Simultaneously enhancing room-temperature strength-ductility synergy and high-temperature performance of titanium matrix composites via building a unique bimodal architecture with multi-scale reinforcements

IF 9.4 1区 材料科学 Q1 ENGINEERING, MECHANICAL
Yuanyuan Zhang , Xiping Cui , Lingfei Chen , Naonao Gao , Xuanchang Zhang , Zhiqi Wang , Guanghui Cong , Xiangxin Zhai , Jiawei Luo , Yifan Zhang , Junfeng Chen , Lin Geng , Lujun Huang
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引用次数: 0

Abstract

To meeting the double demands of structural weight reduction and performance improvement of aerospace vehicle, conventional high-temperature titanium alloys or titanium matrix composites (TMCs) are encountering a huge challenge that the room-temperature ductility will be inevitably deteriorated in pursuit of enhancing the elevated high-temperature strength. The present work proposes a feasible strategy for resolving this contradiction by constructing a novel bimodal architecture and introducing the multiscale reinforcements of microsized TiB whiskers and micro/nanosized Y2O3 particles. The unique bimodal microstructure consists of primary microsized αp/β lath clusters and micro/nano basketweave-like structure composing of αp, secondary nanosized αs and β laths. It is noteworthy that the bimodal (TiB+Y2O3)/Ti composite exhibits excellent mechanical properties with the ultimate tensile strength (UTS) of 1318 MPa with the total elongation to failure (EL) of 10.5 % at room temperature, and UTS of 934 MPa with EL of 23 % at 600 °C, far higher that of the reported 600 °C high temperature titanium alloys or TMCs. In-situ investigations indicate the postponed strain localization, the activated extra 〈c + a〉 dislocations within αp laths, and the heterogeneous deformation induced (HDI) hardening caused by the unique bimodal microstructure, synergistically promoted the ductility of bimodal (TiB+Y2O3)/Ti composite. While the strength enhancement at room temperature and 600 °C is attributed to the synergistic strengthening effect of nanosized αs, microsized TiB whiskers and micro/nanosized Y2O3 particles and HDI strengthening. These findings provide a new insight for improving mechanical properties of metal matrix composites.

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来源期刊
International Journal of Plasticity
International Journal of Plasticity 工程技术-材料科学:综合
CiteScore
15.30
自引率
26.50%
发文量
256
审稿时长
46 days
期刊介绍: International Journal of Plasticity aims to present original research encompassing all facets of plastic deformation, damage, and fracture behavior in both isotropic and anisotropic solids. This includes exploring the thermodynamics of plasticity and fracture, continuum theory, and macroscopic as well as microscopic phenomena. Topics of interest span the plastic behavior of single crystals and polycrystalline metals, ceramics, rocks, soils, composites, nanocrystalline and microelectronics materials, shape memory alloys, ferroelectric ceramics, thin films, and polymers. Additionally, the journal covers plasticity aspects of failure and fracture mechanics. Contributions involving significant experimental, numerical, or theoretical advancements that enhance the understanding of the plastic behavior of solids are particularly valued. Papers addressing the modeling of finite nonlinear elastic deformation, bearing similarities to the modeling of plastic deformation, are also welcomed.
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