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Haddad, A.

Publications and source records attributed to Haddad, A..

5 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2018

Microstructure, Corrosion and Magnetic Behavior of an Aged Dual-Phase Stainless Steel

In the present work, the effect of the precipitation phenomena on corrosion and magnetic behavior of an aged dual-phase stainless steel was investigated. Aging treatment caused the precipitation of the σ phase, chromium carbides and secondary austenite, which was accompanied by the shifting of the δ/γ interfaces inside the δ ferrite grains. Aging between 700 and 850 °C strongly deteriorated the pitting corrosion resistance of the studied material. Magnetic investigation of the aged material using the vibration sample magnetic technique revealed the sensitivity of the intrinsic magnetic properties to the smallest microstructural change. This was confirmed by the Eddy current technique that led also to the evaluation of the aging-induced localized corrosion.

36 MATERIALS SCIENCE↗
DOE OSTI2017

New Diphosphopentamolybdate K{sub 5}[HP{sub 2}Mo{sub 5}O{sub 23}] · 10H{sub 2}O: Synthesis, Structure, and Characterization

A new diphosphopentamolybdate(VI) K{sub 5}[HP{sub 2}Mo{sub 5}O{sub 23}] · 10H{sub 2}O has been prepared employing solution method and characterized by single crystal X-ray diffraction, energy dispersive analysis, infrared spectroscopy, thermal stability analysis, cyclic voltammetry analysis, and ultraviolet visible spectroscopy. The compound crystallizes in the orthorhombic sp. gr. Pcab: a = 15.9661(10) Å, b = 19.0832(10) Å, c = 20.0970(9) Å, V = 6123.27(10) Å3, Z = 8. The crystal structure contains the polyanion units [HP{sub 2}Mo{sub 5}O{sub 23}]{sup 5–} around the potassium cations and lattice water. The [HP{sub 2}Mo{sub 5}O{sub 23}]{sup 5–} subunits are connected together through K−O−Mo bridges and hydrogen bonds. The crystal shape morphology was simulated using the Bravais–Friedel–Donnay–Harker model.

36 MATERIALS SCIENCE↗
DOE OSTI2016

Technique for the comparison of light spectra from natural and laboratory generated lightning current arcs

A technique was developed for the comparison of observed emission spectra from lightning current arcs generated through self-breakdown in air and the use of two types of initiation wire, aluminum bronze and nichrome, against previously published spectra of natural lightning events. A spectrograph system was used in which the wavelength of light emitted by the lightning arc was analyzed to derive elemental interactions. A lightning impulse of up to 100 kA was applied to a two hemispherical tungsten electrode configuration which allowed the effect of the lightning current and lightning arc length to be investigated. A natural lightning reference spectrum was reconstructed from literature, and generated lightning spectra were obtained from self-breakdown across a 14.0 mm air gap and triggered along initiation wires of length up to 72.4 mm. A comparison of the spectra showed that the generated lightning arc induced via self-breakdown produced a very similar spectrum to that of natural lightning, with the addition of only a few lines from the tungsten electrodes. A comparison of the results from the aluminum bronze initiation wire showed several more lines, whereas results from the nichrome initiation wire differed greatly across large parts of the spectrum. This work highlights the potential use for spectrographic techniques in the study of lightning interactions with surrounding media and materials, and in natural phenomena such as recently observed ball lightning.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
NASA NTRS1969

Information science

Information processing techniques and systems reliability by coding, digital designed methods, retrieval, and communication

Ash, R. B.↗