Processing maps of extruded AZ80+0.4% Ce magnesium alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:844

Article

Yang, Yongbiao¹  Qin, Qinfeng²  Zhang, Zhimin¹  Wang, Qiang¹  Meng, Mu¹  Liang, Min-jie¹  Hu, Henry³ 

[1] North Univ China, Mat Sci & Engn Dept, Coll Mat Sci & Engn, Lane 3,Xueyuan Rd, Taiyuan 030051, Shanxi, Peoples R China

[2] North Univ China, Coll Environm & Safety Engn, Taiyuan 030051, Peoples R China

[3] Univ Windsor, Dept Mech Automot & Mat Engn, 401 Sunset Ave, Windsor, ON N9B 3P4, Canada

关键词: AZ80+0.4%Ce magnesium alloy;    Hot deformation;    Processing maps;    Anisotropic;    Texture;   

DOI  :  10.1016/j.jallcom.2020.156064

来源: Elsevier

【 摘 要 】

Hot deformation behaviors of the extruded AZ80 + 0.4% Ce magnesium alloy plate were investigated in the temperature range of 300-420 degrees C and strain rate range of 0.0005-0.5 s(-1) by using a Gleeble 3500 thermal simulation test machine. The cylindrical specimens for hot compression tests were cut in 0 degrees, 45 degrees and 90 degrees to the extruded direction of the plate, respectively. The microstructure analysis was carried out with optical microscopy (OM), X-ray diffractometry (XRD) and scanning electronic microscopy (SEM). The results showed that the flow stresses of the 0 degrees, 45 degrees and 90 degrees specimens exhibited anisotropic behaviors, which weakened with increasing temperatures, strains, and decreasing strain rates. The processing maps of different specimens were calculated and analyzed according to the dynamic materials model. The optimized stability domains for all the three specimens were in the temperature range of 380 -420 degrees C and strain rate range of 0.0005-0.005 s(-1), while the instability domains varied with specimen orientations. The apparent activation energy of the 0 degrees, 45 degrees and 90 degrees specimens were 154.45 kJ/mol, 129.16 kJ/mol and 145.97 kJ/mol, respectively, suggesting the change of deformation mechanisms with specimen orientations. The operation of different slip systems, which were indicated by the varying values of the Schmid factor, should be responsible for the anisotropic hot deformation behaviors for the extruded AZ80 + 0.4%Ce magnesium alloy plate with basal texture. (C) 2020 Elsevier B.V. All rights reserved.

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