摘要
研究了定向凝固速率对Cu1.0wt%Cr亚共晶合金凝固界面形态及枝晶生长的影响。结果表明:当温度梯度一定时,随着凝固速率的提高,初生α相形态经过平面晶—胞晶组织—粗树枝晶—细树枝晶一系列的演化;初生α相的一次枝晶间距λ1在胞晶生长阶段逐渐增大,而在枝晶生长阶段,λ1又逐渐减小;而二次枝晶间距λ2随凝固速率的增加一直减小。
Effect of directional solidification rates on interface morphology and dendrite growth of the hypoeutectic Cu-1.0wt%Cr alloy was investigated.The results show that the interface morphology of α primary phase undergoes the evolution from plane front,cellular,thick dendrite to thin dendrite with increasing of solidification rates for a given temperature gradient.The first dendrite spacing λ_1 of primary α phase increases gradually during the cellular growth, and decreases during the dendrite growth.The second dendrite spacing λ_2 decreases with increase of the solidification rates.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2006年第1期33-35,共3页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金项目(50432020)
关键词
CU-CR合金
定向凝固
固液界面
枝晶
Cu-Cr alloy
directional solidification
S/L interface
dendrite growth
