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A Foundation Study of Superplasticity of Magnesium Alloy

Author: ChenWei
Tutor: ZhangShiChang
School: Wuhan University of Science and Technology
Course: Materials Processing Engineering
Keywords: Magnesium alloy Superplastic Instability Empty
CLC: TG146.22
Type: Master's thesis
Year: 2009
Downloads: 156
Quote: 0
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Abstract


Magnesium alloys have hexagonal close-packed crystal structure, the slip systems , the plastic deformation capacity is poor . The Superplastic is plastic an important method of magnesium alloy . AZ31 magnesium alloy , some basic problems of the alloy during superplastic deformation . Instability is a common phenomenon superplastic tensile deformation , the superplastic tensile instability and ordinary tensile instability have significantly different . Geometric instability criterion derived geometric instability constant strain rate tensile stress conditions . Experimental study on the impact of temperature and strain rate on AZ31 magnesium alloy superplastic tensile load instability and geometric instability . The results show that : load instability and geometric instability critical strain increases with the temperature increase or reduce the strain rate increased , the a geometric instability the critical strain greater than the a load instability of the critical strain . Superplastic tensile load instability does not appear immediately geometric instability , but rather through a period until uniform deformation geometric instability . The strain rate sensitivity index m is a measure of superplastic important indicators generally obtained by experiment . According to the general characteristics of superplastic tensile necking introduced a characterization of superplastic necking characteristics parameters K , and the establishment of a relationship between K and material parameters and deformation parameters used to measure the material superplasticity . Empty superplastic deformation process will inevitably produce a morphology , material superplasticity , measuring the number of voids has practical significance . The superplastic tensile work hardening and recrystallization softening in dynamic equilibrium assumptions , this paper presents a method void fraction of new material tensile curve measurements .

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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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