Boron-based refiners: Implications in conventional casting of Al–Si alloys
Boron-based refiners: Implications in conventional casting of Al–Si alloys
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DOI：
10.1016/j.msea.2006.10.145
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发表时间：
2007-04
期刊：
影响因子：
6.4
通讯作者：
S. Nafisi;R. Ghomashchi
中科院分区：
文献类型：
--
作者：
S. Nafisi;R. Ghomashchi
研究了单纯添加硼作为孕育剂对A356合金常规铸造的影响。结果表明，少量硼的加入使冷却曲线上移，使再生完全消失。柱状枝晶结构转变为等轴晶结构。对于主要含有alb12颗粒的中间合金，提出了硼的溶解、中间合金中存在的alb2颗粒以及alb12向alb2的一定转变是强化细化的原因。为了阐明微量Ti在初生α-Al颗粒成核中的作用，提出了一个假设。
The effect of sole boron addition as inoculant has been studied in conventional casting of A356 alloy. It is shown that small addition of boron shifts up the cooling curve and makes the recalescence to disappear entirely. The columnar dendritic structure transforms to equiaxed morphology. For master alloys containing mainly AlB12particles, it is proposed the dissolved boron, the AlB2particles present in the master alloy, and some transformation of AlB12to AlB2are responsible for the enhanced refining. A hypothesis is proposed to clarify the role of the trace Ti on the nucleation of the primary α-Al particles.