From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Notes on the solidification and cooling of piston metal, detailing the effects of cooling rates on alloy structure.
| Identifier | ExFiles\Box 76\3\ scan0004 | |
| Date | 16th February 1916 | |
| Laboratory L529 contd page 3. The effect of rate of cooling is also shown by X Y & Z, cooled slowly, rapidly & chilled respectively. Tensile test-pieces are being made from part of Y & Z (will be reported later). In the light of the cooling curves (with tin) the following stages may be noted during the solidification & cooling of piston metal. (i) Solidification of Aluminum from various centres (the greater the number the more rapid the cooling) this occurs at 623°C (38°C lower than in the case of pure Aluminum). At 547°C the solid soltn of Copper & Aluminum changes to virtually pure copper & aluminum. If cooled rapidly the copper is retained to a large extent in solid solution. This gives a closer metal free of pores which is stronger mechanically & probably less liable to electrolytic action (see report L527). | ||