An improved practice to manufacture Al–Ti–B master alloys by reacting halide salts with molten aluminium
An improved practice to manufacture Al–Ti–B master alloys by reacting halide salts with molten aluminium
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DOI：
10.1016/j.jallcom.2005.10.017
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发表时间：
2006-08
影响因子：
6.2
通讯作者：
Y. Birol
中科院分区：
文献类型：
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作者：
Y. Birol
本工作采用成熟的“卤化物盐”路线制备具有一致、良好性能的Al-Ti-B晶粒细化剂合金。然而，对生产周期中的保持步骤进行了修改，以避免熔融合金的氧化，这被认为是造成相对低的Ti回收率并因此造成晶粒细化效率不充分和不一致的原因。当熔融的氟化铝钾盐留在熔融合金上以避免过度氧化时，发现在保持期间的搅拌降低了晶粒细化性能。同样，高于800°C的保持温度和长于30分钟的保持时间都对晶粒细化性能具有不期望的影响。根据本发明方法生产的实验Al-5 Ti-1B晶粒细化剂合金提供了一致的和更好的总体晶粒细化性能。
The well-established “halide salt” route was employed in the present work to produce Al–Ti–B grain refiner alloys with consistent, good properties. The holding step in the production cycle was revised, however, to avoid oxidation of the molten alloy which is believed to be responsible for the relatively low Ti recoveries and thus for the inadequate and inconsistent grain refining efficiency. Stirring during holding was found to degrade the grain refining properties when molten potassium aluminium fluride salt was left on the molten alloy to avoid excessive oxidation. Likewise, holding temperatures higher than 800°C and holding times longer than 30min both had an undesirable effect on the grain refining performance. The experimental Al–5Ti–1B grain refiner alloy produced according to the present method provided consistent and better overall grain refining performance.