Anisotropic and tensile flow behaviors of Mg alloy AZ31B thin sheet in H24 condition at elevated temperatures

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 528; no. 6; pp. 2522 - 2531
• Main Authors: Wu, Horng-yu, Sun, Pin-hou, Lin, Feng-zheng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.03.2011
• Subjects: Anisotropy; AZ31B-H24 Mg alloy; Dislocation creep; Dynamic recrystallization; Magnesium base alloys; Microstructure; Resultants; Rolling direction; Strain rate; Strain rate sensitivity; Strength; Texture; Strain rate sensitivity; Dynamic recrystallization; Anisotropy; AZ31B-H24 Mg alloy; Dislocation creep
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2010.11.082

▶ Resultant microstructures were associated with the test directions. ▶ 45° Specimens yielded higher m-value, lower strength, and greater ductility. ▶ Anisotropy influenced the onset of DRX on testing in different directions. ▶ Tensile flow behaviors were related to the variations in the microstructure changes. In this work, a series of experiments was performed to explore the effects of anisotropy, strain rate, and temperature on microstructure change and associated mechanical response of a rolled AZ31B-H24 Mg alloy sheet under tension. Tensile tests were carried out on specimens in the 0, 45, and 90° to the rolling direction, using initial strain rates in the range of 4×10−3 to 1×10−1s−1 at temperatures of 250 and 370°C. Results showed that variations in flow behavior under tension could be related to the changes in microstructure resulting from applied tensile conditions. Resultant microstructures, such as degree of dynamic recrystallization, grain growth, and shape of the grain, were associated with temperature, strain rate, and tensile loading direction. The initial texture influenced the variations in changes in microstructure and mechanical properties upon testing in different directions. The specimens upon testing in the 45° to the rolling direction yielded higher m-value, lower strength, and greater elongation to failure under all test conditions.