木对微观结构演化的影响和造过程中单晶Fe的特性:一个分子动力学研究
Menghui Liu1, Fazhan Wang2, Yuan Fan1
1School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
Journal of molecular modeling
|December 18, 2024
概括
钢中的木纳米颗粒通过变形来减少滚动力和应力,阻碍局部增强的脱位运动. 增加滚动深度通常会增加力和应力,但Bi粒子的行为会产生变量效应.
科学领域:
- 材料科学 材料科学 材料科学
- 计算材料科学科学 计算材料科学
- 机械工程 机械工程
背景情况:
- 含 (Bi) 的自由切割钢在材料加工中至关重要.
- 研究生物纳米粒子在纳米轮过程中对铁 (Fe) 的影响是关键.
- 了解纳米粒子对结构演变和机械性能的影响是必不可少的.
研究的目的:
- 通过分子动力学 (MD) 模拟,研究石纳米颗粒在纳米滚动过程中对单晶Fe的影响.
- 分析不同滚动深度对材料在生物纳米颗粒存在时的反应的影响.
- 阐明生物纳米颗粒对滚动力,应力分布和位移动态的影响.
主要方法:
- 分子动力学 (MD) 模拟使用大型原子/分子大规模并行模拟器 (LAMMPS) 进行.
- 经典力场描述了原子间相互作用,模拟时间步骤为1 fs.
- Atomsk软件构建了合金模型,OVITO软件用于数据分析.
主要成果:
- 生物纳米颗粒显著影响滚动力,应力分布和脱位生成/传播.
- 变形Bi粒子减少了滚动力和·米塞斯应力,同时阻碍了脱位运动,导致局部增强.
- 滚动深度的增加通常会增加总滚动力,摩擦系数和·米塞斯应力,在Bi粒子区域具有可变的影响.
结论:
- 石纳米颗粒在纳米滚动过程中对改变铁的机械行为起着至关重要的作用.
- 在不同的滚动深度下,Bi颗粒的变形和结构演变会对材料特性产生复杂的影响.
- 模拟MD提供了宝贵的洞察力,纳米机制控制Bi-含有自由切割钢的性能.
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