Effect of Gd on Microstructure and Fracture Behavior of AZ91 Magnesium Alloy

4th Annual International Workshop on Materials Science and Engineering

Li, Yao^1 ; Yang, Junjie^1 ; Wang, Huiling^1

School of Electromechanical and Architectural Engineering, Jianghan University, Wuhan, Hubei

430056, China^1

关键词: AZ91 magnesium alloys;    Fracture behavior;    Fracture surfaces;    Magnesium alloy AZ91;    Mechanical properties testing;    Plastic fracture;    Quasi cleavage fracture;    Tensile fractures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/381/1/012177/pdf
DOI  :  10.1088/1757-899X/381/1/012177

来源: IOP

【 摘 要 】

Alloy was prepared by adding Rare Earth (RE) elements Gd in AZ91 Magnesium alloy. With Optical Micro-scope, Scanning Electron Microscope, X-ray diffraction analysis and mechanical properties testing equipment, the paper explored the influence of RE element Gd with different content on microstructure and fracture behavior of as-cast AZ91 Magnesium al-loy. The results show that the addition of RE element Gd in Magnesium alloy AZ91 can refine grain, make β-Mg17Al12 phase become a discontinuous network or punctate structure, and generate granular particulate Al2Gd in the alloy. With the increase of the content of Gd, tensile strength, elongation and hardness of the alloy showed a gradually increasing trend. The tensile fracture of AZ91 magnesium alloy at room temperature was obvious tearing pattern of river pattern, which shows that it is dominant of cleavage brittle fracture. After adding a certain amount of Gd, the plasticity of the alloy has been improved, and the dimple and tearing edges begin to appear on the fracture surface, which show the features of quasi cleavage fracture and plastic fracture.