Oxidation of Mechanically Alloyed Al-rich Al–Ti Powders

Zhu, Xiaoying; Schoenitz, Mirko; Dreizin, Edward L.

doi:10.1007/s11085-006-9023-0

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…In addition, it is worth noting that no Al melting peak is observed, which is similar to the DTA results of mechanically alloyed Al–20Ti and Al–25Ti. 22 According to the XRD pattern of Al–20Mg–2Zr powder, most of Al has been alloyed with Mg and Zr to form intermetallic Al 3 Mg 2 and Al 3 Zr; the rest of pure Al is less, which results to the phenomenon of no Al melting peak in the DTA trace.…”

Section: Resultsmentioning

confidence: 99%

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Thermal behaviour of gas atomised Al–20Mg–2Zr alloy powder

Zou

Cai

2016

Materials Science and Technology

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A novel ternary alloy with the composition of Al–20Mg–2Zr (wt-%) was prepared by close coupled gas atomisation. The thermal oxidation behaviour of the powder was examined by thermogravimetry–differential thermal analysis. The results showed that the oxidation proceeded in single step, and the violent exothermic reaction occurred after 900°C was almost complete. The activation energy of the oxidation was ∼250 kJ mol− 1, and the frequency factor was ∼1.47 × 1011 s− 1 and 3.36 × 1011 s− 1 using the Kissinger and Ozawa method respectively. The special feature of the pulsed oxidation was explained by the melt dispersion oxidation mechanism. The excellent thermal reactivity exhibited by the Al–20Mg–2Zr powder suggested that this novel alloy could become one of the most promising materials in energetic applications.

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Section: Resultsmentioning

confidence: 99%

“…Similarly, the Al–Ti alloys were also investigated as fuels. 21,22 It was found that the ignition temperature of Al–Ti alloys reduced significantly, which concerned with the exothermic formation of the metastable L1 2 phase of Al 3 Ti. The burning rates of Al–Ti powder particles were faster than that of the same size Al particles.…”

Section: Introductionmentioning

confidence: 99%

Thermal behaviour of gas atomised Al–20Mg–2Zr alloy powder

Zou

Cai

2016

Materials Science and Technology

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“…Semenjak ditemukannya paduan Al-Ti, ternyata paduan ini telah dikenal sebagai salah satu bahan yang paling prospektif. Paduan ini dapat digunakan didalam industri luar angkasa dan berbagai kegunaan untuk peralatan mesin [2]. Paduan Al-Ti dapat juga diaplikasi pada suhu tinggi karena paduan ini antara lain memiliki ciri-ciri densitas yang rendah, titik lebur yang tinggi dan tahan terhadap korosi [3,4].…”

Section: Pendahuluanunclassified

PENGARUH WAKTU PEMADUAN BAGI TEKNIK PEMADUAN MEKANIK TERHADAP KEKERASAN PADUAN Al-10%beratTi

Supriyanto¹

2018

Simet

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ABSTRAKPengaruh waktu pemaduan terhadap ukuran partikel dan kekerasan jasad hijau paduan Al10%beratTi telah dilakukan dengan menggunakan teknik pemaduan mekanik. Plenetari model Fritsch Pulverisette-5 dengan kecepatan 360 putaran per menit dan bola stainless steel berdiameter 15 mm digunakan sebagai alat pemaduan. Asam stearik digunakan sebagai bahan mengawal proses selama proses pemaduan. Serbuk aluminium dan titanium dengan komposisi Al-10%beratTi, asam stearik dan bola stainless steel dimasukkan kedalam Plenetari model Fritsch Pulverisette-5 dalam persekitaran gas argon. Rasio berat bola stainless steel terhadap berat serbuk adalah 20 : 1. Waktu pemaduan adalah 2, 5, 10, 15, 20 dan 30 jam dengan waktu istirahat selama 30 menit setiap 2,5 jam pemaduan untuk menghindari peningkatan suhu yang mendadak. Perubahan struktur dan morfologi serbuk selama proses pemaduan diamati menggunakan XRD, SEM dan EDX, sedangkan uji mikrokekerasan digunakan Vickers. Hasil yang diperoleh menggunakan XRD menunjukan bahwa puncak-puncak titanium semakin menghilang dengan bertambahnya waktu pemaduan, yang menujukkan bahwa telah terbentuk proses pemaduan dimana atom titanium masuk ke dalam matrik aluminium. Hasil SEM menunjukkan bahwa ukuran partikel Al-10%beratTi semakin berkurang dengan bertambahnya waktu pemaduan. Hasil EDX menunjukkan bahwa serbuk yang dihasilkan adalah paduan biner Al-Ti. Hasil uji mikrokekerasan menunjukkan bahwa kekerasan semakin meningkat dengan bertambahnya waktu pemaduan.Kata kunci: al-10%beratTi, pemaduan mekanik, asam stearik, XRD, vickers. ABSTRACTThe influence of milling time on the particle size and hardness of

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“…One type of potential application for mechanically alloyed materials includes the use as metallic fuel additives for propellants, explosives, and pyrotechnics (Schoenitz and Dreizin, 2003Zhu et al, 2006;Chen et al, 2006;Zhu et al, 2007). Such materials are being developed to tailor the rates of energy release from the burning metal and thus improve performance of various energetic formulations.…”

Section: Chapter 5 Mechanically Alloyed Al-i Composite Materials Intmentioning

confidence: 99%

Inactivation of Aerosolized Biological Agents using Filled Nanocomposite Materials

Grinshpun¹,

Schoenitz²,

Dreizin³

et al. 2013

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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 this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)2. REPORT TYPE 3. DATES COVERED (From -To) Approved for public release; distribution is unlimited.In this multi-institutional grant, a new method for inactivating aerosolized biological agents was developed utilizing a new class of energetic materials: filled nanocomposite materials. The implemented approach enabled a controllable release of iodine-based oxidizing species in the combustion environment to inactivate viable airborne bio-agents, such as stress-resistant bacterial spores and viruses. Composites with adjustable Al/I2 ratios were produced. A state-of-the-art experimental facility was developed for studying how novel energetic formulations and their combustion products affect the viability of aerosolized spores and viruses during a short (< 1 s) exposure times. Controlled bioaerosol dispersal and sample collection protocols were developed and optimized. The dry-heat inactivation of aerosolized spores was quantified separately from chemical effects and linked to DNA repair mechanisms. It was concluded that the iodine-containing powder provided significantly more effective inactivation of airborne spores than non-iodinated powders. The results of this research help to better understand physical, physicochemical, and biological properties associated with inactivation of aerosolized bio-agents in combustion environments.Bioaerosol inactivation, spore, virus, bio-agent defeat, energetic material, iodine 1.000 000 x E -10 1.013 25 x E +2 1.000 000 x E +2 1.000 000 x E -28 1.054 350 x E +3 4.184 000 4.184 000 x E -2 3.700 000 x E +1 1.745 329 x E -2 t k = (t o f + 459.67)/1.8 1.602 19 x E -19 1.000 000 x E -7 1.000 000 x E -7 3.048 000 x E -1 1.355 818 3.785 412 x E -3 2.540 000 x E -2 1.000 000 x E +9 1.000 000 4.183 4.448 222 x E +3 6.894 757 x E +3 1.000 000 x E +2 1.000 000 x E -6 2.540 000 x E -5 1.609 344 x E +3 2.834 952 x E -2 4.448 222 1.129 848 x E -1 1.751 268 x E +2 4.788 026 x E -2 6.894 757 4.535 924 x E -1 4.214 011 x E -2 1.601 846 x E +1 1.000 000 x E -2 2.579 760 x E -4 1.000 000 x E -8 1.459 390 x E +1 1. ABSTRACTIn this multi-institutional grant, a new method for ...

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Oxidation of Mechanically Alloyed Al-rich Al–Ti Powders

Cited by 12 publications

References 25 publications

Thermal behaviour of gas atomised Al–20Mg–2Zr alloy powder

Thermal behaviour of gas atomised Al–20Mg–2Zr alloy powder

PENGARUH WAKTU PEMADUAN BAGI TEKNIK PEMADUAN MEKANIK TERHADAP KEKERASAN PADUAN Al-10%beratTi

Inactivation of Aerosolized Biological Agents using Filled Nanocomposite Materials

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