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Synthesis and Fracture Characteristics of TiB2-TiAl Composites with a Unique Microlaminated Architecture

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Abstract

Microstructural evolution of as-rolled (TiB2/Al)-Ti laminates in the process of multistep heat treatments and microstructural characteristics of the resulting TiB2-TiAl composites were investigated in detail by scanning electron microscope (SEM) and transmission electron microscope. The desired TiB2-TiAl composites exhibited a unique microlaminated structure consisting of alternating fully lamellar α2-Ti3Al/γ-TiAl layers and TiB2-rich layers. Moreover, the formation mechanism of the microlaminated structure was elucidated. It is noteworthy that the TiB2-TiAl composites showed improved high-temperature tensile properties and room-temperature fracture toughness due to the strengthening effect of TiB2 particles and the structure effect of the unique microlaminated microstructure. In addition, the fracture behavior of the microlaminated TiB2-TiAl composites during the dynamic tensile was characterized by combining use of the three-dimensional X-ray microscope (3D-XRM) and SEM. The results indicated that pores and cracks preferred to initiate in the brittle TiB2-rich layer and showed a typical layered distribution, and then expanded into a nearby fully lamellar α2/γ layer and kept propagating through the entire α2/γ layer into another TiB2-rich layer, repeatedly, and finally the main crack propagated through all the fully lamellar α2/γ layers and TiB2-rich layers, eventually resulting in failure. Thus, the fracture mechanism of the innovative microlaminated TiB2-TiAl composites was proposed.

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Acknowledgments

The authors are grateful to the National Nature Science Foundation of China (Grant Nos. 51771064, 51971079, and 51401068).

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Author notes

  1. Xiping Cui and Yuanyuan Zhang have contributed equally to this work.

Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, P.R. China

    Xiping Cui, Yuanyuan Zhang, Yao Yao, Hao Ding, Lin Geng & Lujun Huang

  2. Department of Superalloys, IMR, CAS, Shenyang, 110016, P.R. China

    Yuan Sun

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  1. Xiping Cui
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  2. Yuanyuan Zhang
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  3. Yao Yao
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  4. Hao Ding
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  6. Lujun Huang
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  7. Yuan Sun
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Correspondence to Xiping Cui, Lujun Huang or Yuan Sun.

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Manuscript submitted May 13, 2019.

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Cui, X., Zhang, Y., Yao, Y. et al. Synthesis and Fracture Characteristics of TiB2-TiAl Composites with a Unique Microlaminated Architecture. Metall Mater Trans A 50, 5853–5865 (2019). https://doi.org/10.1007/s11661-019-05475-8

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  • DOI: https://doi.org/10.1007/s11661-019-05475-8

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