Deformation behavior and microstructure of an Al-Zn-Mg-Cu-Zr alloy during hot deformation

• Published in: International journal of minerals, metallurgy and materials Vol. 17; no. 1; pp. 46 - 52
• Main Authors: Yan, Liang-ming, Shen, Jian, Li, Jun-peng, Li, Zhou-bing, Yan, Xiao-dong
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.02.2010; Springer Nature B.V; General Research Institute for Nonferrous Metals,Beijing 1013088,China
• Subjects: 7055铝合金; ACTIVATION ENERGY; Aluminum; ALUMINUM ALLOYS (50 TO 99 AL); Aluminum base alloys; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Constitutive equations; Constitutive relationships; Corrosion and Coatings; DEFORMATION; Glass; Hot forming; Hot pressing; Magnesium; Materials Science; MATHEMATICAL ANALYSIS; Metallic Materials; Microstructure; MICROSTRUCTURES; Natural Materials; Strain; STRAIN RATE; Surfaces and Interfaces; Thin Films; TRANSMISSION ELECTRON MICROSCOPY; Tribology; Yield strength; Zirconium base alloys; 变形过程; 微观结构; 本构方程; 热变形激活能; 热变形行为; 透射电子显微镜; 锆合金; deformation behavior; hot compression; constitutive equation; dynamic recovery; aluminum alloys
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-010-0108-z

The hot deformation behavior and microstructures of Al-7055 commercial alloy were investigated by axisymmetric hot compres- sion at temperatures ranging from 300℃ to 450℃ and strain rates from 10^-2 to 10 s^-1, respectively. Microstructures of deformed 7055 alloy were investigated by transmission electron microscopy （TEM）. The dependence of peak stress on deformation temperature and strain rate can be expressed by the hyperbolic-sine type equation. The hot deformation activation energy of the alloy is 146 kJ/mol. Moreover, the flow stress curves predicted by the modified constitutive equations are reasonably consistent with the experimental results, which confirms that the proposed deformation constitutive equations can provide evidence for the selection of hot forming parameters. TEM results indicate that dy- namic recovery is the main softening mechanism during hot deformation.