Towards industrial Al-Nb-B master alloys for grain refining Al-Si alloys
Towards industrial Al-Nb-B master alloys for grain refining Al-Si alloys
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DOI：
10.1016/j.jmrt.2019.09.031
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发表时间：
2019-11-01
影响因子：
6.4
通讯作者：
Babu, N. Hari
中科院分区：
文献类型：
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作者：
Bolzoni, L.;Babu, N. Hari
人们早就知道，由于钛和硅之间的反应，铸造铝硅合金不能可靠地、一致地用含钛母合金进行晶粒细化。在过去的几年里，我们开发和研究了新的铌基晶粒细化剂，不断证明了Nb + B孕育对铸造合金的有效性，研究了不同冷却条件下凝固的各种Al-Si成分。我们的大部分研究都集中在使用实验室制造的Al-2Nb-2B母合金获得尽可能细的晶粒尺寸上。这项工作介绍了从早期开发阶段到第一次中试规模试验的结果、问题和进展。此外，本研究的结果进一步证明了选择Al-2Nb-2B标称成分的合理性，这主要是由于实验室规模下原料中Nb和B的产率/回收率较低。在本工作中，重点解决了考虑通过添加不同化学计量的Al-Nb-B中间合金孕育Al-10Si合金的Nb / B比影响的未解问题。(C) 2019作者。Elsevier B.V.出版
It has long been known that foundry Al-Si alloys cannot reliably and consistently be grain refined by means of Ti-containing master alloys due to reaction between Ti and Si. Over the last years we developed and studied new Nb-based grain refiners consistently demonstrating the effectiveness of Nb + B inoculation on foundry alloys studying various Al-Si compositions solidified under different cooling conditions. Most of our studies focused on achieving the finest possible grain size using a lab made Al-2Nb-2B master alloy. This work presents the results, issues, and advancements made from the early stages of development to the first pilot scale trial. Moreover, the results of the present study are a further justification of the choice of the Al-2Nb-2B nominal composition, which was primarily dictated by the poor yield/recovery of Nb and B from their raw materials at lab scale. In the present work, emphasis is put on addressing the unanswered question about the effect of Nb to B ratio considering the inoculation of an Al-10Si alloys via the addition of Al-Nb-B master alloys with different stoichiometries. (C) 2019 The Authors. Published by Elsevier B.V.