铝青铜是一类强度高、减磨性与耐蚀性兼优的铜合金。然而单纯铜铝二元合金在机械制造中不常使用,因为含铝量低时强度很低,含铝量高时当从高温冷却下来的速度不够时,在565℃会发生B→α+γ_2的共析转变使合金变脆,这叫自然退火。为了避免自然退火,往往加入铁、镍等元素以遏制共析转变。有铁与镍形成的四元合金——铝铁镍青铜具有最优良 Aluminum bronze is a class of high strength, wear resistance and corrosion resistance and excellent copper alloy. However, pure copper and aluminum binary alloys are not often used in mechanical manufacturing because the strength is low when the content of aluminum is low, and B → α + γ_2 occurs at 565 ℃ when the aluminum content is high when the speed of cooling from high temperature is not enough. The eutectoid transformation makes the alloy brittle, which is called natural annealing. In order to avoid natural annealing, often add iron, nickel and other elements to curb the eutectoid transformation. Quaternary alloy with iron and nickel - aluminum-iron-nickel bronze has the best