摘要
研究了不同Ru含量(质量分数,0%和2%)的高Re镍基单晶高温合金在1120℃/140 MPa条件下的蠕变性能,采用SEM、STEM/TEM以及EDS等方法分析了Ru对合金γ/γ′相组织、合金元素成分分配比、蠕变变形组织和位错形态的影响。结果表明,与无Ru合金相比,含Ru合金γ′尺寸更为细小,γ相通道更窄,γ/γ′两相中对TCP相析出有重要影响的Re、Mo和Cr元素分配更加均匀。Ru通过减小γ′相尺寸和γ相通道宽度,降低γ/γ′界面平均位错间距,抑制蠕变加载过程中TCP相析出,显著提高合金的高温蠕变性能。
The influence of Ru element on the creep properties of high Re Ni-based single crystal superalloys with two levels of Ru（0 wt%,2wt%） additions under 1120℃/140 MPa was investigated.The γ/γ′ phase,partitioning ratio of alloying elements,deformation microstructures and the morphology of dislocations were studied by SEM,STEM/TEM and EDS.The results indicate that Ru addition results in uniform elemental partitioning ratio of Re,Mo and Cr which are important for the precipitation of TCP phase.In addition,Ru addition decreases the size of γ′ phase and width of γ channel,reduces the spacing of γ/γ′ interfacial dislocation networks and inhibits the precipitation of TCP phase in the process of creep loading,finally improving the creep properties of the investigated alloy significantly.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第7期1719-1725,共7页
Rare Metal Materials and Engineering
关键词
单晶高温合金
RU
显微组织
γ/γ′相相成分分配
蠕变性能
single crystal superalloys
Ru
microstructures
partitioning of elements in γ/γ′ phase
creep properties
