摘要
研究了一种新型镍基单晶高温合金长期时效过程中γ′相形貌的变化。结果表明，在950、1000、1050℃下时效o～1500h时，γ′相形态从最初的立方体形貌逐渐演化形成了不规则的条形、L形、迷宫形等。时效过程中，枝晶间／相的粗化速率明显高于枝晶干处的粗化速率。随时效温度地提高，γ′相的粗化速率加快。枝晶干处与枝晶间区域γ/γ′相界面共格应变能的差异是枝晶间与枝晶干区域y’相粗化程度存在差异的主要原因。枝晶干处γ′相的粗化激活能与枝晶间处γ′相的粗化激活能分别为451kJ·mol-1和345kJ·mo1-1。
Morphology evolution of yP phase was investigated in a new nickel based single crystal during long-term aging. The results show that at 950,1 000 and 1 050℃, the phase morphology is evolved gradually into irregular strip shape, L shape and maze shape from initial cubical structure. The coarse- ning rate of phase in the interdendrite area is remarkably higher than that one in dendrite area. The coarsening rate is accelerated with aging temperature increase. The interracial energy of y/Ft phase and the reduce of elastic strain energy are responsible for the phase coarsening and coarsening rate difference between the interdendrite and dendrite. The coarsening activation energy for phase in the interdendrite area and in dendrite area reach 345 kJ·mol-1and451kJ·mo1-1 respectively.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2014年第7期673-675,共3页
Special Casting & Nonferrous Alloys
基金
辽宁省自然科学基金资助项目(2008222011)
关键词
镍基单晶高温合金
时效
粗化行为
形貌
Nickel Based Single Crystal Alloy, Aging, Coarsening Behavior, Morphology
