硼对Ni_3Al基IC6合金凝固过程影响的研究  

Study of effect of boron content on solidification process of IC6 alloys

作　　者：汪小平[1] 郑运荣[1] 肖程波[1] 王蓓蕾 韩雅芳 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2000年第2期21-27,共7页Journal of Aeronautical Materials

摘　　要：以等温凝固试验为基本手段 ,研究了四种不同 B含量 ( wt% ) (无 B,0 .0 2 B,0 .0 4 B,0 .0 7B)IC6合金的凝固行为 ,明确了 B含量对 IC6合金凝固过程的影响。研究结果表明 ,B含量对合金液相线、次生γ′的析出次序与析出温度影响不大 ,但能使合金固相线显著下降 (从而使合金的凝固范围变宽 ) ;同时 ,B含量的增加还促进了合金中低熔点相 M3B2 的析出并使合金枝晶间的液池在很宽的温度范围内保持连通。此外 ,经等温凝固分析 ,高硼 ( 0 .0 7wt% ) IC6合金理论上具有最佳可铸性。Solidification behaviors of four IC6 alloys of different boron content ( 0B, 0.02 B,0.04B,0.07B, wt%) were studied using isothermal solidification method, the volume percent of solid and liquid of four alloys at different temperatures in the range between solidus and liquidus was measured and the effects of boron content on the solidification processes and castability of IC6 alloys were determined .The results show that there is no obviously effect of boron content on the liquidus and the precipitation of secondary γ′ phase of IC6 alloys, but the addition of boron will lower the solidus significantly ( thus widen the range between solidus and liquidus ) and will promote the formation of low melting point phase M 3B 2. Moreover, B addition would make liquidus of interdendrite zones inter linked each other in a very wide range of temperature. The best castability is achieved in alloy 4 # (0.07wt% B) by theoretical prediction.

关 键 词：凝固过程 液池 显微组织 可铸性 B含量 IC6含量 

分 类 号：TG132.3[一般工业技术—材料科学与工程]