Reening mechanism of laser shock wave in Al-Cu alloy at liquid nitrogen temperature

MENG Xian-kai; ZHOU Jian-zhong; TAN Wen-sheng; SU Chun; HUANG Shu

doi:10.3788/OPE.20162413.0245

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Reening mechanism of laser shock wave in Al-Cu alloy at liquid nitrogen temperature

更新时间：2020-08-13

- Reening mechanism of laser shock wave in Al-Cu alloy at liquid nitrogen temperature
- Optics and Precision Engineering Vol. 24, Issue 10s, Pages: 245-251(2016)
- 作者机构：
  
  1. 江苏大学机械工程学院,江苏镇江,212013
  2. 常州信息职业技术学院机电工程学院,江苏常州,213164
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162413.0245
  CLC： TG17
- Received：31 May 2016，
  
  Revised：12 June 2016，
  
  Published：14 November 2016
- 稿件说明：
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孟宪凯, 周建忠, 谭文胜等. 液氮温度下激光冲击波对Al-Cu合金的强化机理[J]. 光学精密工程, 2016,24(10s): 245-251

MENG Xian-kai, ZHOU Jian-zhong, TAN Wen-sheng etc. Reening mechanism of laser shock wave in Al-Cu alloy at liquid nitrogen temperature[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 245-251
孟宪凯, 周建忠, 谭文胜等. 液氮温度下激光冲击波对Al-Cu合金的强化机理[J]. 光学精密工程, 2016,24(10s): 245-251 DOI： 10.3788/OPE.20162413.0245.

MENG Xian-kai, ZHOU Jian-zhong, TAN Wen-sheng etc. Reening mechanism of laser shock wave in Al-Cu alloy at liquid nitrogen temperature[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 245-251 DOI： 10.3788/OPE.20162413.0245.

摘要

采用数值模拟与实验研究相结合的方法探索深冷激光冲击波在Al-Cu合金中的传播特性及其诱导的塑性行为。使用分子动力学软件Lammps建立了Al-Cu合金的分子动力学模型，分别在常温（293 K）以及液氮温度（77 K）下获得了激光冲击波速度与冲击波压力随粒子速度的变化规律。然后，分析了激光冲击波诱导的位错演变过程。最后对模拟结果进行了实验验证。结果表明，激光冲击波在液氮温度下的冲击波速度高达7.31 km/s，冲击波压力高达25.93 GPa，略高于常温激光冲击波；另一方面，深冷激光冲击诱导的位错结构更加稳定有序，最高位错原子数可达104 381，比常温激光冲击波增加了近30.5%。这是因为超低温环境中，Al-Cu合金具有更加稳定的FCC晶格结构，原子间距较短且原子排列均匀一致，这不仅有利于冲击波能量在晶格间的传递，使深冷激光冲击波速度与冲击波压力高于常温激光冲击波，还有利于位错的形核与扩展，进而获得较常温激光冲击更优良的表面强化效果。

Abstract

The propagation and strengthening mechanism of cryogenic laser shock in Al-Cu alloy were studied through numerical simulations and experiments. Firstly

the molecular dynamic model of Al-Cu alloy was established by Lammps software. Based on the modal

the variations of shock velocity and shock pressure respectively with particle velocity were obtained at room-temperature (293 K) and Liquid Nitrogen Temperature (LNT) (77 K). Then the evolution of dislocations induced by laser shock wave was analyzed. Finally

the simulation was proved by experiments. The results indicate that the shock velocity and pressure induced by laser shock wave at LNT are 7.31 km/s and 25.93 GPa respectively

which are greater than those at room-temperature. Moreover

the dislocations generated by cryogenic laser peening are more stable and uniform. The maximum atom number of dislocations is 104 381

which is approximately 30.5% more than that at room-temperature. The reason is that at NLT

Al-Cu alloy has better FCC lattices with short atomic spacing and uniform atoms arrangement

which not only accelerates the energy transfer between two adjacent lattices leading to the increases of the shock velocity and pressure induced by cryogenic laser peening

but also promotes the nucleation and growth of dislocations resulting in a better strengthening performance compared with cryogenic laser shock peening at room temperature.

关键词

Keywords

references

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陈开果, 祝文军, 马文. 冲击波在纳米金属铜中传播的分子动力学模拟[J]. 物理学报, 2010, 59(2):1225-1231. CHEN K G, ZHU W J, MA W. Propagation of shockwave in nanocrystalline copper molecular dynamics simulation[J]. Acta Physica Sinica, 2010, 59(2):12251231. (in Chinese)

LAMMPS Documentation manual[M/OL]. http://lammps.sandia.gov/doc/Manual.html.2013.

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