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Investigation of the Stress-Strain Behavior of Hot-compression Mg-Li Alloy

Author: LiQunXia
Tutor: GaiDengYu
School: Harbin Engineering University
Course: Materials Processing Engineering
Keywords: Thermal simulation Mg-Li alloy Constitutive relations BP neural network Texture
CLC: TG146.22
Type: Master's thesis
Year: 2009
Downloads: 75
Quote: 1
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Abstract


The use of Gleeble3500 thermal simulation machine hot deformation of a Mg-Li alloy . Draw the curve of the flow stress and the mechanical properties of the alloy and heat distortion organization . Mg-Li alloy constitutive model is designed for processing . The traditional constitutive model are based on experimental results , in accordance with the different mathematical models and nonlinear systems there are some limitations . Artificial neural network model can be directly extracted from the experimental data , can approximate any nonlinear function . BP neural network to predict the flow stress of Mg-Li alloy , the use of improved BP algorithm Using MATLAB software training flow stress model to get a better flow stress curve . The predicted results are compared with experimental results , the error is less than 4.27% , reaching engineering requirements . Mg-Li alloy is studied in this paper ( alpha beta ) two-phase structure , its texture evolution analysis is to study the two phase texture changes . Original sample to generate alpha relative to the { 0001} plane parallel to the sample the compression surface texture . p relative to the { 001} and { 111} parallel to the base surface texture . Thermal deformation , for the alpha phase , mainly generated { 0001 } lt ; 1010 GT ; { 0001 } lt ; 2110 GT ; texture , they are reduced or completely disappear as the temperature increases . Generated when the deformation temperature reaches 500 ° C , recrystallization texture { 1210 } lt ; 0001 gt ; For p - phase texture of {111} and { 110} parallel to the plate surface texture , they are weakened with increasing temperature , when deformation temperature reached 500 ° C when they produce a very high intensity of the {111 } lt ; 110 GT ; and { 111 } lt ; 112 GT ; recrystallization texture . Generally speaking , in the case of a large rate of deformation , the texture strength is generally very large , when the deformation rate is reduced to a certain extent , the texture strength is reduced to almost negligible .

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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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