Phase Evolution - Property Relationships of PIMed 5 - 40 Vol.% SiCp - Reinforced Aluminium Composite

2019 2nd International Conference on Composite Materials Science and Technology

Patcharawit, Tapany^1 ; Ngeekoh, Arada^1 ; Chuankrerkkul, Nutthita^2

School of Metallurgical Engineering, Suranaree University of Technology, 111 University Avenue, Suranaree Subdistrict, Meung, Nakhon Ratchasima

30000, Thailand^1

Metallurgy and Materials Science Research Institute, Chulalongkorn University, Phayatai Rd., Pathumwan, Bangkok

10330, Thailand^2

关键词: Aluminium composites;    Composite microstructures;    Endothermic reactions;    Liquid phase formation;    Microstructure mechanical properties;    Phase evolutions;    Powder injection molding;    properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/600/1/012014/pdf
DOI  :  10.1088/1757-899X/600/1/012014

来源: IOP

【 摘 要 】

Microstructure-mechanical property relationships of powder injection molded aluminium composite reinforced with 5-40 vol.% silicon carbide particulate (SiCp) has been investigated via thermal and phase analyses along with density and hardness testing. The samples were injection molded and sintered at 645-800 °C in N2 atmosphere. Thermal analysis showed endothermic reactions around 632-643 °C, related to liquid phase formation. Exothermic reactions about 458-461 °C and weight gains around 471-479 °C were plausibly associated with AlN formation, which facilitated liquid phase sintering. The composite microstructure exhibited close interfaces between SiCp-Al and Al-Al for 5-20 vol.% SiCp addition. Higher SiCp addition however led to SiCp clustering, creating large pores and unreacted SiCp-SiCp interface, which prohibited both liquid flow and rearrangement of the solid grains and pore filling during liquid phase sintering. Optimum SiCp addition was achieved at 15 vol.%, giving the maximum bulk density at 2.68 g.cm-3 or at 94.2 % theoretical density. The maximum macro Vickers hardness values at 138.9 and 166.6 Hv were obtained in the as-sintered and age-hardened conditions respectively.