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Study on the Corrosion Residual Strength of Ce Modified AZ91D Magnesium Alloy

Author: LiChunFang
Tutor: LiuYaoHui
School: Jilin University
Course: Materials Processing Engineering
Keywords: AZ91D magnesium alloy Rare earth modified Pitting Corrosion residual strength Finite Element Analysis Stress field
CLC: TG172
Type: Master's thesis
Year: 2010
Downloads: 142
Quote: 0
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Abstract


The thesis of Ce modified casting AZ91D magnesium alloy of Ce on Casting AZ91D magnesium alloy corrosion dynamic mechanical properties as the object of study , the main research reveals rare earth Ce modified AZ91D magnesium alloy corrosion dynamic changes in the mechanical properties of the mechanism . By changing the added amount of Ce ( 0.2% , 0.5% , 0.8% , 1.0% , 1.5 %) , to study the corrosion behavior of the different Ce modified AZ91D magnesium alloy , the mechanical behavior and fracture behavior of AZ91D 1.0 % Ce magnesium alloy excellent overall performance . Further research AZ91D 1.0 % Ce magnesium alloy immersed in 3.5% NaCl solution after 0,12,40,108,204,372,468 h corrosion residual strength variation found in corrosion AZ91D 1.0% Ce magnesium alloy corrosion residual strength after rapid decay , unmodified AZ91D magnesium alloy, rare earth Ce modified AZ91D magnesium alloy corrosion residual strength degradation rate was significantly reduced , the rare earth Ce significantly improve the dynamic mechanical properties of AZ91D magnesium alloy corrosion . Found by curve fitting of Ce modified AZ91D magnesium alloy corrosion residual strength over corrosion time showing a negative exponential decay law . Comprehensive analysis shows pitting caused by stress concentration and effective bearing area of ??decline is the fundamental reason of Ce modified AZ91D magnesium alloy corrosion residual strength degradation , which is the main reason for the corrosion residual strength decreased stress concentration . Of Ce modified AZ91D magnesium alloy corrosion residual strength with maximum pit depth (EDCP) was a negative linear relationship , namely : σCRS = 188.38 ? 0.12 EDCP 6.99 . Further commercial ANSYS 11.0 finite element simulation software simulation of pit corrosion of magnesium alloy stress field , and distribution of stress field of the visual representation eclipse pit . The simulation results further confirmed that the pit is the direct cause of the decline of Ce modified AZ91D magnesium alloy corrosion residual strength . The results of this study to improve the AZ91D magnesium alloy corrosion dynamic mechanical properties , and to promote the application of AZ91D magnesium alloy to improve the security of the rare earth modified AZ91D magnesium alloy important , as well as the design and use of the rare earth Ce modified AZ91D magnesium alloy theory basis.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Various types of metal corrosion
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