Identification of thermal effects involved in DSC experiment on Al-Cu-Mg-Ag alloys with high Cu:Mg ratio |
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| Authors: | Jian-bo Zhang Yong-an Zhang Bao-hong Zhu Feng Wang Zhi-hui Li Xi-wu Li Bai-qing Xiong |
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| Institution: | (1) Department of Mechanical Engineering and Institute of Materials Science and Engineering, National Central University, Taoyuan Country, 32001, Taiwan, Republic of China;(2) Present address: Ecole Centrale Nantes, Nantes, France;(3) Present address: Vicom Technology Company, Taipei, Taiwan R.O.C. |
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| Abstract: | Precipitation reactions in the differential scanning calorimetry (DSC) of an Al-Cu-Mg-Ag alloy were identified by analyzing
the results from hardness test, electrical conductivity test, and transmission electron microscope (TEM) examination. It is
discovered that thermal effects can be identified through selected area electron diffraction and bright-field images. The
reaction peaks around 171, 231, and 276°C can be attributed to a structural rearrangement of coherent zones, to the precipitation
of Ω phases, and to the precipitation of Ω and θ′ and possible combination with the transition of θ′→θ, respectively. In addition,
the hardness and electrical conductivity of the alloy change proportionately with the progression of reactions during the
heating process. This phenomenon can be attributed to the evolution of the microstructure. |
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