Aluminium And Its Alloys by Grard C.

By Grard C.

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A) Thin Series EXPEEIMEKTAL DETAILS OP THE TESTS. The tests were carried out on two series of tensile test pieces from sheets of aluminium, the one 0-5 mm. thick, Type l a , THIN SERIES (Test Pieces 0'5mm. thick) TOO 200 300 400 500 6 0 0 °C Temperature F I G . —Variation in Mechanical Properties o n Annealing a t d i f f e r e n t T e m p e r a t u r e s a f t e r 100 % C o l d W o r k . the other, 2-0 includes metal 300 %. mm. in thick, three Type degrees Id. of Each cold of work, these 50, 100, series and ALUMINIUM A M ) ITS ALLOYS 30 INVESTIGATION OF THE DURATION OF TIME NECESSABY FOB COMPLETE ANNEAL AT VABIOTJS TEMPEBATUBES.

Corresponding with a Tensile Strength of approximately 10 kg. per sq. mm. (6-35 tons per sq. ). I n the case of t h e thick series, the maximum hardness, as also the maximum Tensile Strength, occurs at 200 % cold work. (b) Shore Scleroscope Tests on thin sheets. As ball tests are impossible on thin sheet, rebound tests were made, using the Shore apparatus, on sheets of the thin series, possessing respectively 50 %, 100 %, and 300 % cold work. The average scleroscope numbers of sheets 1 and 2 mm.

Cold: work 50 % 0-88 0-84 0-25 0-26 0-36 0-30 0-97 0-39 0-26 0-93 0-41 0-34 Iron Silicon Alumina . Cold work . 0-81 . 0-32 . 0-24 100 % 0-83 0-38 0-29 0-70 0-23 0-26 0-81 0-23 0-24 Iron Silicon Alumina . . • Cold iwork 0-88 0-31 0-17 300 % 0-77 0-46 016 0-85 0-56 0-24 0-72 0-46 0-22 Thickness Iron Silicon 23 MECHANICAL P R O P E R T I E S NUMBER OF T E S T S . For each degree of cold work, two sheets were used for the tensile tests, and in each sheet three test pieces were cut longitudinally and three transversely.

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