THE MECHANICAL PROPERTIES OF ALUMINIUM-LITHIUM ALLOYS

摘要: The mechanical properties of aluminum-lithium alloys made from high- purity materials were determined. best combination in the binary system is gifen by with a lithium content approximately 2 to 2.5%, after solution-treatment at 580 deg C and aging 130 C. are capable age-hardening; strength in- creased, but ductility decreased, this has restricted their use. A third metal (zinc, magnesium, tin, or copper) was added 2% alloy an attempt not only increase its without sacrificing too much ductility, also proof stress so that high values may be prifuary importance. Preliminary tests showed additions zinc tin did result any substantial improvement. Additions magnesium copper beneficial certain treatments; 1% prcduces sheets which, hot-rolled, solution-treated, aged condition, have stress, tensile strength, elongation 11 tons,/in./sup 2/, 17 tons/in./sup 14%, respectively, thus giving value 7 for strength: weight ratio. Higher strengths can attained, expense ofmore » ductility; e.g. when increased 1.75%, cold rolled subsequently had 28 2/ 6.5%, 2.25% corresponding 32 5. Although these figures promising commercial purposes, advantage it possible obtain 12 (auth)« less