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Structural Dependence of Creep/Fatigue Behaviour of Single Crystal Ni-base Superalloy

J. Zrnik and M.Hazlinger(Faculty of Metallurgy , Technical University , Kosice , Slovakia)M.Zitnansky(Material- Technological Faculty , Trnava , STU Bratislava , Slovakia)Zhongguang WANG(State Key Labratory for Faigue and Fracture of Materials , Institute of Meta

材料科学技术（英文）

The effect of different initial microstructures deftned by γ' precipitate morphology has been investigated at the creep/fatigue conditions of 900℃ and 500 MPa. The wave form of stress as a function of time for cyclic load was of trapezoidal shape with a hold time of 10s at the upper stress level. The TEM was employed to examine the deformation process in strengthened γ' matrix in dependence of γ' precipitate morphology. The fracture lifetime and cycle number up to fracture were the criteria to evaluate the additional cyclic component efFect on the course of deformation

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Studies of Structure Evolution of Nanostructured Hf_(11)Ni_(89) Alloy

Zhenfu DONG and Lianmao PENG(Beijing Lab. of Electron Microscopy , Institute of Physics and Center for Condensed Matter Physics , Chinese Academy of Sciences , P.O.Box 2724 , Beijing 100080 , China)Ke LU and Zhuangqi HU(State Key Lab. for RSA , Institute of Meta

材料科学技术（英文）

A nanostructured Hf11Ni89 ribbon sample was prepared by melt-spinning. It was found that the as-quenched sample is composed of a major HfNi5 compound nanophase and an interfacial magnetic Ni(Hf) solid solution phase. The structure evolution of the sample was studied by using X-ray difFraction (XRD), transmission electron microscopy (TEM), difFerential scanning calorimetry (DSC), resistivity and magnetothermal analysis. Upon heating, a second precipitation process of the Ni(Hf) phase prior to grain growth wa5 detected by means of both structural analysis and physical property measurements. The measurement results are discussed based on the relationship between microstructure and physical properties.

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