MICROSTRUCTURE EVOLUTION OF TI-48AL-XNB GAMMA-INTERMETALLICS

被引：32

作者：

LI, YG

LORETTO, MH

机构：

[1] IRC in Materials for High Performance Applications, The University of Birmingham, Edgbaston, Birmingham

来源：

ACTA METALLURGICA ET MATERIALIA | 1994年 / 42卷 / 06期

关键词：

D O I：

10.1016/0956-7151(94)90025-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructures of Ti-48Al alloys containing either 2 at.% or 8 at.% Nb have been studied in as-cast, as-HIPped and in heat-treated samples. The as-cast Ti-48Al-2Nb and Ti-48Al-8Nb are heterogeneous and lower Nb content has been detected in the interdentritic gamma by EDX analysis. Depending on the heat-treatment temperature and cooling rate, the microstructure obtained vary from martensitic structure in the water quenched samples to duplex structure consisting of gamma grains and lamellar alpha2/gamma and to fully lamellar structure in the furnace cooled samples. Nb was found to have a high solubility in both alpha and gamma phases and to expand the gamma phase region so that a fully gamma structure is obtained in the Ti-48Al-8Nb sample by annealing at 1200-degrees-C. A dense array of planar defects (antiphase boundaries, stacking faults and microtwins) was obtained in the Ti-48Al-8Nb alloy water quenched from 1400-degrees-C.

引用

页码：2009 / 2017

页数：9

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