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).
Physical and mechanical properties of the alloy 'Hiduminium' R.R. 53.C.
| Identifier | ExFiles\Box 116\2\ scan0129 | |
| Date | 22th December 1939 guessed | |
| Physical and Mechanical Properties of “HIDUMINIUM” R.R. 53.C. SPECIFICATIONS .. .. .. { As Cast D.T.D. 313, Heat Treated D.T.D. 309 SPECIFIC GRAVITY .. .. .. .. 2.73 CO-EFFICIENT OF THERMAL EXPANSION.. { 20-100°C .. 22.0 x 10⁻⁶, 20-200°C .. 23.2 x 10⁻⁶ THERMAL CONDUCTIVITY { IN C.G.S. UNITS .. 0.415, AS A PERCENTAGE OF COPPER 54 FATIGUE LIMIT .. { Sand cast, heat treated, tons/sq. in. ± 7.2 at 20,000,000 reversals { Chill cast, „ „ „ „ + 8.4 MECHANICAL PROPERTIES. Tensile Tests on Bars cast to 1 in. dia. in B.S.I. Sand Lined Mould and machined to 0.564 in. dia. | Condition. | 0.1% Proof Stress Tons per sq. in. | Ultimate Stress Tons per sq. in. | Elongation % on 2". | Brinell Hardness No. | |---|---|---|---|---| | As Cast .. .. | 5—6 | 10—12 | 2—3 | 60—68 | | Solution Treated .. | 9—10 | 14—15 | 2.5—3 | 70—75 | | Solution Treated and Aged .. .. | 18—20 | 19—22 | 1—2 | 100—115 | Tensile Tests on Chill Cast Bars 1 in. dia. Machined to 0.564 in. dia. | Condition. | 0.1% Proof Stress Tons per sq. in. | Ultimate Stress Tons per sq. in. | Elongation % on 2". | Brinell Hardness No. | |---|---|---|---|---| | As Cast .. .. | 6.5—7 | 11—13 | 2—3 | 65—70 | | Solution Treated .. | 10—12 | 17—19 | 2—3 | 75—85 | | Solution Treated and Aged .. .. | 19—21 | 22—24 | 1—2 | 110—121 | TENSILE TESTS ON SAMPLES CUT FROM 36 IN. DIA. SAND CAST RING AND MACHINED TO 0.564 IN. DIA. [Image of a 36" diameter sand cast ring with 7 locations for test pieces marked on it.] | Position of Test Piece. | Ult. Stress Tons per sq. in. | Elongation % | |---|---|---| | 1 | 19.2 | 1.0 | | 2 | 19.2 | 1.5 | | 3 | 18.1 | 1.0 | | 4 | 17.6 | 1.5 | | 5 | 17.4 | 1.0 | | 6 | 17.4 | 1.0 | | 7 | 18.1 | 1.5 | | ||