航空器每减少一磅重量可节约燃油15～20加仑,若整机采用铝锂合金代替传统的铝镁合金,则机重可减少15％,以20年寿命计,就可减少燃油消耗480万加仑。在铝合金中,每加入1％锂,可减少重量3％,增加刚性6％。一种名为2090的合金,可取代高强度7075-T6x合金,其σb=(82～88)×10~3磅/时_-~2,拉伸屈服强度=(75～81)×10~3磅/时_-~2,δ=9～12％,K1c=25～30千磅·时/时~2, For every pound of weight reduction, the aircraft can save 15-20 gallons of fuel. If the machine uses aluminum-lithium alloy instead of the traditional aluminum-magnesium alloy, the weight of the aircraft can be reduced by 15%. With a 20-year life expectancy, the fuel consumption can be reduced by 4.8 million gallons . In the aluminum alloy, each added 1% lithium, can reduce the weight of 3%, 6% increase in rigidity. An alloy named 2090 can replace the high-strength 7075-T6x alloy with σb = (82-88) × 10-3 lb / hr_- 2 and tensile yield strength = (75-81) × 10 ~ 3 pounds / hour _- 2, δ = 9-12%, K1c = 25-30 kbs · hour / hour ~ 2,