Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第24卷    第1期    总第178期    2014年1月

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文章编号:1004-0609(2014)01-0069-06
受控扩散凝固制备过共晶Al-Si合金及其热力学分析
胡韶华1,李元东1, 2,何明涛1,索江龙1,马 颖1, 2

(1. 兰州理工大学 甘肃省有色金属新材料省部共建国家重点实验室,兰州 730050;
2. 兰州理工大学 有色金属合金省部共建教育部重点实验室,兰州 730050
)

摘 要: 采用液-液混合受控扩散凝固技术(CDS)制备过共晶Al-20%Si合金,研究高硅合金温度对目标合金组织中初生硅的影响及混合过程中初生硅细化的热力学条件。结果表明:采用液-液混合制备过共晶铝硅合金,可以细化初生硅,初生硅平均尺寸可达到37 μm;但随着高硅合金温度的升高,初生硅的平均尺寸增加,板条状和五瓣星状初生硅也增多,当高硅温度超过790 ℃时,初生硅细化效果丧失。分析得出,只有当混合前两种合金吉布斯自由能的加权平均值小于混合后目标合金在液相线的吉布斯自由能( =-39.336 6 kJ)时,初生硅才能得到明显的细化。

 

关键词: 过共晶Al-Si合金;液-液混合;受控扩散凝固(CDS);初生硅相;热力学

Hypereutectic Al-Si alloy prepared by controlled diffusion solidification and its thermodynamic analysis
HU Shao-hua1, LI Yuan-dong1, 2, HE Ming-tao1, SUO Jiang-long1, MA Ying1, 2

1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,
Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Non-ferrous Metal Alloys, Ministry of Education,
Lanzhou University of Technology, Lanzhou 730050, China

Abstract:The hypereutectic Al-20%Si alloy was fabricated by liquid-liquid mixing of controlled diffusion solidification (CDS), and the effect of temperature of high silicon alloy on the microstructure of primary silicon phase and thermodynamic condition of primary silicon refinement in the mixing process were studied. The results show that the primary silicon can be refined obviously and the size of the primary silicon can reach 37 μm in the preparation of hypereutectic Al-20%Si alloy fabricated by liquid-liquid mixing. When the temperature of high silicon alloy increases, the primary phase size increases. When the high silicon temperature is over 790 ℃, the refinement effect of primary silicon is lost. Additionally, when the Gibbs free energy of the liquids prior to mixing is less than the Gibbs free energy of the resultant liquid at its liquidus temperature ( =-39.336 6 kJ), the primary silicon phase will be refined obviously.

 

Key words: hypereutectic Al-Si alloy; liquid-liquid mixing; controlled diffusion solidification (CDS); primary silicon; thermodynamic

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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