Effects of Mn and Sn on microstructure of Al-7Si-Mg alloy modified by Sr and Al-5Ti-B

被引：18

作者：

Qiu, Ke ^{[1
]}

Wang, Ri-chu ^{[1
]}

Peng, Chao-qun ^{[1
]}

Wang, Nai-guang ^{[2
]}

Cai, Zhi-yong ^{[1
]}

Zhang, Chun ^{[1
]}

机构：

[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

[2] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2015年 / 25卷 / 11期

关键词：

Al-7Si-Mg aluminum alloy; grain refinement; intermetallic compound; manganese; tin; Al-5Ti-B; Sr; AL-SI ALLOYS; MECHANICAL-PROPERTIES; GRAIN-REFINEMENT; NUCLEATION MECHANISMS; TENSILE PROPERTIES; ALUMINUM-ALLOYS; HEAT-TREATMENT; TIN ADDITION; COOLING RATE; CAST ALLOYS;

D O I：

10.1016/S1003-6326(15)64075-4

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effects of Mn and Sn on the microstructure of Al-7Si-Mg alloy modified by Sr and Al-5Ti-B were studied. The results show that the columnar dendrites structure is observed with high content of Sr, indicating a poisoning effect of the Al-5Ti-B grain refinement. In addition, Sr intermetallic compounds distribute on the TiB2 particles, which agglomerate inside the eutectic Si. The mechanism responsible for such poisoning was discussed. The addition of Mn changes the morphology of iron intermetallic compounds from beta-Al5FeSi to alpha-Al(Mn,Fe)Si. Increasing the amount of Mn changes the morphology of alpha-Al(Mn,Fe)Si from branched shape to rod-like shape with branched distribution, and finally converts alpha-Al(Mn,Fe)Si to Chinese script shape. The microstructure observed by transmission electron microscopy (TEM) shows that Mg is more likely to interact with Sn in contrast with Si under the effect of Sn. Mg2Sn compound preferentially precipitates between the Si/Si interfaces and Al/Si interfaces.

引用

页码：3546 / 3552

页数：7

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