激光温喷丸诱发单晶铜位错扩展的分子动力学模拟

发布时间：2019-05-17 04:06

【摘要】：为了研究面心立方金属在热力耦合作用下的微观组织,采用分子动力学方法对激光温喷丸在单晶铜内诱导的位错扩展进行了模拟,并使用中心对称参数研究了变形量对位错扩展的影响规律,以及温度对塑性变形诱导位错扩展的作用,进而从加工硬化的角度分析了其对激光温喷丸强化效果的影响。结果表明,激光温喷丸过程中,塑性变形以"空位簇-不全位错-堆垛层错"的方式诱导产生不全位错与堆垛层错。随塑性变形增加,激光温喷丸的硬化效果逐渐增加。并且,温度可以促进塑性变形过程中位错的形核与扩展,200℃以内,激光温喷丸的硬化效果随温度的增加而增强,温度增至250℃时,硬化效果由于位错湮灭而减弱。
[Abstract]:In order to study the microstructure of face-centered cubic metal under thermal coupling, the dislocation propagation induced by laser warm shot peening in single crystal copper was simulated by molecular dynamics method. The influence of deformation on dislocation propagation and the effect of temperature on dislocation propagation induced by plastic deformation are studied by using central symmetry parameters, and then the effect of temperature on laser warm shot peening strengthening is analyzed from the point of view of working hardening. The results show that incomplete dislocation and stacking fault are induced by "vacancy cluster-incomplete dislocation-stacking fault" in the process of laser warm shot peening. With the increase of plastic deformation, the hardening effect of laser warm shot peening increases gradually. Moreover, temperature can promote the nucleation and expansion of dislocations in the process of plastic deformation. Within 200 鈩，

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