Nanostructured amorphous materials represent a novel class of materials characterized by nanostructured amorphous particles and amorphous interfaces between particles. Due to the nanometer scales, amorphous disorder, controllable atomic and electronic structure, this kind of material exhibits numerous unique properties distinct from conventional materials. Recently, scholars discovered that composites composed of nanostructured amorphous materials as the matrix with precipitated nanocrystals exhibited excellent mechanical properties. However, densification of both nanostructured amorphous materials and nanostructured amorphous composites was primarily achieved through ultra-high-pressure forming. During ultra-high-pressure forming, the plastic deformation of nanostructured amorphous powder under high pressure enabled amorphous particles to contact each other, extrude pores, and diffused through interfaces to form new interfaces. However, these studies required high-pressure forming equipment, and the associated costs constrained further applications.In contrast to the ultra-high-pressure molding mentioned earlier, Rosenflanz et al. employed viscous sintering to consolidate amorphous powder within the supercooled liquid region. This method utilized amorphous powder with low viscosity above the glass transition temperature (Tg) and its viscous flowed under external pressure to fill the pores between particles, thereby achieving densification. This approach only required 34 MPa pressure, effectively circumventing the unrealistically high pressures previously required for amorphous material preparation. However, crystallization during viscous sintering may impede the viscous flow of amorphous powder, necessitating a sufficiently wide kinetic window between the glass transition temperature (Tg) and crystallization temperature (Tx) to achieve densification. To address this issue, Rosenflanz et al. again employed an alumina–rare earth oxide system (Al2O3–RE2O3) to modulate the polyhedral structure of Al–O, regulated the glass formation ability of the system, substantially widen the kinetic window of the oxide system, and fabricated a range of dense amorphous ceramics. Nonetheless, viscous sintering process has never been reported in the realm of nanostructured amorphous materials.