Work Hardening and Flow Softening of γ-TiAl Containing Ni
Artikel i vetenskaplig tidskrift, 2004

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 deg. C and 0.01-1.0 s-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.

work hardening

hot deformation

flow softening

TiAl alloys

Författare

Ji Zhang

Kenong Xia

Erik Ström

Chalmers, Institutionen för materialteknik

Zengyong Zhong

Changhai Li

Chalmers, Institutionen för materialteknik

Materials Science Forum

0255-5476 (ISSN)

Vol. 449-452 833-836

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

DOI

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