TY - JOUR
T1 - Impact of Cu/Mg ratio on thermal stability of hot extrusion of Al-4.6 Pct Cu-Mg-Ag alloys
AU - Chang, Chih Horng
AU - Lee, Sheng Long
AU - Hsu, Tiz Yu
AU - Lin, Jing Chie
N1 - Funding Information:
The authors thank the Material and Electro-optics Research Division of the Chung-Sheng Institute of Science and Technology, Taiwan, Republic of China, for financially supporting this research under Contract No. NSC 92-2623-7-008-002. The authors also thank Mr. Yue Te Chen for his enthusiastic assistance with the experiment.
PY - 2007/11
Y1 - 2007/11
N2 - This work explores how the Cu/Mg ratio affects the thermal stability of the extrusion of Al-4.6 pct Cu-Mg-Ag alloys at aerodynamic heating temperatures of up to 155 °C for 1000 hours. The Cu/Mg ratio was modified by adding various amounts of elemental Mg. The alloy microstructures, which determine thermal stability, were analyzed with an optical microscope, an electrical conductivity meter, a differential scanning calorimeter (DSC), and a transmission electron microscope. Experimental results indicate that reducing the Cu/Mg ratio of the alloy by the further addition of Mg causes Ω to become the primary strengthening phase after aging treatment, increasing the hardness and the thermal stability, although the θ′ phase is suppressed. The S phase does not affect the thermal stability of the alloy, because it is present in only a low quantity. Results of this study also demonstrate that the hot-extruded low Cu/Mg alloy satisfies the requirement of the material thermal stability of commercial supersonic aerial applications.
AB - This work explores how the Cu/Mg ratio affects the thermal stability of the extrusion of Al-4.6 pct Cu-Mg-Ag alloys at aerodynamic heating temperatures of up to 155 °C for 1000 hours. The Cu/Mg ratio was modified by adding various amounts of elemental Mg. The alloy microstructures, which determine thermal stability, were analyzed with an optical microscope, an electrical conductivity meter, a differential scanning calorimeter (DSC), and a transmission electron microscope. Experimental results indicate that reducing the Cu/Mg ratio of the alloy by the further addition of Mg causes Ω to become the primary strengthening phase after aging treatment, increasing the hardness and the thermal stability, although the θ′ phase is suppressed. The S phase does not affect the thermal stability of the alloy, because it is present in only a low quantity. Results of this study also demonstrate that the hot-extruded low Cu/Mg alloy satisfies the requirement of the material thermal stability of commercial supersonic aerial applications.
UR - http://www.scopus.com/inward/record.url?scp=35848932986&partnerID=8YFLogxK
U2 - 10.1007/s11661-007-9332-1
DO - 10.1007/s11661-007-9332-1
M3 - 期刊論文
AN - SCOPUS:35848932986
SN - 1073-5623
VL - 38 A
SP - 2832
EP - 2842
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 11
ER -