Some tests of light aluminium casting alloys--The effect of heat treatment .. . Fig. 15.—Specimen E5-M1. X50The path of fracture in cast alloys I^M Bureau of Standards Technologic Paper No. 139. Fig. i6.—Specimen H2-4. X50 The path of fracture in cast alloys ^^^i^^^^^g^gmgsmmmmmmSMmmsssssaam .up——IW« Tests of Light Casting Alloys 15 The alloys were subjected to the salt-spray test for two periodsof one month each, and were examined at the end of each periodto determine the relative amount of corrosion. This was esti-mated by appearance only, as it is practically impossible to deter-mine it by
Some tests of light aluminium casting alloys--The effect of heat treatment .. . Fig. 15.—Specimen E5-M1. X50The path of fracture in cast alloys I^M Bureau of Standards Technologic Paper No. 139. Fig. i6.—Specimen H2-4. X50 The path of fracture in cast alloys ^^^i^^^^^g^gmgsmmmmmmSMmmsssssaam .up——IW« Tests of Light Casting Alloys 15 The alloys were subjected to the salt-spray test for two periodsof one month each, and were examined at the end of each periodto determine the relative amount of corrosion. This was esti-mated by appearance only, as it is practically impossible to deter-mine it by loss in weight on account of the adherence of theproducts of corrosion and the lack of a satisfactory reagent toremove the rust without affecting the metallic aluminmn. The alloys were cast 1/4 inch thick, about 1/8 inch was thenmilled from one surface so that one exposed surface was as cast,and the other was machined. The specimens were 2 incheswide and 4 inches long. The designation of the cast alloys, with their composition andtreatment, is given in the following table: Marked Treatment Composition A-30-A As cast Al+5 per cent Mg. A-30-A-A Annealed 500° C Do. CA 40 A .... Al+3
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