Hakaru Masumoto1, Masakatsu Hinai1 and Showhachi Sawaya1
1The Research Institute of Electric and Magnetic Alloys, Yagiyama-Minami 2, Sendai 982
The logarithmic decrement δ, the rigidity modulus G and the tensile strength σ t were studied on Al-Si alloys containing 0--15%Si after heat-treating or subsequent cold-working. Measurements of δ and G were carried out by the inverted torsion pendulum method at a frequency of 1 Hz, and the σ t was measured using an Instron-type testing machine.
The water-quenched alloys show the lower δ than that of the furnace-cooled alloys. The δ values of heat-treated alloys are generally low, and increase with Si content. The δ becomes fairly higher by cold-working after heat-treatments.
The G and σ t values of the heat-treated alloys increase with Si content. These alloys show larger G when furnace-cooled than that when water-quenched, and show larger σ t when water-quenched. By cold-working, the G becomes smaller and the σ t becomes larger.
damping capacity, logarithmic decrement, high damping material, aluminium-silicon alloy, cold-worked alloy, rigidity modulus, tensile strength
Please do not copy without permission.