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Grain refining of Al-Si alloys using Al-10% Ti master alloy: role of Zr addition
International Journal of Cast Metals Research ( IF 1.4 ) Pub Date : 2018-09-14 , DOI: 10.1080/13640461.2018.1518662
A.M. Samuel 1 , S.S. Mohamed 1 , H.W. Doty 2 , S. Valtierra 3 , F.H. Samuel 1
Affiliation  

ABSTRACT The present study was carried out on ultra-pure aluminum, 1050, and 356 alloys. The results revealed that when Al-4%B is added to ultra-pure aluminum, it forms AlB12 and AlB2 which have no grain refining effect in pure aluminum. When no grain refiner is added to pure aluminum, the microstructure is a mixture of columnar and equiaxed grains. The addition of 30 ppm Ti to pure aluminum is sufficient to promote equiaxed grains when the metal is solidified at high rate ~ 10°C/s but requires an addition of 1000 ppm B at 0.8°C. Increasing the Si content to 7% reduces the initial grain size of pure aluminum from 2800 μm to 1200 μm. In commercial aluminum, B reacts with traces of Ti to form TiB2 phases which are active grain refining agents. However, in Al-7%Si, Ti reacts with Si forming (Al,Si)2Ti phase which is a poor refining agent.

中文翻译:

使用 Al-10% Ti 中间合金对 Al-Si 合金进行晶粒细化:添加 Zr 的作用

摘要 本研究是对超纯铝、1050 和 356 合金进行的。结果表明,在超纯铝中加入Al-4%B后,形成的AlB12和AlB2在纯铝中没有晶粒细化作用。当纯铝中不添加晶粒细化剂时,其显微组织是柱状和等轴晶的混合体。当金属以约 10°C/s 的高速凝固时,向纯铝中添加 30 ppm Ti 足以促进等轴晶粒,但在 0.8°C 时需要添加 1000 ppm B。将 Si 含量增加到 7% 可以将纯铝的初始晶粒尺寸从 2800 μm 减小到 1200 μm。在商用铝中,B 与痕量 Ti 反应形成 TiB2 相,这是活性晶粒细化剂。然而,在 Al-7%Si 中,Ti 与 Si 反应形成 (Al,Si)2Ti 相,这是一种不良的精炼剂。
更新日期:2018-09-14
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