Phase Composition and Microstructure Stability of Al-Ni-Zr Alloys

The paper reports on a detailed investigation of microstructure and phase composition of rapidly solidified and annealed AlNi18.5 and AlNi17Zr1.8 ribbons. The ribbons were prepared by the melt spinning (planar flow casting) technique. The microstructure and phase composition have been studied by TEM and XRD. The specimens were annealed and subsequently subjected to microstructure investigations to asses their thermal stability. Rapidly solidified alloys are composed of a-Al and Al3Ni phase grains. No significant difference in the shape between Al and Al3Ni grains was found. The Al9Ni2 metastable phase was identified in the rapidly solidified AlNi17Zr1.8 alloy and the Al3Zr phase precipitates from the a-Al solid solution in the AlNi17Zr1.8 alloy after the high temperature annealing.

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Microstructures Development in Al-5Fe and Al-5Fe-3Y Alloys Solidified at Different Cooling Rate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.189-193.2462 ◽

2011 ◽

Vol 189-193 ◽

pp. 2462-2466

Author(s):

Guo Fa Mi ◽

Cui Fen Dong ◽

Chang Yun Li ◽

Hai Yan Wang

Keyword(s):

Rare Earth ◽

Phase Composition ◽

Intermetallic Compound ◽

Cooling Rate ◽

Melt Spinning ◽

Metastable Phase ◽

Vacuum Melting ◽

Suction Casting ◽

Rapidly Solidified

Cast, sub-rapidly solidified and rapidly solidified Al-5Fe alloy and Al-5Fe-3Y alloy were respectively prepared by vacuum melting, suction casting and melt spinning. The effect of increasing cooling rate and adding rare earth Y alloy on microstructures and phase composition were investigated. The results showed that the acicular Al3Fe phase transferred to spherical phase and dispersed secondary precipitations were also found when 3.0 wt% Y was added in the Al-5Fe alloy. Meanwhile, the microstructures were apparently refined by the increasing of cooling rate. The metastable phase A16Fe and intermetallic compound A110Fe2Y phase have been observed in Al-5Fe alloy and Al-5Fe-3Y alloy, respectively.

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Evolution of the structure and phase composition of rapidly solidified Al-Mg-Mn-Sc-Zr alloys during deformation in a bridgman anvil

Russian Metallurgy (Metally) ◽

10.1134/s0036029510040154 ◽

2010 ◽

Vol 2010 (4) ◽

pp. 328-334 ◽

Cited By ~ 4

Author(s):

I. G. Brodova ◽

I. G. Shirinkina ◽

O. V. Antonova ◽

A. V. Chirkova ◽

S. V. Dobatkin ◽

...

Keyword(s):

Phase Composition ◽

Bridgman Anvil ◽

Rapidly Solidified ◽

Zr Alloys

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Rapidly Solidified Ti Alloys Containing Metalloids and Rare Earth Metals— Their Microstructure and Mechanical Properties

MRS Proceedings ◽

10.1557/proc-28-353 ◽

1983 ◽

Vol 28 ◽

Cited By ~ 2

Author(s):

C.S. Chi ◽

S.H. Whang

Keyword(s):

Rare Earth ◽

Melt Spinning ◽

Elevated Temperatures ◽

Age Hardening ◽

Second Phase ◽

Precipitation Reaction ◽

Strength Increase ◽

Ti Alloys ◽

Significant Difference ◽

Rapidly Solidified

ABSTRACTRapidly solidified (RS) Ti alloys containing novel additives were prepared by splat quenching and melt spinning techniques. Microstructures of the as-quenched and heat-treated alloys were studied by electron microscopies. The results show that microstructural refinement and precipitation reaction are universal phenomena in all RS Ti alloys. A significant difference in second phase coarsening was observed between metalloid-origin precipitates and those of rare earth-origin. The precipitates in a Ti-Al-La(Ce) were identified predominantly as rare earth-Al compounds. Exce llent stability for rare earth-origin precipitates was found.Except for a carbon-containing alloy (700 ° C), age hardening behavior is a universal phenomenon in all RS Ti alloys with additives. A significant strength increase (hardness) in the RS alloy was noted at both room and elevated temperatures.

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Phase Composition and Microstructure Stability of Al-Ni-Zr Alloys

Materials Science Forum - Materials Structure & Micromechanics of Fracture ◽

10.4028/0-87849-964-4.219 ◽

2005 ◽

pp. 219-222

Author(s):

Barbora Bártová ◽

Jan Verner ◽

Dalibor Vojtěch ◽

A. Gemperle ◽

M. Čerňanský

Keyword(s):

Phase Composition ◽

Microstructure Stability ◽

Zr Alloys

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Microstructure and metastable phase formation in a rapidly solidified Ni–Si eutectic alloy using a melt-spinning technique

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2004.02.059 ◽

2004 ◽

Vol 381 (1-2) ◽

pp. 72-76 ◽

Cited By ~ 12

Author(s):

A.T. Dutra ◽

S. Milenkovic ◽

C.S. Kiminami ◽

A.M. Santino ◽

M.C. Gonçalves ◽

...

Keyword(s):

Phase Formation ◽

Eutectic Alloy ◽

Melt Spinning ◽

Metastable Phase ◽

Metastable Phase Formation ◽

Rapidly Solidified ◽

Melt Spinning Technique

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Effect of Different Cooling Speed and Rare Earth La on the Microstructures and Phase Constitution of Al-Fe Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.2126 ◽

2010 ◽

Vol 44-47 ◽

pp. 2126-2130 ◽

Cited By ~ 3

Author(s):

Guo Fa Mi ◽

Cui Fen Dong ◽

Da Wei Zhao

Keyword(s):

Rare Earth ◽

Melt Spinning ◽

Metastable Phase ◽

Melting Furnace ◽

High Melting Point ◽

The Matrix ◽

Cooling Speed ◽

Matrix Morphology ◽

Rapidly Solidified ◽

Rare Earth La

The casting, sub-rapid solidified and rapidly solidified A1-5Fe alloys, with or without rare earth La have been respectively prepared by vacuum melting furnace, suction casting and melt spinning furnace. And the alloys were investigated with OM, TEM and XRD. The results show that the microstructure was apparently refined by the increasing of cooling rate. Meanwhile, the acicular Al3Fe phase transferred to flower-like phase in casting A1-5Fe alloy and the matrix morphology of the alloy also was changed in sub-rapidly solidified Al-5Fe alloy, while 1.5wt% La was added. The metastable phase A16Fe and Al11La3 phase with high melting point were found in Al-5Fe alloy and A1-5Fe-1.5La alloy.

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Microstructures of Rapidly Solidified Aluminum Alloys

MRS Proceedings ◽

10.1557/proc-28-317 ◽

1983 ◽

Vol 28 ◽

Author(s):

J.W. Zindel ◽

J.T. Stanley ◽

R.D. Field ◽

H.L. Fraser

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Aluminum Alloys ◽

Melt Spinning ◽

Metastable Phase ◽

Laser Surface ◽

Metastable Phase Diagram ◽

Transmission Electron ◽

Ternary Additions ◽

Rapidly Solidified

ABSTRACTAn investigation was performed to study the origin and stability of microstructures in rapidly solidified aluminum alloys. Al-Ni and Al-Fe base alloys were rapidly solidified by means of laser surface melting and melt spinning techniques. Microstructures were studied using optical and transmission electron microscopy. The effect of microstructure on mechanical properties was also studied using microhardness measurements. The origin of the observed microstructural constituents will be explained in terms of features of the metastable phase diagram. The effect of ternary additions on stability will also be considered.

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Metastable Phases in Rapidly Solidified Aluminum-Rich Al-Fe Alloys

MRS Proceedings ◽

10.1557/proc-19-265 ◽

1982 ◽

Vol 19 ◽

Cited By ~ 4

Author(s):

D. Shechtman ◽

L.J. Swartzendruber

Keyword(s):

Electron Microscopy ◽

Heat Treatment ◽

Melt Spinning ◽

Gamma Ray ◽

Resonance Spectrum ◽

Metastable Phase ◽

Metastable Phases ◽

Transmission Electron ◽

Fe Alloys ◽

Rapidly Solidified

ABSTRACTAluminum-rich Al-Fe binary alloys up to and including Al3Fe were prepared by melt spinning in order to study the metastable phase structure and its transformation following heat treatment. Transmission electron microscopy and nuclear gamma-ray resonance were utilized in the study. The rapidly solidified structure was found to contain up to three metastable phases. One of the phases, with a composition and a gamma-ray resonance spectrum appropriate for Al6Fe, has either a globular or a cellular morphology upon quenching.

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