Enhanced Performance of Mg (AZ91) Composites with Nano B4C: A Comprehensive Study of Microstructure, Mechanical Properties, Acoustic Emission and Thermogravimetric Analysis

IF 1.6 4区 材料科学 Q2 Materials Science
M. Navaneetha Krishnan, S. Suresh, C. Emmy Prema
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Abstract

The electromagnetic frequency high-energy stir casting process was used to create the high-quality magnesium (Mg) dispersed with varied percentages of nano-sized B4C (0, 0.5, 1 and 1.5 wt%). The shape and distribution of Mg with nano B4C were validated by characterization research on nanocomposites utilizing energy-dispersive spectrum, scanning electron microscope and X-ray diffraction. Thermal and mechanical characteristics such as thermogravimetric analysis/differential thermal analysis and tensile strength were explored utilizing acoustic emission. During a tensile test, online monitoring using acoustic emission (AE) demonstrates a reduction in fracture development and propagation. The tensile test result exhibits that, Mg-1.5% B4C nanocomposite has a better tensile strength (σultimate = 125 MPa) than the Mg-0.5% B4C nanocomposite (σultimate = 115 MPa). AE results show that the hit begins at 26 µs for Mg-1.5% B4C nanocomposite, whereas for Mg-0.5% B4C nanocomposite, it begins at 14 µs. Thus, AE results show that an increase in B4C nanoparticles in the composites will prevent hits from occurring. The SEM and atomic force microscopy analyses were performed on the tensile-tested specimens to find the distinguishing characteristics. Owing to the inclusion of the B4C, the Mg-1.5% nano B4C composite has a longer ignition time in the thermogram of TGA and greater tensile strength than the Mg.

Abstract Image

纳米 B4C 增强镁 (AZ91) 复合材料的性能:显微结构、力学性能、声发射和热重分析的综合研究
利用电磁频率高能搅拌铸造工艺制造出了分散有不同比例纳米 B4C(0、0.5、1 和 1.5 wt%)的优质镁(Mg)。通过利用能量色散光谱、扫描电子显微镜和 X 射线衍射对纳米复合材料进行表征研究,验证了镁与纳米 B4C 的形状和分布。热重分析/差热分析和拉伸强度等热特性和机械特性则是利用声发射进行的。在拉伸试验过程中,利用声发射(AE)进行的在线监测表明,断裂的发展和传播有所减少。拉伸试验结果表明,Mg-1.5% B4C 纳米复合材料的拉伸强度(σultimate = 125 MPa)优于 Mg-0.5% B4C 纳米复合材料(σultimate = 115 MPa)。AE 结果表明,Mg-1.5% B4C 纳米复合材料在 26 µs 时开始发生撞击,而 Mg-0.5% B4C 纳米复合材料在 14 µs 时开始发生撞击。因此,AE 结果表明,复合材料中 B4C 纳米粒子的增加可防止撞击的发生。对拉伸试验的试样进行了扫描电镜和原子力显微镜分析,以发现其显著特征。由于加入了 B4C,Mg-1.5% 纳米 B4C 复合材料在 TGA 热图中的点火时间比 Mg 复合材料长,拉伸强度比 Mg 复合材料大。
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来源期刊
Transactions of The Indian Institute of Metals
Transactions of The Indian Institute of Metals Materials Science-Metals and Alloys
CiteScore
2.60
自引率
6.20%
发文量
3
期刊介绍: Transactions of the Indian Institute of Metals publishes original research articles and reviews on ferrous and non-ferrous process metallurgy, structural and functional materials development, physical, chemical and mechanical metallurgy, welding science and technology, metal forming, particulate technologies, surface engineering, characterization of materials, thermodynamics and kinetics, materials modelling and other allied branches of Metallurgy and Materials Engineering. Transactions of the Indian Institute of Metals also serves as a forum for rapid publication of recent advances in all the branches of Metallurgy and Materials Engineering. The technical content of the journal is scrutinized by the Editorial Board composed of experts from various disciplines of Metallurgy and Materials Engineering. Editorial Advisory Board provides valuable advice on technical matters related to the publication of Transactions.
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