Some tests of light aluminum casting alloys — the effect of heat treatment. . Fig. 3.—Specimen E5-M4. X20 Fig. 4.—Specimen E5-M4. Xioo. iinM ifwS£ilHEo«l ^^^^^^^^^P 1111 dBBMBl Fig. 5.—Specimen E6-M7. X50 Fig. 6.—Specimen E7-M11. X50 The structure of the alloy containing 8 per cent of copper. All specimens etched with per cent NaOH Bureau of Standards Technologic Paper No. 139

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