Study On Strengthening And Toughening Mechanism And Mechanical Behavior Of Ti-al Metal Laminate

Ti-Al layered composite panels consisting of alternating arrangement of high strength titanium layer and an plastic good aluminum layer by hot- rolling from exhibit more excellent characteristics. The layered metal material that capable of binding performance advantages of the two materials make up some of the limitations of a single metal material, have good prospects. This paper focuses on the mechanical behavior of titanium layer on Ti-Al layered metal composite and strengthening and toughening mechanism. Using plastic micromechanics method preparation procedures plastic deformation process is researched. Then, the toughening mechanisms and ductile failure process is explained by using appropriate toughness failure criterion. According to the macroscopic constitutive relation of Aluminum layer plastic deformation and the defect layer theory, the strengthening and toughening mechanisms with the layer thickness ratio variation of Ti-Al layered metal composite material is explained.First, this paper introduces the basic theory crystalline, polycrystalline basic theory of plastic deformation and ductile failure criterion of metallic materials. By studying the characteristics of titanium plastic deformation experiments and titanium lattice constant, we get that the main deformation mechanism of plastic deformation effect of titanium is slip and twinning. The slip mechanism is focused researched in general numerical analysis. The plastic micromechanical model for describing polycrystalline titanium elastic-plastic deformation processes is obtained by improving Lin T H model. The plastic micromechanical model can be applied to better analyze hcp crystal plastic deformation process.The toughness failure fracture criterion of metal material b studied, by observing the experimental results a microporous gathered fracture of titanium is obtained. Taking Rice-Tracey ductile fracture model to describe the material toughness criteria vandalism the failure behavior of polycrystalline titanium is reasonable described.Then, I get the corresponding results by analyzing the uniaxial stretching process of titanium under different constraints state. using the Rice-Tracey model analysis the numerical results with different constraints state titanium uniaxial stretching, the fracture toughness values C with the strain relation is obtained. The fracture toughness values C corresponds to the same strain there will be some changes, if the constraint effects stronger, the fracture toughness values C decreases. The results show that on the stretching process of titanium sheet some form of restraint state vertical on the direction of the board have better toughening effect for its overall stretch.Finally, The constitutive relations of aluminum layer plastic deformation and defect layer model is introduced. the stress-strain relationship stretching of layered metal composite panels with different layer thickness ratio is obtained. In considering the case of a defect layer model The fracture toughness of layered metal composite panels with different layer thickness ratio is analyzed using ductile failure criterion. Within a certain range, the higher the content of the titanium layer, the influence of the defect layer reduce. The strengthening and toughening mechanisms with the layer thickness ratio variation of Ti-Al layered metal composite material is explained qualitatively.