E.1 Binary 11.8% aluminium alloy (chill cast)
Prepared as E2.
As polished, sometimes oxide and porosity are visible.
The structure consists of grains of martensitic beta (or beta1) with occasionally, thin boundary precipitates of alpha. The martensitic makings are characteristic of the rate of cooling obtained by chill casting. The grains are columnar in shape.
obtained
occasionally
boundary
precipitates