Description:
In present work, manufacturing technologies of micro parts by micro forging andpressing were studied using strain softening phenomenon in nano grained Al-1.5mass%Mg alloy.During compressive test at 300, the Al alloy showed stain softening phenomenon by grainboundary sliding regardless of strain rate. Micro spur gear with ten teeth (height of 200 μm andpitch of 250 μm) was fabricated with sound shape by micro forging. During micro forging, increaseof applied stress induced by friction between material and die surface was effectively compensatedby decrease of stress by strain softening behavior and as a result, flow stress increased only about50 MPa more than that in compressive test. However, in micro pressing, flow of material did notoccurred sufficiently to fill die and the resultant shape of gear was very poor.