Papers by Keyword: Al-Ni Alloy

Abstract: In this study, temperature dependence of internal friction, tand, of ECAPed Al-Ni eutectic alloy was measured using a dynamic mechanical analysis (DMA) to discuss the recrystallization behavior of the alloy. The temperature dependence of internal friction of 8 passed samples shows a large peak at around 200 °C on heating, while this peak disappears on the subsequent cooling stage. Moreover, smaller peak was observed for 2 passed samples. Therefore, it can be concluded that the origin of the peak comes from the recrystallization of a-Al.

Abstract: This paper presents the method of obtaining in conditions of ultra speed solidification of Al-Ni alloys with high Ni content on purpose to search the catalytic action of the NiAl₃ as a separate compound. It is characterized to catalyze from Ni-Al alloy ultra rapid solidificated in fibers with lengths between 20-40 μm.

Abstract: The microstructural changes of the primary Al3Ni phases in hypereutectic Al-Ni alloys solidified under various high magnetic field gradients were investigated. It was found that the application of a magnetic field gradient induced an aligned structure of the primary Al3Ni phases similar to those in a high uniform magnetic field. However, the high magnetic field gradient showed more obvious effect on the alignment of the primary Al3Ni phases than the uniform magnetic field, although this effect strongly depended on the alloy composition.

Abstract: When Al-Ni alloys solidified from melted zone and semi-solid zone, respectively, with a magnetic field up to 12.0T (Tesla) applied, the paramagnetic Al3Ni crystals in the precipitated Al3Ni phase were aligned with their c-axes parallel to the field and a unique laminated textured microstructure of the precipitated phase perpendicular to the field was formed. There were critical values of magnetic intensity Bcrit and heating temperature Tcrit at or above which the textured microstructure could be formed. The behavior of magnetic orientation of the precipitated phase was investigated experimentally. The results were discussed in terms of magnetic rotation of crystals with magnetic anisotropy, crystal growth, mechanical and magnetic interactions among the magnetized Al3Ni grains in a high magnetic field.