7050铝合金晶粒细化剂的选择和应用

Aluminum Alloy Grain Refiner Selection and Application

Zr元素对Al-Ti-B中间合金有严重的"毒化"作用,因此,在生产7050等含Zr的Al-Zn-Mg-Cu系超高强度铝合金时不宜使用Al-Ti-B中间合金细化晶粒。Al-Ti-C有效地改善了Al-Ti-B的缺点,降低偏聚倾向,对"中毒"起抑制或免疫作用。生产7050铝合金铸锭时,控制Zr含量小于0.12%,将铝熔体温度控制在730℃以下,使用Al-3Ti-0.15C中间合金细化晶粒不会产生细化"中毒",有很好的细化效果。

Zr elements has serious poisoning effect on Al-Ti-B master alloy,therefore,Al-Ti-B grain refiner can not be used in 7050 Al-Zn-Mg-Cu ultrahigh strength aluminum alloy with Zr elements.Al-Ti-C effectively improves the shortcomings of Al-Ti-B,and reduces the segregation tendency of poisoning effect or immune suppressing effect.In the 7050 aluminum ingot production,the control Zr content is less than 0.12%,the aluminum melt temperature controlled below 730 ℃,the use of Al-3Ti-0.15 C master alloy grainer has a good refinement effect without poisoning effect.