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纳米双胞胎碳化中的超硬度:一个分子动力学研究

Liping Shi¹, Hongchi Zhang¹, Xiaoliang Ma¹

¹Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China. linyang@hit.edu.cn.

Physical chemistry chemical physics : PCCP

|July 12, 2023

概括

纳米双胞胎显著增强碳化 (B4C) 陶,提高其抗冲击能力. 这项研究表明,纳米双胞胎B4C具有更高的强度和更低的脆性故障,对于先进的装甲应用至关重要.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
机械工程机械工程

背景情况:

碳化物 (B4C) 陶由于其低密度,对防弹盔甲有很大的希望.
在超高速撞击时异常脆性失效限制了B4C的应用.
纳米双胞胎在B4C的机械性质中的作用仍然不清楚,尽管它们已知在金属中的强化作用.

研究的目的:

为了研究纳米级双胞胎对碳化物陶的机械性能的影响.
了解纳米双胞胎如何影响B4C对冲击和痕的反应.

主要方法:

使用了古典分子动力学模拟.
模拟专注于分析在机械应力下纳米化碳化的行为.

主要成果:

引入纳米双胞胎使B4C的剪切强度极限增加了19.72%.
纳米双胞胎减少了无形化,并缩小了无形剪切带宽.
在缩下,纳米双胞胎将压力剪切强度极限提高了15.97%并改变了无形剪切带的形成.

结论:

双边界有效地阻碍了B4C中的无形剪切带的扩张.
纳米双胞胎提供了一种新的设计策略,以增强碳化陶的抗冲击性能.
这项研究为缓解B4C装甲中异常脆性故障提供了一条途径.

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