Grain refinement and tensile properties improvement of aluminum foundry alloys by inoculation with Al-B master alloy
Grain refinement and tensile properties improvement of aluminum foundry alloys by inoculation with Al-B master alloy
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DOI：
10.1016/j.msea.2012.05.088
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发表时间：
2012-09-15
期刊：
影响因子：
6.4
通讯作者：
Li, Tingju
中科院分区：
文献类型：
--
作者：
Chen, Zongning;Wang, Tongmin;Li, Tingju
定量研究了Al-Zn、Al-Cu、Al-Mg和Al-Si二元系对Al-B中间合金孕育的晶粒细化效应。在0.01体积%的添加水平下AlB_2、Al-B中间合金对Al-Si合金的细化效果较好，但对前三者的细化效果不佳。这不能用低共熔反应机制来解释，而在最近的研究中，低共熔反应机制似乎是非常合理的。溶质范式的进一步研究为铝硼中间合金孕育晶粒细化机理提供了新的认识。结果表明，当铝熔体中存在溶质Si时，AlB2颗粒的细化能力得到增强。在此基础上，研究了Al-B中间合金对AlSi7Mg、AlCu8Si和AlZn5Mg铸造合金晶粒细化的潜力。拉伸性能的测试显示出与前述晶粒细化研究的良好一致性。Al-B中间合金对AlSi7Mg合金有较强的细化作用，对AlCu8Si合金只有在加入后不久进行铸造时才能起到细化作用。然而，对于AlZn5Mg合金，Al-B中间合金不能提供与含有高含量Si的铝合金的情况一样的足够的晶粒细化。(C)2012 Elsevier B.V.保留所有权利。
The grain refining responses of Al-Zn, Al-Cu, Al-Mg and Al-Si binary systems to inoculation of Al-B master alloy were investigated quantitatively. At an addition level of 0.01 vol.% AlB2, Al-B master alloy failed to serve as an efficient grain refiner in refining the former three despite its preferred performance in refining Al-Si alloys. This cannot be explained by the eutectic reaction mechanism, which seems to be very plausible in recent studies. Further study in the viewpoint of solute paradigm provides an alternative understanding of the grain refinement mechanism by inoculation with Al-B master alloy. It appears that the refining potency of AlB2 particles could be enhanced when solute Si is present in the aluminum melt. The potential of Al-B master alloy in the grain refinement of AlSi7Mg, AlCu8Si and AlZn5Mg foundry alloys was investigated based on this finding. Tests of tensile properties have shown good agreement with the foregoing grain refinement studies. Al-B master alloy can be used as powerful grain refiner for AlSi7Mg alloy, and for AlCu8Si alloy only when casting is made shortly after grain refiner addition. For AlZn5Mg alloy, however, Al-B master alloy does not supply sufficient grain refinement as the case for aluminum alloys containing high contents of Si. (C) 2012 Elsevier B.V. All rights reserved.