摘要
研究了低压脉冲电流作用下Al-4·5Cu合金凝固组织的变化,考察了冷却速度、脉冲电压和处理时间对合金晶粒大小的影响。试验结果表明:在低压脉冲电流的作用下,Al-4·5Cu合金的凝固组织显著细化,其初生相由发达的树枝晶转变为均匀细小的蔷薇状晶体。合金的晶粒尺寸随着冷却速度的增加而逐渐减小。随着脉冲电压的提高,合金的晶粒尺寸逐渐减小;当脉冲电压达到400V时,晶粒尺寸略有回弹。随着处理时间的增加,合金的晶粒尺寸逐渐减小;当处理时间大于10min时,晶粒尺寸随着处理时间的增加而略有增大。
The influence of low-voltage electric current pulse (LVECP) on solidified structure of Al-4.5Cu alloy was studied, and the effects of cooling rate, pulse voltage and treating time on grain size of the alloy were investigated. Experimental results indicate that the solidified structure of Al-4.5Cu alloy can be remarkably refined, where primary α-Mg phase is converted from developed dendrites into uniformly fine rosette grain after LVECP treatment. With cooling rate and pulse voltage increase, the grain size of Al-4.5Cu can be reduced gradually. However, with the pulse voltage increasing to 400V, grain size in the Al-4.5Cu alloy can be increased slightly. As treating time increasing from 0 to 10 min, the grain size can be decreased greatly, while the treating time is more than 10 min, grain size in Al-4.5 Cu alloy can be somewhat increased with increasing in treating time.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2006年第11期693-695,共3页
Special Casting & Nonferrous Alloys
