C-21 Effect of Si addition on chipping characteristics of lead-free 6061 based aluminum alloy under two-dimensional cutting(Session: Cutting)

概要

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Effect of Si particles on chipping characteristics of lead-free [1] AA6061 based aluminum alloys under two-dimensional cutting operations has been studied together with metallographic observations and fracture bending tests of chips. The addition above 2 mass% Si brought a generation of fine chips with a curled and saw-blade shape, leading to the enhanced machinability of the alloys. In the first stage of chipping process, Si particles in the alloys played a role in decreasing a friction coefficient on the rake surface of tool and also induced plastic instability in the chip due to serving the preferential void formation sites ahead of tool tip subjected to the mode I (tensile) stress state. In the secondary stage of the collision of chips against work, the curled and saw-blade shape chip was easily broken owing to the notch effect.
2006-11-08