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

Abstract

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.

Preparation, Microstructure and Thermal Property of ZrAl3/Al Composite Fuels

“…The prepared alloys were generally melted about eight times to ensure homogeneity. A close-coupled gas-atomization (CCGA) instrument was the main equipment for preparing Al-xZr composite fuels [32][33][34]. The obtained AlÀ Zr mother alloys were atomized in the CCGA equipment.…”

Size-Dependent Phase Transformation during Gas Atomization Process of Cu–Sn Alloy Powders

“…Many studies focused on the preparation of micro and nano powders [9,10,11,12,13]. A variety of methods can be applied for powder preparation, but the production process is mainly divided into two categories based on the substantive analysis: mechanical and physical chemistry methods, such as ball milling [9,10], liquid reduction methods [11,12], and atomization [13]. Ball milling takes a long time, and the ball may cause rising temperature due to the impact effect of the grinding, which triggers the metal alloying.…”