| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 98 === The article discusses the behaviors of Al2O3 particle reinforced 6061 aluminum matrix composite under high temperature tension and its wear resistance in room temperature. We choose 6061 aluminum composite with three different Al2O3 contents, 10%, 15% and 20%, respectively as the material of interest. We wish to improve the composite’s mechanical properties and wear resistance via cold rolling, hot rolling, and T6 heat treatment. We hope to extend the range of applications by increasing the 6XXX series aluminum alloy’s material strength and its wear resistance.
Experimental results indicate that the material’s hardness increases after cold and hot rolling. The hardness rises even more after T6 heat treatment compared with rolling. In high temperature tension tests, the ultimate tensile strengths of specimens with T6 treatments were obviously higher than those without T6 treatment. The composite with 80% hot rolling, 10%Al2O3 with T6 treatment has the maximum tensile strength of 330MPa and the specimen with 80% hot rolling, 10%Al2O3 has the minimum tensile strength of 185MPa.
In wear resistances, the wear resistances of the composites with T6 treatments are superior to the ones without treatment. The wear resistance of the specimens without T6 treatment is even weaker than that of the 6061-T6 bulk alloy. With respect to the wear frequency, the test results are better when the frequency is 30Hz than when it is 20Hz. Results show that the best wear resistance condition is under cold rolling 80%, 20%Al2O3/T6 (30Hz) which wear rate is 1.396 mm3/Nm. On the other hand, the worst wear resistance condition is under cold rolling 80%, 10%Al2O3 (20Hz) which the wear rate is 3.716 mm3/Nm.
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