By Grard C.
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Extra info for Aluminium And Its Alloys
The presence of more t h a n 1 % of iron usually causes faultycastings which are useless. As a rule, the amount of silicon is about one-third of t h a t of the iron, and rarely exceeds onehalf. Group II: Various impurities, other than alumina. These impurities, with careful working, are present only in relatively small quantities, less than 1 %, but their estimation is necessary, since, owing to some accident during the working, t h e y may attain abnormal proportions. Group III: Alumina. I t is impossible to emphasise too much the importance of this impurity.
T h i c k ) 50 TOO 150 Cold 200 300% 250 Work' F I G . 4»—Variation i n Mechanical (tensile) Properties C o l d "Work. R E S U L T S O F T E S T S . Fig. 4 summarises (1 m m . thickness) After discussing point nesses t h e results cut t h e the sheets for test pieces of t h e T y p e 16 longitudinally. results out t h e variations of with obtained observed, comprising for d u e to t h e thin this t h e type, different series, a n d w e will thickt o t h e 24 ALUMINIUM AND ITS ALLOYS direction, longitudinal or transverse, in which the test pieces were cut.
Length 100 m m . Between shoulders < Breadth 20 m m . [Thickness 1 mm. Area of cross section 20 sq. mm. Gauge l e n g t h = V 6 6 : 6 7 i = 3 6 m m . TYPE I C . (Length 100 m m . Between shoulders -J Breadth 20 mm. (Thickness 1-5 m m . Area of cross section 30 sq. mm. Gauge l e n g t h = v / 6 6 * 6 7 s = 4 5 mm. * These values are only approximate. , and the exact cross section calculated from these figures. 20 ALUMINIUM AND ITS ALLOYS ID. [Length 100 mm. Between shoulders \ Breadth 20 mm. [Thickness 2 mm.