Investigation Of The Stress-strain Behavior Of Hot-compression Mg-li Alloy

Using Physical Simulator Gleeble3500,the stress-strain behavior of hot-compression Mg-Li alloy were investigated. The microstructure and mechanical property of the experimental alloy was analyzed.Constitutive relationship of Magnesium-lithium Alloys is the base of design and calculation of engineering. Mechanical properties of Magnesium-lithium Alloys are nonlinear. BP(back propagation)neural network can approach nonlinear function. Setting up the constitutive equation by BP neural networks, Training the flow stress prediction model with Matlab by an improved BP,the max errors is 4.27%. The curves of the prediction flow stress approximate the experimental results.The Mg-Li alloy of this paper have (α+β) phases, the texture in different temperature and different strain rates were analysis. Before the hot-compression, the textures of originality sample were analysis. To the a phase, there are{0001} parallel the surface of compress. To theβphase, there are{001} and{111} parallel the surface of base.After hot-compression, to the a phas,there are two main texture components, that is{0001}<1010> and{0001}<2110> from texture analysis. The component intensity of each texture gets weaker, with the increasing temperature. At 500℃, a recrystal texture of {1210}<0001> would be formed. To the P phase, there are two main texture components that is{111}and{110} parallel the surface of base.The component intensity of each texture gets weaker, with the increasing of temperature. At 500℃,high intensity recrystal texture of{111}<110> and {111}<112> would be formed.