(1. 清華大學 材料科學與工程系， 北京 100084;
2. 清華大學 摩擦學國家重點實驗室， 北京 100084)
摘 要: 研究了Al3Ti4B細化劑和Al10Sr變質(zhì)劑對ZL107合金顯微組織的影響。結(jié)果表明： 單一Al3Ti4B細化劑的添加量大于0.6%時，可使ZL107合金獲得100～120μm左右的等軸枝晶，且其抗衰退期至少不小于240 min，但對共晶硅沒有變質(zhì)作用；而一定量的Al10Sr變質(zhì)劑除了至少能在240min內(nèi)使共晶硅充分變質(zhì)外， 還對初生α(Al)晶粒具有一定的細化作用；當Al3Ti4B細化劑和Al10Sr變質(zhì)劑共同作用于ZL107合金時， Al-Sr有效變質(zhì)時間大為減少，晶粒有所長大，但兩者在合適的匹配添加量時，可獲得與單一添加時相似或相同的細化、 變質(zhì)效果。
關(guān)鍵字: Al3Ti4B細化劑； Al-Sr變質(zhì)劑； ZL107合金； 顯微組織； 細化； 變質(zhì)
（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
