Work Hardening and Flow Softening of γ-TiAl Containing Ni

Jian Hui Zhang; Kenong Xia; Erik Strom; Zeng Yong Zhong; Chang Hai Li

doi:10.4028/www.scientific.net/MSF.449-452.833

Paper Titles

High Temperature Oxidation Mechanism of TiAl-W-Si Alloys
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Oxidation of (Al+12.5%Cu)₃Zr Intermetallics Synthesized by Mechanical Alloying
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Oxidation of (Al+8%Mn)₃Ti Intermetallics Synthesized by Mechanical Alloying
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High Temperature Deformation Behavior of a Ti-45.5Al-2Cr-4Nb-0.4B Intermetallic Compound
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Work Hardening and Flow Softening of γ-TiAl Containing Ni
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Deformation Behaviors of Nb Doped Gamma Titanium Aluminides
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Yield Stress Anomalous Behavior in β-CuZn Alloy
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Tensile Properties of MoSi₂ at Elevated Temperatures
p.845

Fatigue and Contact Damage of Layered Machinable Ti₃SiC₂ Ceramics
p.849

HomeMaterials Science ForumMaterials Science Forum Vols. 449-452Work Hardening and Flow Softening of γ-TiAl...

Work Hardening and Flow Softening of γ-TiAl Containing Ni

Abstract:

This paper presents the true stress - strain curves and data analyses of a Ni-containing TiAl and its reference alloy based on the isothermal compression tests at 1000°C and 0.01 - 1.0s^-1 strain rates. The results show that the minor Ni addition makes the flow softening coming sooner and therefore significantly lowers the peak stress. Those effects, in addition with a better balance between the work hardening and flow softening during hot deformation, improve the steady state flow behavior of TiAl. The Ni-influence mechanisms are also suggested based on the TEM observation of dislocation configurations and lamellar breakdown during the deformation.