(1. 清华大学 材料科学与工程系， 北京 100084;
2. 清华大学 摩擦学国家重点实验室， 北京 100084)
摘 要: 研究了Al3Ti4B细化剂和Al10Sr变质剂对ZL107合金显微组织的影响。结果表明： 单一Al3Ti4B细化剂的添加量大于0.6%时，可使ZL107合金获得100～120μm左右的等轴枝晶，且其抗衰退期至少不小于240 min，但对共晶硅没有变质作用；而一定量的Al10Sr变质剂除了至少能在240min内使共晶硅充分变质外， 还对初生α(Al)晶粒具有一定的细化作用；当Al3Ti4B细化剂和Al10Sr变质剂共同作用于ZL107合金时， Al-Sr有效变质时间大为减少，晶粒有所长大，但两者在合适的匹配添加量时，可获得与单一添加时相似或相同的细化、 变质效果。
关键字: Al3Ti4B细化剂； Al-Sr变质剂； ZL107合金； 显微组织； 细化； 变质
（1. Department of Material Science and Engineering, Tsinghua University, Beijing 100084, P.R.China;
2. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, P.R.China）
Abstract:The effect of Al3Ti4B/Al10Sron ZL107 alloy was investigated. Equiaxed dendritic grains of 100～120 μm were attained with fading time of at least 240 min through addition of morethan 0.6% Al3Ti4B alone, though the laminar morphology of eutectic Si kept unchanged. Eutectic Si was completely modified for more than 240min throughaddition of Al10Sr alone,which was also beneficial to refining the primary α(Al). The combined addition of both Al3Ti4B and Al10Sr resulted in shorter effective time for modification and slightly coarser grain size. It was found that satisfactory results could be attained for both grain refinement and modification with combination of Al3Ti4B and Al10Sr at a suitable addition rate.
Key words: Al3Ti4B master alloy； Al-Sr master alloy；ZL107 alloy； microstructures; refinement； modification
