Bulk Nanocrystalline Fe₃Al‐Based Material Prepared by Aluminothermic Reaction

Abstract

Excellent mechanical properties are often found in bulk nanocrystalline materials. However, it is a major challenge to find a method of processing that is convenient, has a low cost, and a capacity to be scaled up. Bulk nanocrystalline Fe3Al‐based material with a MnAl1.11S1.89 contamination phase has been successfully synthesized (see figure) by making use of a simple aluminothermic reaction route.

Enhanced Ductility of Dendrite‐Ultrafine Eutectic Composite Fe3B Alloy Prepared by a Self‐Propagating High‐Temperature Synthesis

“…The copper mold with the reactants was placed in an SHS reactor. [21] The reactor was purged with argon gas at room temperature, heated to 180 8C, and then purged for a second time. Heating of the reactor continued after the introduction of 8 MPa of argon gas.…”

“…[21] Then, the combustion wave of the reaction propagates from the top to the bottom of the reactant pellet, and the reactants are transformed into Fe 3 B and Al 2 O 3 where the combustion wave has passed. The adiabatic temperature (T ad ) of the combustion reaction [Eq.…”

“…(1)] at 260 8C is approximately calculated to be about 3100 8C. [21,22] Fe 3 B and Al 2 O 3 are in a very superheated liquid state at 3100 8C; since liquid Al 2 O 3 is immiscible with liquid Fe 3 B, it is automatically separated and raised to the top because of its low density, and the product is deposited on the copper substrate surface. Figure 1 shows the XRD pattern of the Fe 3 B alloy.…”

Ultrafine Eutectic-Dendrite Composite Bulk Fe-B Alloy with Enhanced Ductility

“…This method was depicted in other literatures. [15][16][17][18] The polished cross sections were investigated by X-ray diffractometry (XRD, Philips X'pert) using CuK radiation. The samples before and after compressive test were observed by a JSM-5600LV scanning electron microscope (SEM).…”

Aluminothermal Reaction Approach for Micro‐/Nanofabrications: Syntheses of In2O3 Micro‐/Nanostructures and InN Octahedral Nanoshells

“…Al 2 O 3 þ 2Fe, which releases a large amount of heat to attain a temperature higher than 3000 8C, well above the melting points of both iron and Al 2 O 3 . In scientific fields, researchers utilized ATRs to prepare metals [3] and alloys, [4,5] ceramic and composite materials, [6,7] and coating layers. [8] However, all these studies merely concern the utilization of ATRs in the synthesis and processing of materials from solid-state reactions.…”