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000224461 1001_ $$0P:(DE-H253)PIP1010525$$aSchloffer, Martin$$b0
000224461 245__ $$aEvolution of the $\omega$${_o}$ phase in a $\beta$-stabilized multi-phase TiAl alloy and its effect on hardness
000224461 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2014
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000224461 520__ $$aThe intermetallic b-stabilized Ti–43.5Al–4Nb–1Mo–0.1B alloy (in at.%), termed TNM alloy, is designed to be used at elevated temperatures,typically up to 750 C. To understand the evolution of the microstructures during heat treatments and subsequent creep tests,an understanding of the phase transformations and decomposition reactions that occur is necessary. The present study deals with thedevelopment and growth mechanism of the ω${_o}$ phase, which forms in the b${_o}$ phase during static annealing treatments and creep testsperformed at 750, 780 and 800 C using an applied stress of 150 MPa. In situ high-energy X-ray diffraction experiments were conducted to investigate the decomposition behaviour of the  ω${_o}$ phase during heating as well as to determine its dissolution temperature. Highresolutiontransmission electron microscopy was used to study the coarsening of xo grains during creep. The chemical compositionof b${_o}$ and  ω${_o}$ was determined by means of energy dispersive X-ray microanalysis. In particular, the impact of the Mo content on thegrowth of the  ω${_o}$ grains within the b${_o}$ matrix was investigated. Additionally, nanohardness measurements in c, a${_2}$, b${_o}$ and (b${_o}$ +  ω${_o}$) grainswere performed by cube corner indentation. The results show that b${_o}$ is the hardest phase in the TiAl–Nb–Mo alloy system when finelydispersed xo precipitates are present.
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000224461 7001_ $$0P:(DE-HGF)0$$aRashkova, Boryana$$b1
000224461 7001_ $$0P:(DE-HGF)0$$aSchöberl, Thomas$$b2
000224461 7001_ $$0P:(DE-H253)PIP1012182$$aSchwaighofer, Emanuel$$b3
000224461 7001_ $$0P:(DE-HGF)0$$aZhang, Zaoli$$b4
000224461 7001_ $$0P:(DE-H253)PIP1009532$$aClemens, Helmut$$b5
000224461 7001_ $$0P:(DE-H253)PIP1010405$$aMayer, Svea$$b6$$eCorresponding author
000224461 773__ $$0PERI:(DE-600)2014621-8$$a10.1016/j.actamat.2013.10.036$$gVol. 64, p. 241 - 252$$p241 - 252$$tActa materialia$$v64$$x1359-6454$$y2014
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