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7, 8, and 9 summarise the results obtained. STAGES OP A N N E A L I N G . Whatever the amount of work, the following stages can be distinguished:— (i) Region of cold work, (ii) Region of softening, (iii) Region of complete anneal, (iv) Region of f alling-off of Elongation. thick) 100 200 300 400 500 600°C Temperature FIG. —Variation in Mechanical Properties on Annealing after 50 % Cold Work. (i) Region of Cold Work ; 0-150°. Within this range, t h e properties remain similar t o those which the m e t a l possesses in t h e particular cold-worked state, 32 ALUMINIUM AND I T S ALLOYS as given in Fig, 4.

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. Area of cross section 40 sq. mm. Gauge length= ^ Thick Series TYPE II. [Length 100 mm. Between shoulders J Breadth 15 mm. [Thickness 10 mm. Area of cross section 150 sq. mm. Gauge l e n g t h = ^66-678= 100 mm. TESTING LABORATORIES. The experiments on the variation of mechanical properties with cold work (thin series) and the cupping tests (both in t h e worked and annealed states) were carried out at the " Chalais M e u d o n " Laboratory.

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.

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Aluminium And Its Alloys by Grard C.

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