镍基单晶高温合金中的类树枝晶γ′相晶体生长  

PSEUDO-DENDRITE GROWTH CHARACTERISTICS OF THE γ' PRECIPITATES IN A SINGLE CRYSTAL NICKEL BASE SUPERALLOY

作　　者：张静华[1] 姚向东[1] 张志亚[1] 李英敖[1] 管恒荣[1] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所

出　　处：《材料研究学报》1994年第5期406-408,共3页Chinese Journal of Materials Research

基　　金：国家自然科学基金

摘　　要：在镍基单晶高温合金中。An investigation has been made of the nucleation and growth characteristics of the pseudo-dendritic γ' precipitates in a single crystal nickel base superalloy which is directly aged after homogenezing and solutioning at high temperature. The results show that the temperature for the pseudodendritic γ' precipitation is sensitive to the alloy composition in local area and that the relationship between the nucleation density I and undercooling △ Tγ' for the pseudo-dendritic γ' precipitation appears to be logarithmic which can be described in terms of a simulation equation: I= 2.5 × 10-3exp(0.11△Tγ'). The size of the pseudo-dendritic γ' precipitates is proportional to the direct aging time under small undercooling. The preferential growth direction of the pseudo-dendrite γ' precipitates is < 110 >.

关 键 词：类树枝晶 单晶高温合金 镍合金 

分 类 号：TG146.15[一般工业技术—材料科学与工程]