Aluminium And Its Alloys by Grard C.

By Grard C.

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Consequently, if work hardening is undesirable, even a very small amount of deformation must be avoided, since the changes in the properties t a k e place very markedly from the outset. (ii) The maximum cold work, beyond which deterioration and disintegration m a y set in, is reached when the Tensile Strength is approximately doubled. " L O X U E N C E OE THICKNESS ( T H I N S E R I E S ) . The variation in thickness between 0-5 mm. and 2-0 mm. exerts only a slight effect on the results, so t h a t t h e mean curve given for test pieces of 1-mm.

99-00 % 0-64 % 0-33 % 0-03 % traces. 98-80 % 0-72 % . 0-08 % traces. ALUMINIUM AND ITS ALLOYS 26 Cold work 100 % :— Aluminium Iron . Silicon Carbon Alumina 98-60 % 0-84 % 0-41 % 0-07 % traces. THICK SERIES (Longitudinal) 11 10 50 T5o T$o Cofd 2ocT 250 Work F I Q 5 » — V a r i a t i o n i n M e c h a n i c a l P r o p e r t i e s w i t h Cold W o r k . Cold work 300 % :— Aluminium Iron . Silicon Carbon Alumina 99-01% 0-61 % 0-33 % 0-03 % traces. 27 MECHANICAL P R O P E R T I E S Figs.

Thick 2 mm. thick As annealed . 4-5 5-5 5 0 % cold work . 16-0 11-5 100 % cold work . 24-0 14-0 300 % cold work . 28-0 16-0 The scleroscope numbers vary with the thickness, but, whatever the thickness, the scleroscope number of completely annealed metal varies between 4 and 6, providing, therefore, a convenient means of verifying the extent of anneal. SHOCK T E S T S . , with a Mesnager notch of 2 mm. depth, using a 30 kg. m. charpy pendulum of t h e Conservatoire des Arts et Metiers. The results are also shown in Fig.

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