Effect of SPS Sintering Process on Compressive Strength and Magnetic Properties of CoCuFeMnNi Bulk Alloy

CoCuFeMnNi bulk nanocrystalline alloy was prepared by mechanical alloying (MA) and spark plasma sintering (SPS). The effects of sintering parameters, such as temperature, heating rate, sintering pressure, pressing time, and cooling mode on the compressive strength of bulk sintered alloys were analyzed, and the effects of sintering temperature and pressing time on the magnetic properties of the alloys were investigated. The compressive strength test results show that the compressive strength of the alloy first increases and then decreases with the increase of heating rate and pressing time. A model was established to study the mechanisms of mechanical properties of the CoCuFeMnNi alloy. The strengthening mechanisms such as grain refinement strengthening, solid solution strengthening, and cluster strengthening of CoCuFeMnNi alloy was quantitatively analyzed. The magnetic test results show that the prepared CoCuFeMnNi amorphous alloy powder and its bulk alloy are typical soft magnetic materials. The saturation magnetic induction strength of the bulk alloy increases with the increase of sintering temperature and pressing time. However, the coercivity first decreases and then increases.