Nanocomposite Magnets and their Preparation under High Pressure

Abstract

This article reports current studies on nanocomposite magnets and a newly developed route for their preparation, known as crystallization of amorphous alloy under high pressure (CAAHP). The microstructure and magnetic properties of nanocomposite magnets prepared by CAAHP are presented, and the influences of pressure on the microstructures of the magnets are discussed. α‐Fe/Sm2(Fe,Si)17Cx nanocomposite magnets with a grain size <10 nm have been successfully prepared by CAAHP, and a maximum energy product of about 25 MGOe is obtained.

Effects of 4 GPa Pressure Heat Treatment on Microstructure and Micro-Mechanical Properties of LC4 Aluminum Alloy

“…For the second phase, it almost solve into aluminum alloy matrix at 470°C. Since the cooling rate is rapid during the consequent cooling process and high pressure decreases the atomic diffusion coefficient, 11) which restrain the reprecipitation of supersaturated solute atoms solved into aluminum alloy matrix, so as to decrease the amount and grain size of the second phase. Figure 3 shows the load-displacement curves for nanoindentation tests of LC4 aluminum alloy before and after high pressure treatment.…”