Amorphization of Zr–Al solid solutions under mechanical alloying at different temperatures

Abstract

The effects of temperature on the amorphization of Zr-Al solid solutions have been investigated by ball milling Zr 100Ϫx Al x powder blends at different temperatures. At low milling temperatures, the Zr-Al solid solutions amorphized under the polymorphic constraint imposed by intensive external forcing. At elevated temperatures, the solid solution and the amorphous phases coexisted in an obvious two-phase region, signaling a transition approaching two-phase metastable equilibrium. The Al concentration needed for the complete amorphization of Zr-Al increased with increasing milling temperature. These observations, and in particular, the apparent reentrant liquidus, can be explained in terms of the temperature dependence of the external forcing effects brought in by the nonequilibrium milling process in this dynamic driven system.

Development of new Al-based nanocomposites by mechanical alloying

“…Moreover, research has been carried out to study the departure of the Al-Zr system from equilibrium by MA processing [3,11,12]. It has been shown that amorphous phase can be developed on ratios that depend mainly on Zr concentrations on alloys.…”

Phase evolution of Mg–Al–Zr nanophase alloys prepared by mechanical alloying

“…Additionally, MA can promote the formation of intermetallics in the Zr-Al system [7,8] and metastable phases in both Mg-Zr [9,10] and Mg-Al [11][12][13] systems. Most of the work published in the Al-Mg-Zr system has focused on the liquid-processing route [4,[14][15][16][17], and little or no information is available on the processing of nanophase Al-Mg-Zr alloys by MA.…”

Intermetallics in the Zr–Al diffusion zone

“…Extensive work has been reported on the Zr-Al alloys regarding amorphisation [4], nano-phase formation [5], formation of several metastable phases [6] and also making zirconium based pressure tubes with aluminium lining [7]. The Zr-Al phase diagram [8][9][10] shows ten intermetallic compounds (IMC) viz.…”