Bioinspired design and toughening mechanism of the TC4-(γ-TiAl/α2-Ti3Al) laminated composite fabricated by spark plasma sintering

•TC4-(TiAl/Ti3Al) lamellar composite with brick-and-mortar architectures was obtained.•Bioinspired structure design adjusted the performance of the sheet.•Lamellar structure had an important influence on the resistance of crack propagation. Inspired by nature, new bioinspired TC4-(γ-TiAl/α2-Ti3Al) l...

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Bibliographic Details
Published in:Materials letters 2020-08, Vol.273, p.127965, Article 127965
Main Authors: Taotao, Ai, Zhifeng, Deng, Wenhu, Li, Hongfeng, Dong, Xiangyu, Zou, Ran, Jing
Format: Article
Language:English
Subjects:
Biomimetics
Crack propagation
Flexural strength
Fracture behavior
Fracture toughness
Intermetallic
Intermetallic compounds
Laminar composites
Laminated composite
Laminates
Materials science
Mechanical properties
Microstructure
Nacre
Plasma sintering
Room temperature
Sintering
Spark plasma sintering
Titanium alloys
Titanium aluminides
Titanium base alloys
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Summary:•TC4-(TiAl/Ti3Al) lamellar composite with brick-and-mortar architectures was obtained.•Bioinspired structure design adjusted the performance of the sheet.•Lamellar structure had an important influence on the resistance of crack propagation. Inspired by nature, new bioinspired TC4-(γ-TiAl/α2-Ti3Al) laminated composite with nacre-mimetic lamellar and brick-and-mortar architectures was fabricated by spark plasma sintering for the first time. The results indicated that the composite displayed a unique micro-laminated structure, composing of alternating γ-TiAl/α2-Ti3Al duplex phase alloy layer and TC4 titanium alloy layer. The composite showed a significant increase in fracture toughness while maintaining appropriate flexural strength at room temperature. Bioinspired design played an important role in toughening by complicated crack propagation, interconnecting structure, and synergistic effects of layers.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.127965