Roles of Fundamental and Additional Hardening Precipitates on the Changes of Mechanical Properties and Electrical Resistivity in Al-Li Alloys Containing Cu and Mg

Cu, Mg을 함유한 Al-Li 합금의 기계적 성질과 전기저항 변화에 미치는 기본 및 추가 강화상들의 역할

Roles of fundamental and additional hardening precipitates on the changes of mechanical properties and electrical resistivity during precipitation decomposition in binary Al-Li, ternaty Al-Li-Cu and multi-Li-Cu-Mg-Zr alloys have been investigated by the detailed measurement of electrical resistivity, hardness and tensile strength and the observation of transmission electron micrographs. Peek hardness and tensile strength in multi-component Al-Li-Cu-Mg-Zr Alloy had higher than that of the other alloys and the results of measurement of hardness, strength and electrical resistivity in each alloys aged at 90 and $190^{\circ}C$, precipitation behaviors and mechanical properties in binary, ternary and multi-component Al-Li alloys were contributed to the ${\delta}^{\prime}$ precursory phase of ${\delta}^{\prime}$, $T_1$, G.P.B. zone and S' phases, repectively.