Microstructure and mechanical properties investigation of in situ TiB2 and ZrB2 reinforced Al-4Cu composites

2nd International Manufacturing Engineering Conference; 3rd Asia-Pacific Conference on Manufacturing Systems

Anis, Ahmad Lutfi^1 ; Ramli, Rosmamuhammadani^1 ; Darham, Widyani^1 ; Zakaria, Azlan^1 ; Talari, Mahesh Kumar^1

Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam

40450, Malaysia^1

关键词: Al based composite;    Dispersion strengthening;    Fracture propagation;    Interfacial bonding;    Microstructure and mechanical properties;    Phase distribution;    Reinforcement particles;    Tensile fracture morphology;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/114/1/012120/pdf
DOI  :  10.1088/1757-899X/114/1/012120

来源: IOP

【 摘 要 】

Conventional Al-Cu alloys exhibit coarse grain structure leading to inferior mechanical properties in as-cast condition. Expensive thermo-mechanical treatments are needed to improve microstructure and corresponding mechanical properties. In situ Al-based composites were developed to improve mechanical properties by dispersion strengthening and grain refinement obtained by the presence of particulates in the melt during solidification. In this work Al-4Cu - 3TiB2and Al-4Cu-3ZrB2in situ composites were prepared by liquid casting method. XRD, electron microscopy and mechanical tests were performed on suitably sectioned and metallographically prepared surfaces to investigate the phase distribution, hardness and tensile properties. It was found that the reinforcement particles were segregated along the grain boundaries of Al dendrites. Tensile fracture morphology for both Al-4Cu - 3TiB2and Al-4Cu-3ZrB2were analyzed and compared to determine the fracture propagation mechanism in the composites. Al-4Cu-3ZrB2in situ composites displayed higher strength and hardness compared to Al-4Cu-3TiB2which could be ascribed to the stronger interfacial bonding between the Al dendrites and ZrB2particulates as evidenced from fractographs.