Dmj. Wilkes et H. Jones, Structure and properties of rapidly-solidified Al-rich Al-Mn-Si alloys - Part II - Atomized powder, its extrudate and the effect of blended-in SiC, J MATER SCI, 34(4), 1999, pp. 749-761
Argon atomized Al-5 Mn-3 Si (wt %) powder has been extruded with and withou
t 15 vol % added SIC particulate at 425 degrees C and characterized both as
extruded and after 100 and 1000 h at 425 degrees C. As extruded matrix mic
rostructure of discrete alpha AlMnSi particles of mean diameter 60 nm in an
alpha Al matrix was similar to that for comparable melt-spun ribbon after
2 to 5 h at 425 degrees C and coarsening of alpha AlMnSi in 100 and 1000 h
at 425 degrees C was also comparable. Hardness and proof strength of the ma
trix as extruded and their decrease on heat treatment matched predictions o
f a combined Orowan and Hail-Fetch model as for the melt-spun condition. In
itial hardness and tensile properties of the matrix were similar to those o
f extruded AI-Fe-V-Si with the same (similar to 15) vol per cent of silicid
e. Increment in Young's modulus of similar to 30 GPa when SIC was present w
as similar to that for Al-Fe-V-Si/SiC MMC, while increments in strength and
decrements in elongation to fracture were smaller for the Al-Mn-Si/SiC MMC
. (C) 1999 Kluwer Academic Publishers.