Microstructure and Mechanical Properties of Tortoise Carapace Structure Bio-Inspired Hybrid Composite

doi:10.1007/s40195-018-0727-3

Abstract

Abstract:

A turtle carapace bio-inspired Ti matrix hybrid composite was successfully fabricated in this work. This composite incorporates two parts: the Ti-Al intermetallic multilayered composite and continuous SiC fibers-reinforced Ti matrix composite. In the Ti-Al intermetallic multilayered composite part, a series of Ti-Al intermetallics compounds, including Ti₃Al, TiAl, TiAl₂ and TiAl₃, were formed between the Ti layers. In the continuous SiC fibers-reinforced Ti matrix composite part, SiC fibers and Ti matrix were found to be bonded well through weak interface reaction. Flexural strength of this material reached 1.21±0.16 GPa, measured by three-point bending test. The deformation features suggest that the hierarchical structure combining ductile Ti layers/matrix with brittle high-strength Ti-Al intermetallics layers/SiC fibers can effectively enhance the mechanical properties of the bio-inspired hybrid composite.

Key words: Bio-inspired composite, Hierarchical structure, Cracks propagation, Flexural property

Bao-Shuai Han, Yan-Jin Xu, En-Yu Guo, Tao Jing, Hong-Liang Hou, Liang-Shun Luo. Microstructure and Mechanical Properties of Tortoise Carapace Structure Bio-Inspired Hybrid Composite[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(9): 945-952.

Figures/Tables 8

Fig. 1 -sectional structure of turtle carapace.

Fig. 2 Schematic of a the components stacking sequence, b the processing route to fabricate the hybrid composite by hot-pressing sintering.

Fig. 3 Microstructure of the bio-inspired hybrid composite: a section; b local magnified regions showing the Ti-Al intermetallic multilayered part; SiC fibers-reinforced Ti matrix part in the c and d longitudinal sections.

Fig. 4 Interface reaction in the bio-inspired hybrid composite: a XRD result; b SEM image and element distributions ing the phases of the Ti-Al intermetallic multilayers; c SEM image showing the morphology of a SiC fiber and Ti matrix; d elements distribution in the SiC fiber and Ti matrix.

Table 1 EDS points analysis corresponding to Fig. 4b

	Spot A (%)	Spot B (%)	Spot C (%)	Spot D (%)	Spot E (%)
Al	1.66	25.19	46.73	67.05	74.43
Ti	98.34	74.81	53.27	32.95	25.57
Phase	Ti	Ti₃Al	TiAl	TiAl₂	TiAl₃

Fig. 5 Typical stress-strain curve of the bio-inspired hybrid composite in the three-point bending test.

Fig. 6 Morphology and the main cracks propagation of the bio-inspired hybrid composite: a overall SEM image; magnified SEM images of b area I, c area II, d area III in a, respectively.

Fig. 7 Fractured surfaces of the bio-inspired hybrid composite after three-point bending test: a SEM image showing the overall morphology of the fractured surface; magnified images showing the fracture morphologies of b Ti-Al intermetallic multilayered composite, c SiC fibers-reinforced Ti matrix composite, respectively.

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