II. GDmposition and preparation of alloys 273 III. Heat treatment and aging 273 1. Effect of quenching temperature 278 2. Effect of aging temperature 281 3. Effect of temperature of quenching bath 285 4. Effect of prior heating at quenching temperature 293 5. Effect of preheating to 515C before quenching from lower tem- peratures 293 IV. Miscellaneous tests 293 1. Density and dilatation 296 2. Electrical resistivity 297 V. Mechanism of hardening during aging after rapid cooling 299 1. Structure of duralumin 306 2. Analogy between the hardening of duralumin and that of steel ... 310 3. Eutectic structure and influence of magnesium 311 VI. Conclusions relative to the manufacture and heat treatment of duralumin 3 14 VII. Summary and conclusions 315 I. INTRODUCTION
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Merica et al. (1919) studied this question.
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