Structure and properties of rapidly solidified Al–Cr–Fe–Ti–Si powder alloys

Mechanical properties of plasma-sprayed layers of aluminium and aluminium alloy on AZ 91

“…13 The average microhardness of the plasma-sprayed aluminium alloy (223 HVm) is nearly four times higher than that of the sprayed CP aluminium (65 HVm). In reference 9 dealing with the thermal stability of a similar alloy, a hardness of 160-195 HV is listed. Figure 9 shows micrographs of the indents.…”

Structural characteristics and thermal stability of Al–5.7Cr–2.5Fe–1.3Ti alloy produced by powder metallurgy

“…The size of spheroids ranges from about 0.1 to several micrometers. Structure and phase composition of RS Al-Cr-Fe-Ti powders of similar chemical composition have already been described in detail elsewhere [20]. Therefore, only basic information is given in the following section and most of this paper is devoted to the compacted alloy.…”

“…At elevated temperatures, the Q phases transform to thermodynamically more stable crystalline intermetallic phases-mainly to Al 13 Cr 2 phase, due to the high Cr content in the investigated alloy. The supersaturated solid solution decomposes to produce precipitates leading to the hardening [20]. The solid-state phase transformations given above are accompanied by thermal effects which can be monitored by DSC.…”

“…Besides chromium, we have focused on a system alloyed with other thermally stabilizing metals-Fe and Ti [7]. In our previous reports [20,21], there are studies on structure, phase composition and thermal stability of both RS and hot extruded Al-Cr-Fe-Ti alloys having similar chemical composition except a lower Ti concentration. By increasing the Ti concentration, an improvement of the structural and mechanical stability at elevated temperatures is expected.…”

Effect of particle size on the microstructure of rapidly solidified Al–20Si–5Fe–2X (X=Cu, Ni, Cr) powder

“…By rapid solidification, alloying aluminum with transition metals in amounts much exceeding their equilibrium solubility in the solid aluminum is feasible [1]. In addition, a finer microstructure (grain size of the Al matrix and size of the secondary phase/intermetallics) can be obtained which significantly affects the mechanical properties.…”