A201 alloys and A201 alloys with the addition of 1 wt. % silicon were investigated in the as cast, solution treated and aged conditions. They were investigated by a combination of HRSEM, TEM and EDS. The addition of Si was used to improve the castability of the basic alloy, but it was found that 1 wt. % Si wasn’t enough to improve fluidity and prevent hot tearing. It was found that the addition of Si alloy increased the average grain size after solution treatment at 550°C for 19 hours, and large particles of secondary phases were precipitated at the GBs, also increased the precipitation of Ω phase during aging and, by these means, increased the microhardness of the A201 alloy, despite of coarser grain structure of this alloy. There are two kinds of phases were precipitated during aging at 170°C in both investigated alloys, tetragonal lath-shape θ′ phase and orthorhombic polygonal Ω phases with different of the amount, size and shape of precipitates.
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- Microstructure and Phase Evolution in A201 Alloys with Additions of Silicon
S. Abd El Majid
- Springer International Publishing
in-adhesives, MKVS, Hellmich GmbH/© Hellmich GmbH, Zühlke/© Zühlke