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首页> 外文期刊>Materials Science and Technology: MST: A publication of the Institute of Metals >Performance of AlTi5Bl, AlTi3B3 and AIB3 master alloys in refining grain structure of aluminium foundry alloys
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Performance of AlTi5Bl, AlTi3B3 and AIB3 master alloys in refining grain structure of aluminium foundry alloys

机译：AlTi5B1，AlTi3B3和AIB3中间合金在细化铸造铝合金的晶粒结构中的性能

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摘要

The capacity of AITi5B1, AITi3B3 and AIB3 grain refiners to refine the grain structures of AISi7Mg and AISi11Cu2 foundry alloys was investigated. The performance of AITi5B1, well established to be the best grain refiner for wrought aluminium alloys, is not nearly as good with the AISi7Mg and AISi11Cu2 alloys. Relatively smaller grains are obtained with the AITi3B3 grain refiner in both alloys. The AIB3 grain refiner, on the other hand, improves the grain structure only as much as the AITi5B1 grain refiner does. With as much as 0-04-0-1 wt-%Ti, the commercial alloys cannot enjoy the outstanding potency of the AIB_2 particles since the B supply is readily transformed to TiB_2 particles. However, the grains of the Ti free AISi7Mg and AISi11Cu2 alloys (-0-005 wt-%Ti) are very small and nearly globular for the entire range of holding times when inoculated with AIB3, implying not only a remarkable grain refining capacity but also a strong resistance to fading of the grain refinement effect. The lack of Ti in the melt allows the entire B to form AIB_2 particles, the perfect substrates to promote the nucleation of a-AI crystals. Aluminium castings can enjoy grain sizes well below 200 p:m, with an addition of 0-02 wt-%B, provided that they are Ti free. That the potent substrates are made available just before the nucleation of a-AI crystals avoids fading effects and is a further advantage of the AIB3 grain refiner in recycling operations.
机译：研究了AITi5B1，AITi3B3和AIB3晶粒细化剂细化AISi7Mg和AISi11Cu2铸造合金的晶粒结构的能力。 AITi5B1的性能已被公认是锻造铝合金的最佳晶粒细化剂，但与AISi7Mg和AISi11Cu2合金相比，其性能却差强人意。使用AITi3B3晶粒细化剂可以在两种合金中获得相对较小的晶粒。另一方面，AIB3晶粒细化剂只能像AITi5B1晶粒细化剂那样改善晶粒结构。由于Ti的供应量很容易转化为TiB_2颗粒，因此，当Ti含量高达0-04-0-1 wt％时，商用合金无法享受到AIB_2颗粒的出色效能。但是，无AlAlSi7Mg和AlSi11Cu2合金（-0-005 wt %% Ti）的晶粒在接种AIB3时在整个保持时间范围内都非常小，几乎呈球形，这意味着不仅晶粒显着，而且晶粒细化抵抗晶粒细化效果的减弱。熔体中缺乏Ti可使整个B形成AIB_2颗粒，这是促进a-AI晶体成核的理想基质。如果不含钛，则铝铸件的晶粒尺寸可远低于200 p：m，并添加0-02 wt %% B。仅在a-AI晶体成核之前就可以使用有效的基材，从而避免了褪色的影响，这是AIB3晶粒细化剂在回收操作中的又一优势。

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