材料期刊网

Effect of Long-term Thermal Exposure on Microstructure and Stress Rupture Properties of GH3535 Superalloy

T.Liu , J.S.Dong , L.Wang , Z.J.Li , X.T.Zhou , L.H.Lou , J.Zhang

材料科学技术（英文）

关键词:

HIGH-TEMPERATURE TENSILE FRACTURE BEHAVIOR OF DIRECTIONALLY SOLIDIFIED Ni, Cr, Al-TaC EUTECTIC SUPERALLOY

J.Zhang

金属学报(英文版)

The high-temperature tensile fracture behavior of the Ni, Cr, AI-TaC eutectic superalloy directionally solidified under high temperature gradient is investigated. The hightemperature tensile fracture of this in situ composite has ductile character with lots of ductile nests whose diameters decrease with the increasing solidification, rates. The maximum δb and δ are respectively 668.5MPa and 19.6％. There is a TaC whisker in the center of each nest, and the deformation of γ' and TaC is uneven. The hightemperature tensile behavior cannot be explained by the rule of mixtures but is decided by the formation of the plastic deformation band. The crack extension model is given.

关键词: Ni , null , null

Effect of Mo Addition on Microstructural Characteristics in a Re-containing Single Crystal Superalloy

X.G.Liu , L.Wang , L.H.Lou , J.Zhang

材料科学技术（英文）

关键词:

A COMPONENT-SPECIFIC ALLOY DESIGN OF TiAl INTERMETALLICS

J.Zhang , D.X. Zou , Z.Z. Zhang and Z. Y Zhong(Central Iron & Steel Research Institute , Beijing 100081 , China Manuscript received 26 August 1996)

金属学报(英文版)

The metallographic observation and analyses of TiAl alloy cast ingots revealed that the preferably arranged γ/α_2 lamellar microstructure can be obtained in columnar dendritic cast ingot through controlling the Ti/Al atomic ratio. The experiments conf irmed that the preferably arranged γ/α_2 lamellar microstructure has excellent tensile strength and fracture toughness and tolerant tensile plasticity when the stress is applied parallel to the γ/α_2 interface.Based on these results and the working condition of the turbine blades,a component-specific alloy design has been suggested.

关键词: : TiAl intermetallics , null , null

Cast Gamma TiAl with Self Oriented Lamellar Microstructure

J.Zhang , K.Xia

材料科学技术（英文）

Enhancing mechanical properties and improving reliability of TiAl alloys by utilizing the mechanical anisotropy of the cast lamellar structure were reported. A self-oriented lamellar (SOL) microstructure was successfully produced in shaped components. After modification by hot isostatic pressing, such a microstructure exhibited improved mechanical properties. The TiAl rotor blades with SOL in a turbocharger passed rotation rig tests and showed enhanced engine performance.

关键词: TiAl alloys , null , null