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PARTICLE BOUNDARIES AND FRACTURE OF A POWDER METALLURGY SUPERALLOY

MAO Jian YANG Wanhong WANG Wuxiang ZOU Jinwen ZHOU Ruifa Beijing Institute of Aeronautical Materials , Beijing , China MAO Jian , senior engineer , Beijing Institute of Aeronautical Materials , Beijing 100095 , China

金属学报(英文版)

Nature of PPB precipitation of P/M Rene'95 and its effects on mechanical properties,frac- ture morphology and microfracture characteristics are discussed.Dense PPB precipitates make the boundaries brittle and lower the plasticity of the alloy.Fracture path is along the boundaries of particles.As PPB parameter increases,the interfaces between particles are strengthened.The fracture mode is changed from interparticle to transparticle.As a result,the plasticity at high temperatures and stress rupture life of the alloy are improved.

关键词: Rene'95 , null , null , null

SLIP SYSTEMS AND DISLOCATION DISTRIBUTION IN α-PHASE OF SUPERPLASTICALLY DEFORMED Ti-6AI-4V ALLOY

ZHAO Linruo ZHANG Shaoqing YAN Minggao Institute of Aeronautical Materials , Beijing , China Lab.No.4 , Beijing Institute of Aeronautical Materials , Beijing 100095 , China

金属学报(英文版)

The activated slip systems in the α-phase of the superplastically deformed Ti-6Al-4V alloy were analyzed by systematic operation method with TEM.The results show that the dominately activated slip systems in the α-phase are{01(?)0}〈2(?)0〉and{01(?)}2(?)0〉, The{0001}〈2(?)0〉system as well as the c+a dislocalions of b=[1/3]〈11(?)3〉will be acti- vated when the deformation temperature is lowered.Large amounts of TEM observations in- dicate that the dislocations in the α-phase were mainly activated near the triple grain bounda- ry junctions,α/α grain boundaries and α/β interlaces.

关键词: titanium alloy , null , null

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