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新型三元增强AA7075混杂金属基复合材料的微观结构与力学性能研究

Investigating the Microstructural and Mechanical Properties of Novel Ternary Reinforced AA7075 Hybrid Metal Matrix Composite.

作者信息

Khan Afnan Haider, Shah Syed Ahmad Ali, Umar Farheen, Noor Uneeb, Gul Rizwan Mahmood, Giasin Khaled, Aamir Muhammad

机构信息

Department of Mechanical Engineering, University of Engineering and Technology, Mardan 23200, Pakistan.

Department of Mechanical Engineering, CECOS University of IT and Emerging Sciences, Peshawar 25000, Pakistan.

出版信息

Materials (Basel). 2022 Aug 1;15(15):5303. doi: 10.3390/ma15155303.

DOI:10.3390/ma15155303
PMID:35955236
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9369724/
Abstract

This study investigates the comparison of the microstructural and mechanical properties of a novel ternary reinforced AA7075 hybrid metal matrix composite. Four samples, including AA7075 (base alloy), AA7075-5wt %SiC (MMC), AA7075-5wt %SiC-3wt %RHA (s-HMMC), and AA7075-5wt %SiC-3wt %RHA-1wt %CES (n-HMMC) were developed using the stir casting liquid metallurgy route, followed by the heat treatment. The experimental densities corresponded with the theoretical values, confirming the successful fabrication of the samples. A minimum density of 2714 kg/m was recorded for the n-HMMC. In addition, the highest porosity of 3.11% was found for n-HMMC. Furthermore, an increase of 24.4% in ultimate tensile strength and 32.8% in hardness of the n-HMMC was recorded compared to the base alloy. However, its ductility and impact strength was compromised with the lower values of 5.98% and 1.5 J, respectively. This was confirmed by microstructural analysis, which reveals that n-HMMC has mixing issues and forms agglomerates in the matrix, which served as the potential sites of stress concentration leading to low impact strength and ductility. Nevertheless, the hybrid composites showed superior mechanical properties over the MMC and its base alloy.

摘要

本研究调查了一种新型三元增强AA7075混合金属基复合材料的微观结构和力学性能的比较。使用搅拌铸造液态冶金路线制备了四个样品，包括AA7075（基体合金）、AA7075-5wt%SiC（MMC）、AA7075-5wt%SiC-3wt%RHA（s-HMMC）和AA7075-5wt%SiC-3wt%RHA-1wt%CES（n-HMMC），随后进行热处理。实验密度与理论值相符，证实了样品的成功制备。n-HMMC的最低密度记录为2714 kg/m³。此外，n-HMMC的最高孔隙率为3.11%。此外，与基体合金相比，n-HMMC的极限抗拉强度提高了24.4%，硬度提高了32.8%。然而，其延展性和冲击强度受到影响，分别为较低的值5.98%和1.5 J。微观结构分析证实了这一点，该分析表明n-HMMC存在混合问题，并在基体中形成团聚体，这些团聚体成为应力集中潜在部位，导致冲击强度和延展性较低。尽管如此，混合复合材料表现出优于MMC及其基体合金的力学性能。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/b15aa19e9228/materials-15-05303-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/6f11450634c0/materials-15-05303-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/bb9b2d602008/materials-15-05303-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/bef34d3693f2/materials-15-05303-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/f117cdf9d6a4/materials-15-05303-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/87ed1f9e288b/materials-15-05303-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/61c83e4dbbc2/materials-15-05303-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/ec33b21c5dee/materials-15-05303-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/4ffe12a60f85/materials-15-05303-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/b15aa19e9228/materials-15-05303-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/f60cc3e6e3d0/materials-15-05303-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/0b33e739bb41/materials-15-05303-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/7318d1b836ba/materials-15-05303-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/6f11450634c0/materials-15-05303-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/bb9b2d602008/materials-15-05303-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/bef34d3693f2/materials-15-05303-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/f117cdf9d6a4/materials-15-05303-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/87ed1f9e288b/materials-15-05303-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/61c83e4dbbc2/materials-15-05303-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/ec33b21c5dee/materials-15-05303-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/4ffe12a60f85/materials-15-05303-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ded4/9369724/b15aa19e9228/materials-15-05303-g012.jpg

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