(中北大学 材料科学与工程学院，太原 030051)
摘 要: 采用高能行星球磨机制备不同Er含量的Al-Ti-B复合粉末细化剂，并利用XRD、SEM和定量金相技术对Al-Ti5-B1-Er复合粉末细化再生3104铝合金组织的效果进行研究。结果表明：Al-Ti5-B1-Er复合粉末细化剂预制块在700 ℃下保温30 min后，组织为Al3Ti、Al3Er、TiB2和Ti2Al20Er。随着Al-Ti5-B1-Er复合粉末细化剂中Er含量的增加，再生3104铝合金晶粒显著细化，晶粒由粗大枝晶逐渐等轴化。同商业Al-Ti5-B1中间合金细化剂相比，经Al-Ti5-B1-Er复合粉末细化剂细化的再生3104铝合金细化响应快于 Al-Ti5-B1中间合金的；且Al-Ti-B-Er复合粉末预制块细化剂在细化30 min时达到最佳效果，晶粒尺寸(159±59) μm，比Al-Ti-B中间合金细化最优值提高45%。
关键字: 再生3104铝合金；稀土Er；AlTi5B1；细化剂
（School of Materials Science and Engineering, North University of China, Taiyuan 030051, China）
Abstract: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.
Key words: recycled 3104 alloy; rare earth Er; AlTi5B1; refiner
