Strong Aluminum Alloys |
Common terms and phrases
17S sheet Alclad 17S Alclad 17ST sheet alloying elements Aluminum Company amount of cold-work application ature bend radius BOSTON ELEVATED RAILWAY Brinell hardness C17S Special 17S C17SW Special 17SW cent cipitation heat treatment CIVIL ENGINEERING BERKELEY commercially pure aluminum Company of America corrosion crease critical dispersion elongation erties extruded factor of safety forgings forming operations hardening heat treated castings heat treated temper heat treatment processes indicates working bend lower manganese manufactured mechanical prop mechanical properties ment metal modulus of elasticity obtained ordinary 17ST ordinary temperatures particles point and hardness possible pounds per square precipitation heat treatment protection rate of solution rial sand castings shown in Table sizes solution heat treatment specific gravity spontaneous aging square inch steel strain-hardened strength and hardness strength and yield strong alloys strong aluminum alloys structural shapes surface tensile properties tensile strength thickness UNIVERSITY OF CALIFORNIA Width wrought alloys yield point
Popular passages
Page 46 - ... allowed to cool slowly in the furnace to a temperature of 500° F. This cooling rate should not exceed 50° F. per hour. Solution Heat-Treatment Practice : It should be stated at the outset that accurate temperature control is necessary if proper results are to be obtained with heat-treatable aluminum alloys. The temperature limits for the solution heat treatment are rather close, and strict adherence to these limits is essential. Heating is, perhaps, most easily accomplished in a bath of fused...
Page 36 - ... for a period of one year. At the end of this period, they were expected to be able to obtain admission in other schools.
Page 23 - ... bending equipment which is used. Frequently, a small change in the tools has been found sufficient to obviate the necessity of choosing a soft temper or a softer alloy. In some cases, this change consisted only in the slight rounding of a sharp edge or merely a polishing operation to improve the surface so as to prevent the metal from flowing into scratches or flaws in the tools, which action would cause the metal to tear. In certain difficult forming operations, it may be necessary to resort...
Page 35 - The thickness of the high-purity surface films is so chosen as to retain the maximum physical properties consistent with adequate protection of the alloy core against corrosion.
Page 24 - ... surface so as to prevent the metal from flowing into scratches or flaws in the tools, which action would cause the metal to tear. In certain difficult forming operations, it may be necessary to resort to several successive draws with intermediate annealing, starting, of course, with annealed material. The final choice of the alloy or of the working radius should be based on a trial under the conditions to be used in production. The relative ease of forming is also affected by the nature of the...
Page 36 - The thickness of the aluminum surface layer is so chosen as to retain the maximum physical properties consistent with adequate protection of the underlying alloy. In the heat treated temper, the tensile strength and yield point are approximately 10 per cent lower than the corresponding properties of ordinary 17S. The elongation is very nearly the same in the two products. These values are calculated, of course, on the total thickness of the Alclad sheet.
Page 15 - Tensile Strength Lbs. Per Sq. In. Yield Point Lbs. Per Sq. In. Elongation % in 2 In.
Page 46 - ... following process must be used for metal in the heat-treated temper. The alloy is heated at a temperature of 750° F. to 800° F. for about two hours, and is then allowed to cool slowly in the furnace to a temperature of 500° F. This cooling rate should not exceed 50° F. per hour. Solution Heat-Treatment Practice : It should be stated at the outset that accurate temperature control is necessary if proper results are to be obtained with heat-treatable aluminum alloys. The temperature limits...
Page 49 - For 5iS and 538, the preferred temperature limits are 310° F. to 320° F., and the aging time is eighteen hours. Some experimentation may be required to determine the best aging time for a given class of material. It should be remembered that aging for too long a time or at too high a temperature will lower the elongation and eventually the tensile strength as well. If the temperature is too low, much longer aging periods are required to bring about the proper improvement of the alloys. ALUMINUM...