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A hollow volcanic glass microspheres (Shirasu Balloons)/aluminum composite(SBAC), which is useful in application for its lightness, compressive strength, and damping capacity, was prepared by forcing molten Al-12Si alloy into the mold filled with Shirasu Balloons or a mixture of Shirasu Balloons and the alloy powder. Its thermal expansion was measured on both heating and cooling, over the temperature range between 20°C and 500°C. A thermal expansion hysteresis was observed when the maximum temperature in a thermal cycle rose above 100 °C. It was caused by the stress developed as a result of large difference in the expansion coefficients of body constituents. The amount of hysteresis increased as the difference increased or the maximum temperature rose.On the other hand, the thermal expansion coefficient of SBAC between 20°C and 100°C showed good agreement with Turner's equation, derived on the assumption that each constituent is constrained to change its dimension at the same rate as the composite with temperature.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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