Some tests of light aluminum casting alloys — the effect of heat treatment. . Fig. 9.—Specimen H1-2. X50 Fig. 10.—Specimen A2-1. X50 Structure of cast alloys. All specimens etched with per cent NaOH Bureau of Standards Technologic Paper No. 139 Y- ri ? i? L, X fW- v--^ r \-S~i a i^* & k i W %^3m. i is. * J S&Jy ° * Fig. ii.—Specimen H6-C. Xioo. Fig. 12.—Specimen C15-B. X50

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