Identification of thermal effects involved in DSC experiment on Al-Cu-Mg-Ag alloys with high Cu：Mg ratio

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2011-12, Vol.18 (6), p.671-675
• Main Authors: Zhang, Jian-bo, Zhang, Yong-an, Zhu, Bao-hong, Wang, Feng, Li, Zhi-hui, Li, Xi-wu, Xiong, Bai-qing
• Format: Article
• Language: English
• Subjects: Alloys; Aluminum base alloys; Calorimetry; Ceramics; Characterization and Evaluation of Materials; Chemical precipitation; Chemistry and Materials Science; Composites; Copper; Copper base alloys; Corrosion and Coatings; Differential scanning calorimetry; DSC; Electrical conductivity; Electrical resistivity; Electron diffraction; Glass; Hardness; Hardness tests; Magnesium; Materials Science; Metallic Materials; Natural Materials; Precipitation; Resistivity; Silver base alloys; Surfaces and Interfaces; Temperature effects; Thin Films; Tribology; 差示扫描量热法; 热效应; 透射电子显微镜; 银合金; 高铜
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-011-0494-x

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℃ 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 micro-structure.