Beschreibung:
<jats:p>In present work, manufacturing technologies of micro parts by micro forging and
pressing 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 grain
boundary sliding regardless of strain rate. Micro spur gear with ten teeth (height of 200 μm and
pitch of 250 μm) was fabricated with sound shape by micro forging. During micro forging, increase
of applied stress induced by friction between material and die surface was effectively compensated
by decrease of stress by strain softening behavior and as a result, flow stress increased only about
50 MPa more than that in compressive test. However, in micro pressing, flow of material did not
occurred sufficiently to fill die and the resultant shape of gear was very poor.</jats:p>