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Dynamic response of high-entropy alloys to ballistic impact
Science Advances ( IF 13.6 ) Pub Date : 2022-08-12 , DOI: 10.1126/sciadv.abp9096
Yunqing Tang 1 , D Y Li 1
Affiliation  

High-entropy alloys (HEAs) are promising to provide effective antiballistic capability because of their superior mechanical properties. However, the twinning-active Cantor alloy is found less ballistic resistant, compared with its Mn-free companion. It is unclear how the HEAs resist ballistic impact and why Mn does not benefit the ballistic resistance. Here, we used molecular dynamics simulations to investigate the ballistic resistances of CrMnFeCoNi and CrFeCoNi and elucidate underlying mechanisms. It is shown that the alloys’ ballistic resistances dominantly benefit from active dislocations generated at higher strain rates. Stronger atomic bonding and higher dislocation densities make the CrFeCoNi easier to be strain hardened with elevated toughness to resist high-speed deformation, while weaker atomic bonding and easier occurrence of dislocation tangling make CrMnFeCoNi less resistant to failure under ballistic impact. This work helps better understand the antiballistic behavior of HEAs and guide the design of armor and energy-absorption materials.

中文翻译:

高熵合金对弹道冲击的动态响应

高熵合金 (HEAs) 有望提供有效的防弹能力,因为它们具有优异的机械性能。然而,与不含 Mn 的伙伴相比,孪晶活性 Cantor 合金的防弹性较差。目前尚不清楚 HEA 如何抵抗弹道冲击以及为什么 Mn 不利于弹道阻力。在这里,我们使用分子动力学模拟来研究 CrMnFeCoNi 和 CrFeCoNi 的弹道阻力并阐明潜在的机制。结果表明,合金的弹道阻力主要受益于在较高应变率下产生的活性位错。更强的原子键合和更高的位错密度使CrFeCoNi更易于应变硬化,具有更高的韧性以抵抗高速变形,而较弱的原子键合和更容易发生位错缠结使CrMnFeCoNi在弹道冲击下的抗破坏能力降低。这项工作有助于更好地了解 HEA 的反弹行为,并指导装甲和能量吸收材料的设计。
更新日期:2022-08-12
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