【摘 要】
：
The coarsening behavior of γparticles in a nickel-base superalloy FGH95 was investigated by means of experimental obser-vations and growth kinetics calculation
【机 构】
：
State Key Laboratory for Advanced Metals and Materials
【基金项目】
：
the Programme of Introducing Talents of Discipline to Chinese Universities;国家自然科学基金
论文部分内容阅读
The coarsening behavior of γparticles in a nickel-base superalloy FGH95 was investigated by means of experimental obser-vations and growth kinetics calculations. The results show that when aging at 1000, 1080 and 1140℃ for different times, the relation of average particle size to time obeys the cube law (a-/2)3 =kt, where.k is 15.49×103, 77.5×103 arid 230.04×103 nm3/min, respectively. The particle size distributions are better fit to the LSW theoretical distributions when aging at 1000℃ within 1440 min. The activation energy for γ particles coarsening is determined to be 288.20±1.79 kJ/mol, which correlates well to the diffusion activation energies of Al, Ti, and Nb in the nickel matrix. This indicates that the coarsening of γ particles is controlled by the diffusion of Al, Ti, and Nb in the nickel matrix. The coarsening kinetics of γparticles in FGH95 is pre-dicted as rt3 = 1.04×1016texp[-(288200±1790)/RT].
其他文献
Ti-Mo getters have been fabricated via metal injection molding (MIM) using three kinds of Ti powders with different mean particle sizes of 46 μm, 35 μm and 26
La3+ was selected to elevate the lattice electronic conductivity of LiFePO4, and LiFePO4/(C+La3+) cathode powders were synthesized by microwave heating using a
A new distributed fusion method of radar/infrared (IR) tracking system based on separation and combination of the measurements is proposed by analyzing the infl
Residual stresses of coated diamond grits were analyzed by a finite element unit cell model.Diamond grits coated with four types of metals, W, Mo, Ti, and Cr, w
This article investigates the problem of robust H∞ controller design for sampled-data systems with time-varying norm-bounded parameter uncertainties in the sta
To detect higher order polynomial phase signals (HOPPSs), the smoothed-pseudo polynomial Wigner-Ville distribution (SP-PWVD), an improved version of the polynom
The generalized thermo-elasticity theory, i.e., Green and Naghdi (G-N) III theory, with energy dissipation (TEWED) is employed in the study of time-harmonic pla
The mechanical properties (σb, σ0.2, and δ) and fracture behavior of tensile specimens of the refined A356 alloys were investigated as a func-tion of the add
提出并计算了基于单个客户的广义客户终身价值和挽救费用上限.在此基础上,提出了有挽救总经费约束条件下、为实现全体流失客户终身价值最大化的挽救模型,包括流失客户是否挽
Multiwalled carbon nanotubes (MWNTs) were treated with the reflux within the concentrated nitric acid for 0-25 h to purify and disperse the tangled MWNTs. The e