采用原位反应喷射沉积法制备TiCp/7075半固态铝合金坯料,在600℃保温10-60 min, 研究半固态二次加热过程中合金的晶粒长大规律, 并与喷射沉积7075铝合金进行对比分析. 结果表明, 添加原位TiC颗粒后, 合金的晶粒长大指数由2增加到3, 晶粒长大速率明显减慢. 其原因是添加TiC颗粒后合金晶粒长大激活能增加1倍左右, 使得合金的晶粒长大更加困难, 显示出原位TiC颗粒对喷射沉积7075铝合金的晶粒长大具有显著的抑制作用.
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.
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