A phase separation reaction in a binary titanium-chromium alloy

Narayanan, Gopal; Luhman, T.; Archbold, T.F.; Taggart, R.; Polonis, D.H.

doi:10.1016/0026-0800(71)90063-2

Cited by 35 publications

(14 citation statements)

References 4 publications

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“…The oxygen content in the glove box has been reported in the ␤ phase of these alloys for Tirich compositions. [8,12,13] The metastable ␤ phase tends to was maintained below 10 ppm during all the depositions. The measured powder flow rate was 2.57 g/min, while the decompose into the solute-lean ␤ 1 and solute-rich ␤ 2 phases.…”

Section: Introductionmentioning

confidence: 99%

“…The as-deposited alloys ing the decomposition of the metastable ␤ matrix in these binary alloys. While earlier studies report decomposition were sectioned using electrodischarge machining (EDM) and subsequently investigated by SEM in a PHILIPS* XL30 by a nucleation and growth mechanism, [12,13] more recent studies contend that the matrix undergoes a spinodal *PHILIPS is a trademark of Philips Electronic Instruments Corp., Mahdecomposition. [8,9] Menon and Aaronson [10] and Mebed wah, NJ.…”

Section: Introductionmentioning

confidence: 99%

“…There have been a number of studies on the phase 760 W Nd:YAG laser, which produced near-infrared laser radiation at a wavelength of 1.064 m, was used for all the transformations occurring in Ti-Cr alloys as a function of composition and heat treatments. [8][9][10][11][12][13] A miscibility gap depositions. The energy density was in the range of 30,000 to 100,000 W/cm 2 .…”

Section: Introductionmentioning

confidence: 99%

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Phase evolution in laser-deposited titanium-chromium alloys

Banerjee

Collins

Fraser

2002

Metall Mater Trans A

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Ti-Cr alloys have been laser deposited from powder feedstock consisting of a blend of elemental powders using the laser-engineered net-shaping (LENS) process. The microstructure of the as-deposited Ti-Cr alloys primarily consists of a metastable bcc matrix of ␤ -Ti(Cr) with precipitates along the grain boundaries. The grain-boundary precipitates have been identified to be of three types, essentially pure hcp Ti, an alloyed hcp phase designated ␣ -Ti(Cr), and the C14 TiCr 2 Laves phase. Initial stages of decomposition, visible within the ␤ matrix, suggest a spinodal clustering process resulting in a fine dispersion of second phases. Diffraction studies have revealed the presence of fine precipitates of ␣ within the ␤ matrix. The evidence for the precipitation of the metastable phase within the ␤ matrix is not strong. The phase evolution in the LENS-deposited Ti-Cr alloy has been discussed in the context of rapid solidification and the enthalpy of mixing of the elemental powders.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase evolution in laser-deposited titanium-chromium alloys

Banerjee

Collins

Fraser

2002

Metall Mater Trans A

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“…phase 19) and phase separation. 20) If such diffusional decomposition occurs, the concentration of the -stabilizer in the matrix is increased and the strength of matrix is changed by precipitation hardening and solution hardening. These microstructural changes should have strong effects on superelastic behavior.…”

Section: Discussionmentioning

confidence: 99%

Effect of Cooling Rate on Superelasticity and Microstructure Evolution in Ti-10V-2Fe-3Al and Ti-10V-2Fe-3Al-0.2N Alloys

Tomio

Maki

2009

Mater. Trans.

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A Ti-10V-2Fe-3Al alloy with a small amount of nitrogen shows superelasticity. Controlling of the cooling rate from solution treatment temperature improves superelasticity in both Ti-10V-2Fe-3Al and Ti-10V-2Fe3-Al-0.2N alloys. In this study, a wider range of the cooling rate was examined and microstructure change during slow cooling was investigated through examining quenched and aged specimens by means of hardness and resistivity measurement and transmission electron microscopy. Although superelasticity is improved with a decrease in the cooling rate up to 22 K/s for the N-free alloy and up to 50 K/s for the 0.2N alloy, there is no obvious change in microstructure. It is clarified from the observation of specimens quenched and aged at the temperature range where superelasticity is improved that the phase decomposition occurs through isothermal ! phase precipitation. Therefore, microstructure evolution during slow cooling is considered to be precipitation of isothermal ! phase or its precursor phenomena.

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“…For the Ti-Cr alloy system of interest to us, TEM evidence for phase separation reaction has been reported on the titanium-rich side of the phase diagram, [8,9] while thermodynamic measurements were done by Pool et al [10] The specific heat, the thermal expansion coefficient, the resistivity, and the X-ray measurements were performed by Wirz et al [11] recently, Ikematsu et al [12] studied ribbon samples of the Ti-Cr system using TEM and hardness measurement.…”

Section: Introductionmentioning

confidence: 98%

Computer simulation and experimental investigation of the spinodal decomposition in the β Ti-Cr binary alloy system

Mebed

Miyazaki

1998

Metall Mater Trans A

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The spinodal decomposition of the ␤ Ti-Cr binary alloys system is still questionable, because there are only rare experimental and thermodynamics data; moreover, simulation results for a real alloy system have not been found. Transmission electron microscopy (TEM) and quantitative computer simulations based on Khachaturyan's diffusion equation have been employed to study the microstructural evolution occurring in the metastable ␤ Ti-Cr alloys. Our study results reveal that the metastable ␤ Ti-Cr undergoes a phase separation reaction ␤ → titanium rich (␤ 1 ) ϩ chromium rich (␤ 2 ) through a spinodal decomposition. The coherent two-phase fields show extremely fine platelike precipitates distributed homogenously through the bcc matrix, which are parallel to the {100} plane. Those precipitates are highly elastic induced from the first step of the phase separation. There is good agreement between the observed microstructure and the simulation results. The mode of formation of ␣ phase is also discussed.

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A phase separation reaction in a binary titanium-chromium alloy

Cited by 35 publications

References 4 publications

Phase evolution in laser-deposited titanium-chromium alloys

Phase evolution in laser-deposited titanium-chromium alloys

Effect of Cooling Rate on Superelasticity and Microstructure Evolution in Ti-10V-2Fe-3Al and Ti-10V-2Fe-3Al-0.2N Alloys

Computer simulation and experimental investigation of the spinodal decomposition in the β Ti-Cr binary alloy system

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