Effect of melt purification treatment on the solidified microstructure of hypereutectic Al-Si alloys

被引：7

作者：

Zhu, Z. ^{[1
,2
]}

Wang, J. H. ^{[1
,2
,3
]}

Liu, Y. ^{[1
,2
]}

Wu, C. J. ^{[1
,2
]}

Tu, H. ^{[1
,2
]}

Su, X. P. ^{[1
,2
]}

机构：

[1] Changzhou Univ, Jiangsu Key Lab Mat Surface Sci & Technol, Changzhou 213164, Peoples R China

[2] Changzhou Univ, Jiangsu Collaborat Innovat Ctr Photovolta Sci & En, Changzhou 213164, Peoples R China

[3] Changzhou Univ, Sch Mat Sci & Engn, Changzhou 213164, Peoples R China

来源：

MATERIALS TODAY COMMUNICATIONS | 2023年 / 35卷

基金：

中国国家自然科学基金;

关键词：

Melt purification; Composite Na salt; Deep undercooling of melt; NaAlSi; Nanoscale spherical precipitates; MECHANICAL-PROPERTIES; PRIMARY SILICON; THERMAL PARAMETERS; NUCLEATION; MORPHOLOGY; BEHAVIOR; PHASE; WEAR; SR;

D O I：

10.1016/j.mtcomm.2023.106000

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, hypereutectic Al-Si alloys were purified by a composite sodium salt, and the solidified microstructure of hypereutectic Al-Si alloys before and after melt purification was studied by OM, SEM/EDS, XRD, and TEM. The results showed that the Fe content decreased from 0.73 wt% to 0.23 wt% after purification with the Na salt. This also prevented an increase in heterogeneous nucleation. The Si content remained almost unchanged, which excluded the possibility of removing Si from the molten Na salt. According to DSC analysis, Na salt purification increased the undercooling degree of the melt, so that the hypereutectic Al-Si alloy melt was deeply undercooled to the pseudo eutectic region, and a nearly-perfect pseudo eutectic structure was obtained. Moreover, it was confirmed that NaAlSi changed the growth of eutectic Si, thereby changing its microstructure. At the same time, nanoscale spherical precipitates formed by trace Fe in the alloy could significantly promote the nucleation of eutectic Si.

引用

页数：8

共 34 条

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