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@ARTICLE{Schloffer:224461,
author = {Schloffer, Martin and Rashkova, Boryana and Schöberl,
Thomas and Schwaighofer, Emanuel and Zhang, Zaoli and
Clemens, Helmut and Mayer, Svea},
title = {{E}volution of the $\omega$${_o}$ phase in a
$\beta$-stabilized multi-phase {T}i{A}l alloy and its effect
on hardness},
journal = {Acta materialia},
volume = {64},
issn = {1359-6454},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {PUBDB-2015-03594},
pages = {241 - 252},
year = {2014},
abstract = {The intermetallic b-stabilized
Ti–43.5Al–4Nb–1Mo–0.1B alloy (in $at.\%),$ termed
TNM alloy, is designed to be used at elevated
temperatures,typically up to 750 C. To understand the
evolution of the microstructures during heat treatments and
subsequent creep tests,an understanding of the phase
transformations and decomposition reactions that occur is
necessary. The present study deals with thedevelopment and
growth mechanism of the ω${_o}$ phase, which forms in the
b${_o}$ phase during static annealing treatments and creep
testsperformed at 750, 780 and 800 C using an applied stress
of 150 MPa. In situ high-energy X-ray diffraction
experiments were conducted to investigate the decomposition
behaviour of the ω${_o}$ phase during heating as well as to
determine its dissolution temperature.
Highresolutiontransmission electron microscopy was used to
study the coarsening of xo grains during creep. The chemical
compositionof b${_o}$ and ω${_o}$ was determined by means
of energy dispersive X-ray microanalysis. In particular, the
impact of the Mo content on thegrowth of the ω${_o}$ grains
within the b${_o}$ matrix was investigated. Additionally,
nanohardness measurements in c, a${_2}$, b${_o}$ and
(b${_o}$ + ω${_o}$) grainswere performed by cube corner
indentation. The results show that b${_o}$ is the hardest
phase in the TiAl–Nb–Mo alloy system when
finelydispersed xo precipitates are present.},
cin = {HZG},
ddc = {670},
cid = {I:(DE-H253)HZG-20120731},
pnm = {6G3 - PETRA III (POF3-622) / PETRA Beamline P07
(POF2-54G14) / ELISA - European Light Sources Activities -
Synchrotrons and Free Electron Lasers (226716)},
pid = {G:(DE-HGF)POF3-6G3 / G:(DE-H253)POF2-P07-20130405 /
G:(EU-Grant)226716},
experiment = {EXP:(DE-H253)P-P07-20150101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000331017800024},
doi = {10.1016/j.actamat.2013.10.036},
url = {https://bib-pubdb1.desy.de/record/224461},
}