摘要
研究了Al-1%Si合金在保温条件下超声波处理对其凝固组织的影响,考察了不同保温温度、不同处理时间及不同冷却方式条件下Al-1%Si合金凝固组织的变化规律。试验表明:在不同保温温度条件下,当保温温度较高时,超声波处理熔体的晶粒细化效果不明显,晶粒粗大;随着保温温度的下降,铸锭中等轴晶的数量先呈递增趋势;当在两相区内进行超声波处理时,晶粒细化效果降低,等轴晶数量明显减少,可以认为存在一个适当的超声波处理温度。此外,坩埚材质和冷却方式对保温处理后熔体凝固组织有很大的影响。
The Al- 1% Si alloy was researched under the condition of holding temperature in the melt. The effect of ultrasonic on Al-1 % Si alloy microstructure was investigated under the conditions of different treatment and different time and different cooling methods. Furthemlore, the change of the alloy solidified structure was discussed. The following conclusions are obtained： in conditions of different holding temperatm＇e, when the holding temperature is higher, the grain refinement effect by the ultrasonic treatment is not obvions, and its was coarse;with the decrease of holding temperature, the equiaxed grain in the ingot increases at first and then decreases. When ultrasonic treatment carries out in the two-phase region, the effectiveness of grain refinement reduces, the number of equiaxed grain decreased significantly. It considered there exist a suitable holding temperature range of ultrasound treatment. When the holding temperature is in the range of 684℃ - 654℃, the treatment effect is best. In addition, the material of crucible and the method of cooling also have great effect on solidified structure by ultrasonic. In these ingots, the melt by ultrasonic treatment is peured into the metal mold and the best refinement effect is obtained, and the smaller equiaxed uniform regular distributed throughout the section of the ingot.
出处
《轻合金加工技术》
CAS
北大核心
2009年第1期26-29,53,共5页
Light Alloy Fabrication Technology
基金
教育部留学回国人员科研启动基金资助项目
辽宁省自然科学基金资助项目(编号200821777)
辽宁工业大学材料物理与化学重点学科研究基金资助(LG200705)
