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).
Data sheet detailing the physical and mechanical properties of the alloy Hiduminium RR.77.
| Identifier | ExFiles\Box 116\2\ scan0137 | |
| Date | 22th December 1939 guessed | |
| HIDUMINIUM RR.77 Physical Properties. SPECIFIC GRAVITY .. .. .. .. 2.80 SPECIFIC WEIGHT, lbs. per sq. inch .. .. 0.101 CO-EFFICIENT OF THERMAL EXPANSION 20—100° C. .. .. 20 x 10⁻⁶ 20—200° C. .. .. 22 x 10⁻⁶ 20—300° C. .. .. 23 x 10⁻⁶ 20—400° C. .. .. 25 x 10⁻⁶ ELECTRICAL CONDUCTIVITY— Solution treated and artificially aged .. reciprocal ohms per Cm³ .. 200,100 Solution treated and naturally aged .. ” ” ” .. 185,800 Annealed .. .. .. .. .. .. ” ” ” .. 261,000 THERMAL CONDUCTIVITY (Calculated)— Solution treated and artificially aged—in C.G.S. units .. .. 0.340 as a percentage of copper .. .. 37 Solution treated and naturally aged—in C.G.S. units .. .. 0.320 as a percentage of copper .. .. 34 Annealed—in C.G.S. units .. .. 0.421 as a percentage of copper .. .. 44.5 YOUNG'S MODULUS (E.{Mr Elliott - Chief Engineer}), lbs. per sq. inch .. .. 10.0 x 10⁶ GENERAL MECHANICAL PROPERTIES. | Condition. | IN TENSION. | | | IN COMPRESSION. | | Brinell Hardness No. | Endurance limit at 20 x 10⁶ cycles. | |---|---|---|---|---|---|---|---| | | 0.1% Proof stress t/sq. in. | Ultimate stress t/sq. in. | Elongation % | 0.1% Proof stress t/sq. in. | 0.5% Proof stress t/sq. in. | | | | Solution treated and artificially aged. | 28-33 | 33-38 | 16-10 | 27-30 | 32-36 | 160-180 | ±12.5-13.0 | | Solution treated and naturally aged. | 18-21 | 29-32 | 21-16 | 17-21 | 22-25 | 130-140 | — | | Annealed | 4-8 | 12-14 | 20-14 | 4-8 | 7-9 | 45-65 | — | Extruded bars and sections and drawn tubes in this alloy are supplied by the Reynolds Tube Co., Ltd., Birmingham, while sheet or strip are obtainable from the Reynolds Rolling Mills, Ltd., Birmingham. P.T.O | ||