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Monte Carlo Simulation of the Interaction between Dislocation and Solute Atoms in Plastic Deformation of Alloys

Author: HeYanSheng
Tutor: ChenZhongJia
School: Hefei University of Technology
Course: Materials Processing Engineering
Keywords: Solute atoms Dislocation Applied stress Solute concentration Volume expansion Serrated yielding effect
CLC: TG131
Type: Master's thesis
Year: 2009
Downloads: 110
Quote: 1
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Abstract


The interaction of dislocations with solute atoms lot of influence of macroscopic mechanical behavior of the alloy material , the interactions between of microscopic dislocations and solute atoms also affect the deformation of the alloy material . With the development of the automotive industry and automotive lightweighting required urgently , yield impact plastic formability of aluminum alloy serrated effect research is very important . To study the interaction of dislocations and solute atoms , lay a theoretical basis for the microscopic characteristics of the physical quantity of the alloy material and its macroscopic mechanical behavior of convergence . Dynamic Monte Carlo methods , from the microscopic point of use to simulate a single edge dislocation and displacement of the interaction between the solute atoms , the main content is as follows : 1 . Use of dynamic Monte Carlo model , two limiting cases ( dislocations always stationary and solute concentration is zero ) simulation . When the dislocation is always stationary analog form Cottrell air mass at the center of the dislocation , away from the center of the solute cloud formation , but also examine the feasibility of the simulation . 2. Dynamic simulation assumes that there is no interaction between the solute atoms , to obtain the distribution state of the movement of dislocations in the different applied stress characteristics and the solute atoms . The results showed that the smaller applied stress , the movement of dislocations by solute atoms hysteresis easily pinning ; larger applied stress , dislocation motion substantially independent of solute atoms ; while medium stress dislocation movement state ambiguity, the speed level to jump appears . 3 . Concentration of solute atoms and solute atoms volume expansion of dislocation movement speed and critical off nail stress . The results show that as the concentration of solute atoms and the change of volume expansion , the speed of movement of dislocations exist high - speed and low-speed two branches ; dislocations critical off nail stress values ??increase with the increase in concentration of solute atoms and volume expansion . When considering the interaction between the solute atoms analysis of melting - melting effect on the distribution of solute atoms in static simulation and dynamic simulation of dislocation motion characteristics . Simulation results reflect the dislocation pinning and nail removal phenomenon coexistence of yield effect laid the foundation for in-depth study from the microscopic point serrated .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Alloy theory
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