Pengaruh Pre-Milling Elemen Fe-W terhadap Karakteristik Paduan Berbasis CuNi dengan Teknik Mechanical Alloying

Abstract

Powder metallurgy is one of the effective techniques in recent years, and mechanical alloying is the latest and most advanced powder mixing process used to produce metal alloys and composite materials with special properties in powder metallurgy methods. This research aims to determine the characteristics of the alloy (CuNi)-2.5wt%.Fe-5wt%.W with variations in pre-milling duration for EDM electrode application. The alloy 2.5wt%.Fe-5wt%.W undergoes pre-milling using a ball mill for 30 minutes, 1 hour, 2 hours, and 4 hours. Subsequently, part of the mixed powder undergoes XRD testing, while the remaining (CuNi)-2.5wt%.Fe-5wt%.W powder is mixed in a V-Mixer for 2 hours and then compacted under a pressure of 250 MPa for 15 minutes to form a compact body. It is then sintered at a temperature of 770°C for 1 hour. After all stages are completed, electrical conductivity, compressive strength, hardness, density, and microstructure testing of the alloy are conducted. The alloy with a pre-milling duration of 4 hours exhibits the highest Vickers hardness, compressive strength, electrical conductivity, and density, while the alloy pre-milled for 30 minutes shows the lowest values in all tests. The microstructure of the 4-hour pre-milled alloy also displays a more uniform distribution compared to the other three variations.