Evolution of solidification structure, primary phase and wear properties of Sn-11wt%Sb alloy ingots under permanent magnet stirring
Evolution of solidification structure, primary phase and wear properties of Sn-11wt%Sb alloy ingots under permanent magnet stirring
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演化%20of%20凝固%20结构、%20初级%20相%20和%20磨损%20性能%20of%20Sn-11wt%Sb%20合金%20锭%20下%20永久%20磁铁%20搅拌
DOI：
10.1080/14786435.2021.1965238
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发表时间：
2021
影响因子：
1.6
通讯作者：
Alex McLean
中科院分区：
文献类型：
--
作者：
Wanlin Wang;Jianfei Peng;Jie Zeng;Chenyang Zhu;Yindong Yang;Alex McLean
研究了不同转速(0、60、120、180 rpm)下的永磁搅拌对锡-11wt%Sb合金凝固组织演变、初生相Sn4Sb_3及磨损性能的影响。结果表明，随着转速的提高，熔体的流动强度显著提高，晶粒和共晶组织得到改善，凝固空洞减少。此外，当转速从0增加到180rpm时，合金铸锭上、下部Sn4Sb3相的面积比例差异从17.05%减小到0.41%，初生相在纵向上分布更加均匀。当转速从0增加到180rpm时，合金铸锭上、下部Sn4Sb3相的面积比从17.05%减小到0.41%，初生相在纵向上分布更加均匀。 。此外，随着搅拌强度的提高，在靠近结晶器壁处的铸锭表面形成了一次富相层，初生相的平均当量直径增大。摩擦学测试结果表明，磁力搅拌可使合金的摩擦系数从0.77降至0.72，磨损面宽度从1.5 1 mm降至0.81 mm，增强初生相均匀分布，从而提高合金的耐磨性。
An experimental investigation has been conducted with respect to the influence of permanent magnet stirring (PMS) under different rotation speeds (0, 60, 120, 180 rpm) on the evolution of solidification structure, primary Sn4Sb3phase and wear properties of Sn–11wt%Sb alloy. The results revealed a significant increase in the flow intensity of the liquid, improvement in the grain and eutectic microstructure refinement, and decrease of solidification cavities with increasing rotation speed. Besides, when the rotation speed increased from 0 to 180 rpm, the difference in the area proportion of the Sn4Sb3phase between upper and lower parts of the alloy ingots decreased from 17.05% to 0.41%, resulting in a more uniformly distributed primary phase along the longitudinal direction. In addition, with enhanced stirring intensity, a primary phase-rich layer was formed at the surface of the ingot close to the mould wall, and the average equivalent diameters of the primary phase were increased. Moreover, tribological test results suggested that magnetic stirring could improve the wear resistance of the alloy by decreasing the friction coefficient from 0.77 to 0.72 and reducing the width of the worn surface from 1.51 to 0.81 mm due to the PMS-driven uniform distribution of the reinforcing primary phase.