Solidification kinetics of a near eutectic Al-Si alloy, unmodified and modified with Sr

被引：15
|
作者：
Aparicio, R. [1 ]
Barrera, G. [2 ]
Trapaga, G. [1 ]
Ramirez-Argaez, M. [3 ]
Gonzalez-Rivera, C. [3 ]
机构：
[1] CINVESTAV Queretaro, Real De Juriquilla 76230, Queretaro Qro, Mexico
[2] UMSNH, Inst Invest Met, Morelia Mich 58000, Mexico
[3] Univ Nacl Autonoma Mexico, Fac Quim, Dept Met Engn, Mexico City 04510, DF, Mexico
来源：
METALS AND MATERIALS INTERNATIONAL | 2013年 / 19卷 / 04期
关键词：
alloys; solidification; grain growth; thermal analysis; Al-Si eutectic; ALUMINUM-SILICON ALLOYS; HEAT-TRANSFER; STRONTIUM; NUCLEATION; GROWTH;
D O I：
10.1007/s12540-013-4010-x
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The purpose of this work was to explore the differences in solidification kinetics between unmodified and Sr modified eutectic Al-Si alloy as revealed by Fourier Thermal Analysis (FTA) and grain-growth kinetics characterization. Thermal analysis were performed in cylindrical stainless steel cups coated with a thin layer of boron nitride, using two type-K thermocouples connected to a data acquisition system. Grain growth kinetics characterization was carried out using solid fraction evolution and grain density data. FTA results for the non modified and modified alloys suggest that there are changes in the solidification rate during eutectic nucleation followed, during growth, by similar solidification rate evolutions, suggesting that this parameter is governed principally by the heat extraction conditions. On the other hand the change of the grain growth parameters estimated for the experimental probes suggest that the presence of Sr may modify the relationship between grain growth rate and undercooling in eutectic Al-Si.
引用
收藏
页码：707 / 715
页数：9
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