HIGH TEMPERATURE STRENGTH AND AMBIENT DUCTILITY DEPENDENCES ON Al CONTENTS OF HIGH Nb CONTAINING TiAl ALLOYS

LI Haizhao; ZHANG Ji

doi:10.3724/SP.J.1037.2013.00499

Acta Metall Sin >

2013 , Vol. 49 >Issue 11: 1423 - 1427

DOI: https://doi.org/10.3724/SP.J.1037.2013.00499

HIGH TEMPERATURE STRENGTH AND AMBIENT DUCTILITY DEPENDENCES ON Al CONTENTS OF HIGH Nb CONTAINING TiAl ALLOYS

LI Haizhao ,
ZHANG Ji

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China Iron & Steel Research Institute Group, Beijing 100081

Received date: 2013-08-19

Revised date: 2013-09-11

Online published: 2013-11-11

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Abstract

The influences of Al contents on the high temperature strength and ambient ductility of cast high Nb containing TiAl alloys were investigated with 7%Nb (mole fraction) addition and Al contents varying from 46%－49%. The macro－ and micro－structures were examined. Due to the Nb solid solution strengthening effect, the cast alloy with lowest Al content consisting of a refined lamellar microstructure in equiaxed macro－grains exhibits excellent strength at 900℃ that is comparable with the well developed wrought alloys. The alloys with Al contents higher than 47% contains mostly or fully lamellar colonies with little orientation differences in macro－columnar crystals. Probably because of the lamellar structures with orientation hard to deform and the twining reinforcement, those alloys exhibit the more preponderant strength at 900℃ that can be as high as 595 MPa in the alloy with 47.5%Al. While, the effect of Al contents on ambient ductility becomes reversed as the Hard－to deform lamellar structures present very poor plastic elongation after tensile fractures.

Key words： cast high Nb containing TiAl alloy; high temperature strength; ambient ductility

Cite this article

LI Haizhao , ZHANG Ji . HIGH TEMPERATURE STRENGTH AND AMBIENT DUCTILITY DEPENDENCES ON Al CONTENTS OF HIGH Nb CONTAINING TiAl ALLOYS[J]. Acta Metall Sin, 2013 , 49(11) : 1423 -1427 . DOI: 10.3724/SP.J.1037.2013.00499

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