【摘要】 借助X射线衍射(XRD)、扫描电镜(SEM)、光学显微镜(OM)等分析技术,研究了采用熔配法制备新型RE-Al-Ti-B中间合金时,强力搅拌对RE-Al-Ti-B中间合金显微组织的影响,并进一步研究了RE-Al-Ti-B中间合金对α-Al重熔细化组织的影响。结果表明,强力搅拌对RE-Al-Ti-B中间合金显微组织产生重要影响,强力搅拌后中间合金组织分布越均匀,有效形核核心越多,对α-Al的重熔细化效果越好。随着重熔次数的增加,形核核心聚集沉淀,有效形核核心减少,重熔细化效果衰退。更多还原

【Abstract】 A new green aluminum grain refiner RE-Al-Ti-B master alloy was prepared by mix-melting method.The effects of powerful mechanical stir on RE-Al-Ti-B master alloy were analyzed,and the effects of the master alloy on the microstructure of remelting refiner grain were studied by XRD,SEM and OM.The experiments show that the effect of powerful mechanical stir on the microstruture of RE-Al-Ti-B master alloy is very positive and strong.The more evenly the microstructure’s distributeon of the master alloy after powerful mechanical stir,the more the effective nucleation cores and the better the results of remelting refiner of α-Al.With the increase of the remelting times,nucleation core gathers and deposits,the effective nucleation cores reduce,the remelting refining effects declines.更多还原