Al-Ti5-B1-Er復(fù)合粉末對(duì)再生3104鋁合金細(xì)化效果

Al-Ti5-B1-Er復(fù)合粉末對(duì)再生3104鋁合金細(xì)化效果Refinement of Al-Ti5-B1-Er composite powders on recycled 3104 alloy

采用高能行星球磨機(jī)制備不同Er含量的Al-Ti-B復(fù)合粉末細(xì)化劑，并利用XRD、SEM和定量金相技術(shù)對(duì)Al-Ti5-B1-Er復(fù)合粉末細(xì)化再生3104鋁合金組織的效果進(jìn)行研究。結(jié)果表明：Al-Ti5-B1-Er復(fù)合粉末細(xì)化劑預(yù)制塊在700 ℃下保溫30 min后，組織為Al3Ti、Al3Er、TiB2和Ti2Al20Er。隨著Al-Ti5-B1-Er復(fù)合粉末細(xì)化劑中Er含量的增加，再生3104鋁合金晶粒顯著細(xì)化，晶粒由粗大枝晶逐漸等軸化。同商業(yè)Al-Ti5-B1中間合金細(xì)化劑相比，經(jīng)Al-Ti5-B1-Er復(fù)合粉末細(xì)化劑細(xì)化的再生3104鋁合金細(xì)化響應(yīng)快于 Al-Ti5-B1中間合金的；且Al-Ti-B-Er復(fù)合粉末預(yù)制塊細(xì)化劑在細(xì)化30 min時(shí)達(dá)到最佳效果，晶粒尺寸(159±59) μm，比Al-Ti-B中間合金細(xì)化最優(yōu)值提高45%。

Al-Ti-B composite powders with different Er contents were prepared by high energy planetary mill, the effect of refining of Al-Ti5-B1-Er composite powders on recycled 3104 alloy was studied. The results show that the microstructures of the sintered Al-Ti5-B1-Er composite powder preform are mainly composed of Al3Ti, Al3Er, TiB2 and Ti2Al20Er phases. With the increase of Er in the Al-Ti5-B1-Er composite powder, the grain size of the 3104 aluminum alloy is significantly refined, and the grain is gradually changed from the coarse dendrite to the equiax. Compared with the commercial Al-Ti5-B1 master alloy, Al-Ti5-B1-Er composite powders refiner has much faster refining effect on recycled 3104 alloy, which gains the minimum grain size (159±59) μm after melt treatment 30 min.

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