Kazi kuu za vipengele vya alloying na vipengele vya uchafu katika 4000 mfululizo wa alumini
(1) Silikoni: Silicon ni sehemu kuu ya aloi katika safu hii ya aloi, yenye maudhui ya ω(Na)=4.5%~13.5%. Silicon hasa ipo katika umbo la α+Si eutectic na β(Al 3 Jibu) katika aloi. Kadiri maudhui ya silicon yanavyoongezeka, eutectic huongezeka, the fluidity of the alloy melt increases, and the alloy strength and wear resistance also increase. .
(2) Nickel and iron: Nickel and iron can form an intermetallic compound that is insoluble in aluminum, which can increase the high temperature strength and hardness of the alloy without reducing its linear expansion coefficient.
(3) Copper and magnesium: Copper and magnesium can generate Mg 2 Na, CuAl 2 and S phases to improve the strength of the alloy.
(4) Chromium and titanium: Chromium and titanium can refine grains and improve the air tightness of the alloy.