Microstructure evolution and effect on mechanical property in AZ80 Mg alloy during thermal processing
(1.山西省太原市北方大学材料科学与工程学院
2.湖南省长沙市中南工业大学粉末冶金研究所
3.School of Materials Science and Engineering, North University of China, Taiyuan 030051, China4.College of Materials Science and Engineering, North University of China, Taiyuan 030051, China)
2.湖南省长沙市中南工业大学粉末冶金研究所
3.School of Materials Science and Engineering, North University of China, Taiyuan 030051, China4.College of Materials Science and Engineering, North University of China, Taiyuan 030051, China)
Abstract: The microstructure and mechanical properties of AZ80 alloy were investigated during thermal processing. The samples of 4 mm in thickness machined from cast ingot were compressed at 300 ℃ with a thickness reduction of 75% and cooled in the water to room temperature. Then ageing(T5) and solution+ageing (T6) treatments were employed respectively. The results show that mechanical properties are significantly improved after thermal processing than those of as-cast AZ80 alloy due to grain refinement and discontinuous precipitates. The heat treatment has significant influence on microstructural evolution for sample formed at moderate temperature. Microstructural evaluation indicates that the β-phase increases because of sufficient solution and the alloy is strengthened evidently.
Key words: AZ80 Mg alloy; β-phase; mechanical property; thermal processing