Grain Growth Law of Semi-solid State TiCp/7075 Al Alloy Prepared by Spray Deposition

Acta Metall Sin

2006, Vol. 42

Issue (2): 158-162 DOI:

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Grain Growth Law of Semi-solid State TiCp/7075 Al Alloy Prepared by Spray Deposition

LIU Huimin

内蒙古工业大学材料科学与工程学院

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LIU Huimin. Grain Growth Law of Semi-solid State TiCp/7075 Al Alloy Prepared by Spray Deposition. Acta Metall Sin, 2006, 42(2): 158-162 .

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Abstract The grain growth behavior in reactive spray formed TiCP/7075 Al alloy was studied and compared with that of spray formed 7075 Al alloy at semi-solid state. The specimens were heat-treated isothermally at 600℃ for times in the range of 10-60min,then quenched in water. The microstructure of reheated specimens was characterized using OP、SEM and TEM. The grain size was measured using a mean linear intercept method. Results shows that the in-situ TiC particles can effectively retard grain growth, grain growth exponent (n) for Arrhenius equation was increased from 2 to 3, which indicates that the in-situ TiC particles have the significant pinning effect on grain coarsening in the semi-solid state. The analysis also showed that the activation energy for grain growth for the samples with TiC addition was over twice of that for the samples without TiC additions, which made it more difficult for grain.

Key words: semi-solid state reheating spray formed TiCP/7075 Al alloy grain growth

Received: 13 May 2005

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TG146.21

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I2/158

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