Interactive effects of grain refinement, eutectic modification and solidification rate on tensile properties of Al-10Si alloy
Interactive effects of grain refinement, eutectic modification and solidification rate on tensile properties of Al-10Si alloy
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DOI：
10.1016/j.msea.2017.07.074
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发表时间：
2017-08
期刊：
影响因子：
6.4
通讯作者：
Martin Riestra;E. Ghassemali;T. Bogdanoff;S. Seifeddine
中科院分区：
文献类型：
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作者：
Martin Riestra;E. Ghassemali;T. Bogdanoff;S. Seifeddine
本研究旨在阐明晶粒尺寸和Si变质对Al-10 Si铸造合金在不同冷却速率下凝固的显微组织和拉伸性能的影响。为了复制冷却速率的效果，定向凝固样品通过重熔铸态圆柱形棒来生产。拉伸性能，晶粒尺寸，硅改性水平和化学成分的档案进行了评价。结果表明，快速冷却速度单独，没有添加晶粒细化剂（Al-5 Ti-1B中间合金），没有导致等轴晶形态。另一方面，对于测试的最慢冷却速率，Al-5 Ti-1B和Al-10 Sr中间合金的组合添加导致等轴晶粒结构，而仅添加晶粒细化剂导致柱状晶粒。组合添加剂在所有测试的冷却速率下有效地产生等轴晶粒组织，并进一步改善拉伸性能。
This study aims to clarify the effect of grain size and Si modification on the microstructure and tensile properties of the Al-10Si cast alloy, solidified under various cooling rates. To replicate the effect of cooling rate, directionally solidified samples were produced by remelting of the as-cast cylindrical bars. Tensile properties, grain sizes, Si modification level and chemical composition profiles were evaluated. Results showed that fast cooling rates alone, without the addition of grain refiners (Al-5Ti-1B master alloy), did not lead to equiaxed grain morphologies. On the other hand, for the slowest cooling rate tested, combined additions of the Al-5Ti-1B and the Al-10Sr master alloys resulted in equiaxed grain structures while addition of only grain refiner resulted in columnar grains. The combined additions effectively produced an equiaxed grain structure at all cooling rates tested, and further improved the tensile properties.