Studies of Mechanical Properties of Nanoscaled ZrO2 Particulate Reinforced 5083 Alloyusing Friction Stir Process

• Main Authors: Yu-duei Lin, 林育兌
• Other Authors: Ho, New-Jin
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/39028456371038909005

碩士 === 國立中山大學 === 材料科學研究所 === 93 === We applied the Friction-Stir Process (FSP) to make the ZrO2 /5083 Al alloy composite material, and analyzed its physical properties in different aspects. Different weight percents of nanometer composite materials, ZrO2/Al, with well distributed strengthening grains were manufactured with the FSP which was used for five runs on ZrO2 along with the matrix material, aluminum, at 505°C, and created reactants of Al3Zr, tetragonal D023 structure, and Al2O3, identified with X-ray diffraction analysis. The grain size of 5083 Al-alloy could be finer, around 2.6μm, by the FSP. This study suggests that increasing the addition of ZrO2 into the Al matrix could make the grain size of aluminum finer. We found that the Al grain size would be able to down to 0.66μm, as 15.3 wt% of ZrO2 powder was reached. The mechanical properties of the Al-matrix material could be also modified by adding ZrO2 that reduces the ductility but boosts the strength of the matrix material. When we put 15.3 wt% of ZrO2 powder, 5083 Al-alloy attained the hardness of 158Hv, almost twice of hardness of the original alloy material, and its yield strength also increased from 125MPa to 400MPa as well.