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| >> GLOSSARY OF TERMS |
| ALCLAD The common name for a type of clad wrought aluminum products, such as sheet and wire, with coatings of high-purity aluminum or an aluminum alloy different from the core alloy in composition. The coatings are anodic to the core so they protect exposed areas on the core electrolytically during exposure to corrosive environments, |
| ALLOTROPY See Polymorphism. |
| ALLOY (Met.) Metal prepared by adding other metals or non-metals to a basic metal to secure desirable properties. |
| ALLOY STEEL Steel containing substantial quantities of elements other than carbon and the commonly-accepted limited amounts of manganese, sulfur, silicon, and phosphorous. Addition of such alloying elements is usually for the purpose of increased hardness, strength or chemical resistance. The metals most commonly used for forming alloy steels are: nickel, chromium, silicon, manganese, tungsten, molybdenum and vanadium. "Low Alloy" steels are usually considered to be those containing a total of less than 5% of such added constituents. |
| ALPHA BRASS A copper-zinc alloy containing up to 38% of zinc. Used mainly for cold working. |
| ALPHA BRONZE A copper-tin alloy consisting of the alpha solid solution of tin in copper. Commercial forms contain 4 or 5% of tin. This alloy is used in coinage, springs, turbine, blades, etc. |
| ALPHA IRON The polymorphic form of iron, stable below 1670°F. has a body centered cubic lattice, and is magnetic up to 1410°F. |
| ALUMINUM (Chemical symbol Al] Element No. 13 of the periodic system; Atomic weight 26.97; silvery white metal of valence 3: melting point 1220°F.; boiling point approximately 4118°F.; ductile and malleable; stable against normal atmospheric corrosion, but attacked by both acids and alkalis. Aluminum is used extensively in articles requiring lightness, corrosion resistance, electrical conductivity, etc. Its principal functions as an alloy in steel making: [1] Deoxidizes efficiently (See Aluminum Killed) (2) Restricts grain growth (by forming dispersed oxides or nitrides) (3) Alloying element in nitriding steel (see). |
| ALUMINUM KILLED STEEL A steel where aluminum has been used as a deoxidizing agent. (See Killed Steel.] |
| AMORPHOUS Non-Crystalline. |
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