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The Study on the Dynamic Recrystallization Behaviors and the Superplastic Behaviors for AZ80 Magnesium Alloy

Author: YangMing
Tutor: YangYongShun
School: Henan University of Science and Technology
Course: Materials processing
Keywords: Magnesium alloy Dynamic recrystallization Tissue simulating Superplastic
CLC: TG146.22
Type: Master's thesis
Year: 2011
Downloads: 127
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Abstract


Magnesium alloy with good thermal conductivity, low density, than the strength and stiffness advantages known as the \widely used in aviation, aerospace, automotive, electronics and other fields. However, due to the magnesium belongs to the close-packed hexagonal crystal structure, less slip systems, leading to poor plastic forming ability. The use of superplastic forming techniques can improve its formability, superplastic magnesium alloy technology in recent years, more and more extensive study of superplastic behavior of magnesium alloy magnesium alloy plastic processing technology will help to improve and promote China's magnesium the alloy processing industry development. However, the metal needs to achieve organizational superplastic fine equiaxed grain structure. Magnesium belong to the low stacking fault energy material, prone to dynamic recrystallization during hot deformation, using dynamic recrystallization of deformed grain recovery and refining effect can superplastic organization required state. Well, you asked us to not only study, but also to the magnesium alloy superplastic behavior of magnesium alloy dynamic recrystallization behavior understanding. Study magnesium alloy dynamic recrystallization behavior can provide a basis for improved superplastic magnesium alloy pretreatment. In this paper, the dynamic recrystallization behavior of magnesium alloy will be the superplastic behavior combined joint research, to provide a reference for the development of thermal processing of magnesium alloy. First, the use of the Gleeble-1500 of multifunctional thermal simulation testing machine AZ80 magnesium alloy under different deformation conditions isothermal compression test, found through the study of the alloy under different deformation conditions of dynamic recrystallization behavior, the higher the deformation temperature, strain rate lower, dynamic recrystallization more easily, while the finally obtained grain size is larger. However, in order to more accurately predict the evolution of the organization AZ80 magnesium alloy hot deformation process by means of thermodynamic analysis of AZ80 magnesium alloy dynamic recrystallization mathematical model and numerical simulation of AZ80 magnesium alloy during hot deformation organizational evolution prediction. AZ80 magnesium alloy samples within the dynamic recrystallization fraction and grain size distribution, compared with the actual sample, indicating that the Deform software can more accurately predict the thermal deformation process of organizational evolution. By compressional deformation AZ80 magnesium alloy grain refinement and superplasticity experiments provide a good organization of the state. Superplastic deformation test, AZ80 magnesium alloy extruded through tensile testing machine, multi-function,, AG-I250kN, Shimadzu, superplastic tensile testing and analysis of its mechanism of deformation and fracture type superplastic state. The results showed that: in the deformation temperature of 623K, and the deformation speed of 0.001mm / s, the maximum elongation of the alloy AZ80 magnesium reached 450.53% superplastic mechanism for the dynamic recrystallization auxiliary grain boundary sliding.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Magnesium
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