高体积分数定向短碳纤维增强AZ91的微观结构与力学性能

Microstructure and Mechanical Properties of AZ91 Rein-Forced with High Volume Fraction of Oriented Short Carbon Fibers.

作者信息

Ataya Sabbah, El-Sayed Seleman Mohamed M, Latief Fahamsyah H, Ahmed Mohamed M Z, Hajlaoui Khalil, Elshaghoul Yousef G Y, Habba Mohamed I A

机构信息

Department of Mechanical Engineering, College of Engineering, Imam Mohammad Ibn Saud Islamic University, Riyadh 11432, Saudi Arabia.

Department of Metallurgical and Materials Engineering, Faculty of Petroleum and Mining Engineering, Suez University, Suez 43512, Egypt.

出版信息

Materials (Basel). 2022 Jul 10;15(14):4818. doi: 10.3390/ma15144818.

DOI:10.3390/ma15144818

PMID:35888285

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9320492/

Abstract

In this study, AZ91/23 vol.% short carbon fiber composite was produced by a squeeze casting technique using a cylindrical pre-form of treated carbon fibers, in which the fibers are randomly oriented in the horizontal plane. Cylindrical specimens (height = 9 mm and diameter = 6 mm) were machined from the as-cast AZ91 matrix and its composite. The full behavior of the produced composite was studied through the test specimens machined in two directions, namely parallel to the reinforced plane (in the radial direction of the cast cylinder) and normal to the reinforced plane (in the axial direction of the cast composite). The microstructures of the produced composite specimens were investigated using SEM equipped with EDS analysis. Density, hardness, compressive, and wear behavior were also investigated. For comparison, the AZ91 matrix was evaluated as a reference. The microstructure of the produced AZ91 matrix alloy and its composite revealed dense materials without casting defects. Both composite specimens show improvement in hardness, compressive strength, and wear properties over the AZ91 matrix. The compressive and wear properties are more fiber orientation-dependent than the hardness results. The parallel composite specimen depicts the highest compressive properties in terms of yield compressive strength (311 MPa) and ultimate compressive strength (419 MPa), compared to that shown by the AZ91 matrix and the normal composite specimen. This improvement in compressive strength was at the expense of ductility. The parallel composite specimen shows the lowest ductility (R = 3.8%), compared to that given by the normal composite specimen (R = 7.1) and the AZ91 matrix alloy (R = 13.6). The wear testing results showed that at the highest wear load of 5 N, the material weight loss of the parallel composite specimen decreases by 44% and 64% compared to the AZ91 matrix and the normal composite specimen, respectively.

摘要

在本研究中，采用挤压铸造技术，使用经过处理的圆柱形碳纤维预制体（其中纤维在水平面上随机取向）制备了体积分数为91/23的AZ91短碳纤维复合材料。从铸态AZ91基体及其复合材料上加工出圆柱形试样（高度 = 9毫米，直径 = 6毫米）。通过在两个方向加工的试样来研究制备的复合材料的完整性能，这两个方向分别是平行于增强平面（沿铸态圆柱体的径向）和垂直于增强平面（沿铸态复合材料的轴向）。使用配备能谱分析的扫描电子显微镜对制备的复合材料试样的微观结构进行了研究。还研究了密度、硬度、压缩性能和磨损性能。为作比较，对AZ91基体进行了评估作为参考。制备的AZ91基体合金及其复合材料的微观结构显示材料致密，无铸造缺陷。与AZ91基体相比，两种复合材料试样在硬度、抗压强度和耐磨性能方面均有提高。抗压和耐磨性能比硬度结果更依赖于纤维取向。与AZ91基体和垂直方向的复合材料试样相比，平行方向的复合材料试样在屈服抗压强度（311兆帕）和极限抗压强度（419兆帕）方面表现出最高的抗压性能。这种抗压强度的提高是以牺牲延展性为代价的。与垂直方向的复合材料试样（延伸率 = 7.1%）和AZ91基体合金（延伸率 = 13.6%）相比，平行方向的复合材料试样显示出最低的延展性（延伸率 = 3.8%）。磨损测试结果表明，在5牛的最高磨损载荷下，平行方向的复合材料试样的材料重量损失分别比AZ91基体和垂直方向的复合材料试样减少了44%和64%。