittle phases under conventional solidification conditions. However, rapid solidification processing (RS) (for example, through melt spinning) is very effective in limiting the coarsening of primary silicon due to the high cooling rate. In the present work, characterisation of the material at the first stage of production as melt-spun ribbon and flake has been carried out. The microstructures show typical characteristics of a ‘featureless zone’ on the wheel-side and coarser microstructures on the air-side, with clusters of silicon particles evident. At high magnification, on the wheel-side, TEM and FEGSEM reveal local variations in the silicon and aluminium content (although on average there is no macrosegregation from the wheel-side to the air-side during solidification). In FEGSEM, the ‘rosette-structure’ also displays local variations in Al, Si, Fe, Cu and Ni over a scale of a few microns.

Hardness of Rapidly Solidified Al-High Si Alloys

“…Materials used in this work were produced by RSP company in The Netherlands and Bodycote HIP in the UK and have been characterised in detail in [21]. The alloys examined here are denoted 446-2, 446-3, 461, 444 and 431.…”

Optimization Strategy for Molecular Dynamics Simulations of Nanometric Cutting of Aluminium Alloy Using Molecular Modelling

“…Several aluminium alloys are serving a wider range of applications owing to their varying physical, chemical, and mechanical properties resulting from their various elemental compositions, and finding usefulness in the construction of aeroplanes and other forms of transport and machining process [4]. In die casting, for instance, especially casting intricate geometries and areas with thin thickness aluminium alloys are most preferred due to their high corrosion resistance, maintaining strength at high temperatures, possessing high thermal and electrical conductivity, and providing high dimensional stability.…”