Abstract

Magnesium has wide application in industry. The main purpose of this investigation was to improve the properties of magnesium by reinforcing it using B₄C nanoparticles. The reinforced nanocomposites were fabricated using a powder compaction technique for 0, 1.5vol%, 3vol%, 5vol%, and 10vol% of B₄C. Powder compaction was conducted using a split Hopkinson bar (SHB), drop hammer (DH), and Instron to reach different compaction loading rates. The compressive stress-strain curves of the samples were captured from quasi-static and dynamic tests carried out using an Instron and split Hopkinson pressure bar, respectively. Results revealed that, to achieve the highest improvement in ultimate strength, the contents of B₄C were 1.5vol%, 3vol%, and 3vol% for Instron, DH, and SHB, respectively. These results also indicated that the effect of compaction type on the quasi-static strength of the samples was not as significant, although its effect on the dynamic strength of the samples was remarkable. The improvement in ultimate strength obtained from the quasi-static stress-strain curves of the samples (compared to pure Mg) varied from 9.9% for DH to 24% for SHB. The dynamic strength of the samples was improved (with respect to pure Mg) by 73%, 116%, and 141% for the specimens compacted by Instron, DH, and SHB, respectively. The improvement in strength was believed to be due to strengthening mechanisms, friction, adiabatic heating, and shock waves.

中文翻译：

---

不同应变速率制备的Mg-B 4 C纳米复合材料的力学表征

摘要

镁在工业上具有广泛的应用。这项研究的主要目的是通过使用B ₄ C纳米颗粒增强镁来改善镁的性能。的增强复合材料用为0 B的粉末压实技术，1.5体积％，3体积％，5体积％，10体积和制造％₄ C.粉末压实使用分离式霍普金森杆（SHB），落锤（DH）中的溶液进行的，和Instron达到不同的压实加载速率。分别从使用Instron和霍普金森压力棒进行的准静态和动态测试中获取了样品的压缩应力-应变曲线。结果表明，为了获得最大的极限强度提高，B ₄的含量Instron，DH和SHB的C分别为1.5vol％，3vol％和3vol％。这些结果还表明，压实类型对样品的准静态强度的影响并不显着，尽管其对样品的动态强度的影响是显着的。从样品的准静态应力-应变曲线获得的极限强度的提高（与纯Mg相比）从DH的9.9％到SHB的24％不等。对于Instron，DH和SHB压实的样品，样品的动态强度（相对于纯Mg）分别提高了73％，116％和141％。认为强度的提高归因于增强机制，摩擦，绝热加热和冲击波。