Microstructure and creep behavior of in situ SiO2/Al composites produced with different size precursors. Issue 12 (2nd December 2021)

• Record Type: Journal Article
• Authors: Tang, Peng; Yu, Fengyang; Teng, Xiaodan; Peng, Linxin
• Is Part Of: Composite interfaces. Volume 28:Issue 12(2021)
• Page Start: 1257
• Page End: 1279
• Publication Date: 2021-12-02
• Subjects: Aluminum matrix composites -- creep behavior -- sio2-Al -- in-situ reaction -- particle size; Composite materials -- Periodicals; 620.11805
• DOI: 10.1080/09276440.2021.1874743
• Languages: English
• ISSNs: 0927-6440

Abstract

ABSTRACT: As heat-resistant and wear-resistant materials, the aluminum matrix composites based on in-situ SiO2 -Al reaction need to be systematically studied at high temperature. In this research, the SiO2 precursor particles with the average diameters of 'D = 30 μm and 'D = 250 μm were used to study the microstructures and creep behavior of the aluminum matrix composites. Unlike the AMCS particle-reinforced structure of D = 30 μm precursor, the sandwich structure reinforced by SiO2 core and Al2 O3 layer was found in AMCS of D = 250 μm n precursor. The formation mechanism of these two microstructures could be rationalized by concerning the reaction kinetics. The creep resistance of the composite sample with d = 30 μm precursor was more excellent than that of the sample with d = 250 μm precursor. According to the threshold analysis for these composites, the correlation between creep strains rate and the effective stress could be rationalized by a true stress exponent of 3, suggesting the creeping mode of these composites was viscous to glide of dislocation. Graphical abstract: uf0001