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Atomistic Simulation of Deformation Behavior at a Crack Tip in Magnesium Single Crystal

Author: JiangLiMing
Tutor: GuoYaFang
School: Beijing Jiaotong University
Course: Engineering Mechanics
Keywords: Molecular Dynamics Magnesium single crystal Crack Twinning Slippage
CLC: TG146.22
Type: Master's thesis
Year: 2011
Downloads: 73
Quote: 0
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Abstract


Magnesium alloy due to the low density , high specific strength and high specific stiffness and is widely used in the aerospace , automotive and other industrial fields , so to ensure its mechanical properties to meet the safety and reliability of the design . Pure magnesium and most of the magnesium alloys are close-packed hexagonal crystal , their fracture toughness values ??than the face-centered cubic and body-centered cubic metals is much lower , and therefore very important for magnesium alloy fracture . The general fracture of materials divided into macro - fracture and micro-fracture in this article from the microscopic point of view to study the fracture mechanism of magnesium alloy , and the crack propagation is closely related to the breaking strength of the crack , especially in the area of the crack tip deformation mechanism , and therefore this paper method of molecular dynamics simulation of a magnesium single crystal deformation mechanism of the crack tip , two cracks (0001 ) [ 1210 ] ( 1010 ) [ 0001 ] extension mechanism and the crack tip deformation mechanism and analysis of temperature and crack length loading on the crack propagation . The simulation results show that : the crack Marquise change twinning , slip in the form , and accompanied vacancy generation ; orientation on the crack surface crack the Marquise change mechanism great influence different crack face crack pointed transformation mechanism should be different ; temperature and loading rate of crack growth and crack tip deformation mechanism is relatively large , low-temperature and high strain rate is conducive to the generation of twins ; model taken crack length crack tip deformation mechanisms .

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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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