D.G. Ren
,
Z.Q. Li
,
X.S. Fan and J. T. Guo Laboratory of Atomic Imaging of Solids
,
Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China
金属学报(英文版)
By using AP-FIM the varity of the ordered degree of Ni_3Al with L1_2 structure with B content was studied. The possibility of boron improving ductility was also discussed from bonding between Ni and Al atoms, and antisite defects in Ni_3Al. The extent of ordering is reduced with an increase in boron content and the autisite defects are most obvious for 0.52at.K B-doped sample that has the best ductility. Some results were verified by X-ray diffraction non. The addition of boron not only influences electron environment at grain boundary but also in the interior of Ni_3Al gm ins, the latter is favorable to improve the ductility of Ni_3Al grains.
关键词:
intermetallic compound
,
null
,
null
J.W. Zhao
,
H. Ding
,
W.J.Zhao
,
F.R. Cao
,
H.L. Hou
,
Z.Q. Li
金属学报(英文版)
A cellular automaton (CA) model is established to
simulate dynamic recrystallization (DRX) in the $\beta$ single-phase
field of Ti6Al4V alloy, and the kinetics during DRX processing has
been analyzed. The model employed considers the influences of
dynamic recovery, nucleation rate, strain rate and dislocation
density on DRX, and practical deformation parameters, such as
temperature, strain and strain rate on DRX have been considered in
the simulation. The simulated DRX grain size and DRX grain shape
agree well with the experimental results, which shows the
availability and feasibility of the cellular automaton method for
the simulation of DRX. The result of kinetics analysis of DRX
reveals that the Avrami exponent is variable ranging from 2.4 to
2.9, which increases with the increase of strain rate.
关键词:
Ti6Al4V alloy
,
null
,
null
,
null
,
null
,
null
