Effects of Adding Process on Yield of Zr Element and Solidification Structure

摘要:

Zr元素在超高强铝合金中的应用可以追溯到B96铝合金，Zr元素已成为超高强铝合金中不可缺少的微量元素。本实验分别采用Al-Zr中间合金、氟锆酸钾和复合锆盐3种工艺加入Zr元素，研究了熔炼温度对Zr元素收得率和凝固组织的影响，熔炼温度及加入工艺对Zr元素存在形式的影响。结果表明：采用复合锆盐加入法，Zr元素的收得率最高，细化效果最好。在750 ℃采用Al-Zr中间合金加入法，试样中含Zr相较为粗大，组织细化效果不好

Abstract:

Zr has become an indispensable trace element in the super-high strength aluminium alloy. In the present work, three Zr adding methods were adopted, that is adding aluminium zirconium master alloy, adding K2ZrF6 and adding composite zircon salt. The effects of melting temperature on the yield of Zr were studied, and the effects of different Zr element adding techniques on the existence form of Zr in aluminium alloy matrix were also researched. The results show that the yield of Zr is the highest and the grain refinement effect is the best upon adding composite zircon salt. The second phase containing Zr is coarse and the grain refinement effect is not good upon adding aluminium zirconium master alloy at 750 oC