Mechanical and structural properties of Al-Ni alloys rapidly quenched from the melt

Tonejc, Antun; Rocak, Dubravka; Bonefačić, A.

doi:10.1016/0001-6160(71)90097-6

Cited by 44 publications

(10 citation statements)

References 6 publications

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“…The hardness of the specimen sintered at 294 MPa and 490 MPa is proportional to the amount of Ni dissolved in the Al matrix. These specimens were sintered at 680-780 K. This result matched with a statement in the paper of A. Tonejc et al 11) Below 780 K, the supersaturated solid solution made by dissolving of excess Ni element was preserved after PCPS process. Hardness of the specimen sintered at 830 K under load of 98 MPa deviates lower from the linearity.…”

Section: Microstructuresupporting

confidence: 84%

“…The peaks corresponding to Al 3 Ni and η-phase except for Al were mainly observed in the atomized powder and the sintered compacts. The η-phase is an intermediate metastable phase which was observed in quenched Al-2.3-10.1 at%Ni binary alloys by A. Tonejc et al 11) New peaks which are marked by arrows in Fig. 3 were detected in the specimen sintered over 730 K. These peaks were indexed to Al 3 Ni(101), (111) and (210) from lower diffraction angle,respectively.…”

Section: Methodsmentioning

confidence: 72%

“…It increased from 730 K and exceeded the value of extruded compact at 780 K. Applying the research on quenched Al-Ni binary alloy powder done by A. Tonejc et al, 11) the amount of the Ni content in the Al matrix can be estimated. The amounts of dissolved Ni in Al matrix of the sintered sample at 630, 680, 730 and 780 K were 2.9, 2.9, 2.4 and 1.1 at%, respectively.…”

Section: Microstructurementioning

confidence: 91%

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Microstructure and Mechanical Properties of Gas Atomized Aluminum Alloy Powder Compact Densified by Pulsed Current Pressure Sintering Process

Nagae

Yokota²,

Nosé³

et al. 2002

Mater. Trans.

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A Pulsed current pressure sintering (PCPS) method was employed to sinter compacts of gas atomized Al-8%Ni-2%Mn-1%Cu-0.8%Zr-0.7%Ti-0.25%Mg alloy powder which consisted of Al-Al 3 Ni eutectic and α-Al supersaturated solid solution due to high quenching rates. Results are as follows: (1) The sintered compacts had Al 3 Ni precipitates on the boundaries of the initial Al particles. As those precipitates increased, the hardness of the compact decreased. Maximum value of hardness of the compact was HV200 and about 3 at% of Ni atom was excessively dissolved in this compact. (2) The hydrogen content was decreased from 60 to 20 ppm by employing the sintering schedule to remove the adsorbed gas on the particle effectively. The tensile strength of the sintered compact was increased to 500 MPa which was comparable with that of an extruded compact.

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Section: Microstructuresupporting

confidence: 84%

Section: Methodsmentioning

confidence: 72%

Section: Microstructurementioning

confidence: 91%

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Microstructure and Mechanical Properties of Gas Atomized Aluminum Alloy Powder Compact Densified by Pulsed Current Pressure Sintering Process

Nagae

Yokota²,

Nosé³

et al. 2002

Mater. Trans.

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“…The overall precipitation sequence in vapourquenched supersaturated f c c alumininm alloys is very different from that observed in supersaturated aluminium alloys prepared by either liquid-quenching [4][5][6][7][8][9][10] or conventional solidstate quenching [ 11 ]. Firstly, the vapour-quenched alloys are more resistant to annealing.…”

Section: Discussionmentioning

confidence: 99%

Precipitation of equilibrium phases in vapour-quenched Al-Ni. Al-Cu and Al-Fe alloys

Cantor

Cahn

1976

J Mater Sci

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In situ annealing experiments in the transmission electron microscope have been used to investigate the thermal stability and precipitation behaviour of non-equilibrium phases in vapour-quenched AI-Ni, AI-Cu and AI-Fe alloys prepared by co-sputtering. The non-equilibrium phases exhibit surprisingly high thermal stability and the general nature of precipitation is different from that in liquid-quenched or conventional alloys. These phenomena are caused by the very small as-quenched grain size.

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“…The lattice constant for this structure measures 5.9988 Å [63] which far exceeds what we observed experimentally and rules out its presence in our Al/Ag specimen. The Ni 0 08 Al 0 92 structure in the Ni-Al phase diagram [64] is also fcc and is measured as having a lattice parameter (4.025 Å) [65] that is significantly different from the lattice parameter refined for the Al (4.0483 ± 0.0022 Å) in the Al/Ni specimen. Examination of the Pd-Al phase diagram found PdAl 4 [66] as the closest stoichiometric match to the system examined here (~Pd 0 08 Al 0 92 ), however has P6 3 22 space group indicative of a hcp structure [63] crystal system which clearly is not observed in the XRD data for the Al/Pd sample in Fig.…”

Section: Ii12 Synthesis and Functionalization Of Aluminum Nanopartimentioning

confidence: 84%

Nano Engineered Energetic Materials (NEEM)

Dlott¹,

Eden²,

Girolami³

et al. 2011

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. The ARO Nano Engineered Energetic Materials (NEEM) MURI program has been exploring new methodologies for developing energetic material formulations with control of all constituents over a wide range of length scales from 1 nm to 1 mm and larger and employing the latest techniques in molecular self-assembly and supramolecular chemistry for synthesizing and assembling NEEMs. The synthetic efforts have been guided by theoretical calculations and dynamic performance testing methodologies that also operate on all length scales. This final report ABSTRACTThe ARO Nano Engineered Energetic Materials (NEEM) MURI program has been exploring new methodologies for developing energetic material formulations with control of all constituents over a wide range of length scales from 1 nm to 1 mm and larger and employing the latest techniques in molecular self-assembly and supramolecular chemistry for synthesizing and assembling NEEMs. The synthetic efforts have been guided by theoretical calculations and dynamic performance testing methodologies that also operate on all length scales. This final report provides a summary of the accomplishments. In particular, new methods to generate metal nanoclusters were developed that are stabilized against environmental degradation while preserving their high energy content. Rapid expansion supercritical solution processes were developed and applied to synthesize nanosized particulate oxidizers and energetic oxidizer shell/fuel core composites. Surface science and experimental chemistry methods were applied to study the structures and energy releasing reaction pathways of NEEMs. Unique diagnostic capabilities were developed and applied to study the fundamental mechanisms that underlie NEEM dynamic performance. Combustion mechanisms of various NEEMs, including nanothermites and nanoparticulate fuel/liquid oxidizer systems, were experimentally analyzed. The reactive and thermal characteristics of NEEMs were studied using large (billion atoms) multiscale simulations that couple quantum-mechanical calculations to molecular dynamics calculations. In particular, the stability, structure and energetics of metallic nanoparticles with a special focus on the relationships between particle size, shape and excess surface free energy were studied. A unified theory of ignition and combustion of aluminum particles for a wide range of sizes, from nano to meso scales was established. . 12, 777-787 (2010 (b) Papers published in non-peer-reviewed journals or in conference proceedings (N/A for none)18.00 Number of Papers published in peer-reviewed journals:Number of Papers published in non peer-reviewed journals:1. USC group, "Multibillion-atom simulations of nano-mechano-chemistry on petaflops computers," First

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Mechanical and structural properties of Al-Ni alloys rapidly quenched from the melt

Cited by 44 publications

References 6 publications

Microstructure and Mechanical Properties of Gas Atomized Aluminum Alloy Powder Compact Densified by Pulsed Current Pressure Sintering Process

Microstructure and Mechanical Properties of Gas Atomized Aluminum Alloy Powder Compact Densified by Pulsed Current Pressure Sintering Process

Precipitation of equilibrium phases in vapour-quenched Al-Ni. Al-Cu and Al-Fe alloys

Nano Engineered Energetic Materials (NEEM)

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