Hot compression deformation behavior and processing parameters of a cast Mg–Gd–Y–Zr alloy

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2011-01, Vol.528 (3), p.1396-1401
• Main Authors: Li, Li, Zhang, Xinming
• Format: Article
• Language: English
• Subjects: Activation energy; Apparent activation energy; Applied sciences; Deformation; Elasticity. Plasticity; Exact sciences and technology; Exponents; Forming; Magnesium alloy; Magnesium base alloys; Materials science; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; Process parameters; Processing maps; Production techniques; Projectiles; Stresses; Thin walled; Uniaxial compression
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2010.10.026

▶ The apparent activation energy (Q) was calculated to be 209kJmol−1. The stress exponents (n) were measured to be 3.2 and 5.1 for the low stress region and high stress region, respectively. ▶ DRX initiated from deformation bands. ▶ Through processing-map technique, the practical processing window can be determined as 703–723K and ε˙=0.006–0.03 s−1. ▶ Utilizing the hot processing parameters, cast ingot was directly used to manufacture the thin-walled cone with excellent shape accuracy. Hot deformation behavior and processing parameters of the cast Mg–9Gd–4Y–0.6Zr alloy were investigated in this paper. For the purposes, uniaxial compression tests were conducted at the temperatures ranging from 623K to 773K and strain rates ranging from 0.001s−1 to 1s−1. The tests revealed that the apparent activation energy was 209kJmol−1, and that the stress exponents were 3.2 and 5.1 within the low stress regime and high stress regime, respectively. The processing-map technique was utilized to determine the practical processing window. The reasonable process parameters of the cast Mg–9Gd–4Y–0.6Zr alloy were deformation temperatures of 703–723K and stain rates of ε˙=0.006–0.03 s−1. Moreover, the processing parameters were applied to isothermally forging a thin-walled cone used for a projectile head shell.