Abstract
It is known that quasicrystalline phases have high Vickers hardness and high thermal stability. Heat-resistant aluminum alloys, which contain dispersed nanoscale quasicrystalline particles and have very high tensile strength at highly elevated temperatures (473 to 673 K), were developed in 2006. We aimed to partially strengthen components using the developed material as a coating material. However, the general spraying technology, if used, would expose this coating material to high temperatures, causing the quasi-crystalline phase to decompose into an intermetallic compound phase. In this study, aluminum alloy coatings containing dispersed nanoscale quasicrystalline particles have been produced using the cold spray method, which can be performed at comparatively lower temperatures. Rapidly solidified powder was produced by the atomization method, which consists of a combined high-pressure gas atomization and water atomization process. The cold spray process was carried out on nitrogen or helium gas at 3 MPa and 673 K. As a result of X-ray analysis and DSC measurement, it was ascertained that the dispersed quasicrystalline structure is maintained even after the cold spray coating process. Also from TEM observation, the dispersed quasicrystalline structure was maintained within the coating.
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