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Bio-mimic Ti-Ta composite with hierarchical “brick-and-mortar” microstructure

DOI: 10.1016/j.mtla.2019.100463 DOI Help

Authors: Shenghang Xu (Central South University) , Meng Du (Central South University; City University of Hong Kong) , Jia Li (Hunan University) , Kun Yan (University of Manchester) , Biao Cai (University of Birmingham) , Quanfeng He (City University of Hong Kong) , Qihong Fang (Hunan University) , Oxana Magdysyuk (Diamond Light Source) , Bin Liu (Central South University) , Yong Yang (City University of Hong Kong) , Yong Liu (Central South University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Materialia

State: Published (Approved)
Published: September 2019
Diamond Proposal Number(s): 18192

Abstract: Nature materials, such as bones and nacre, achieve excellent balance of toughness and strength via a hierarchical “brick-and-mortar” microstructure, which is an attractive model for engineering materials design. Here, we produced nacre-like Ti-Ta metallic composites via a powder metallurgy process, during which mixed powders were sintered by spark plasma sintering, followed by hot and cold rolling and then annealing. The structure consists of soft Ta-enriched regions and hard Ti-enriched regions in a hierarchical and laminated fashion. The microstructural heterogeneity spans several scales due to the diffusion between Ti and Ta. This yields a novel metal-metal composite with a balanced combination of strength and ductility (1226 MPa ultimate tensile strength and 20.8% elongation), outperforming most of conventional Ti based alloys and composites. Via the complementary in situ synchrotron X-ray diffraction and electron microscopies, it is found out that multiple micromechanisms are active, including nano-particle and dislocation localized strengthening as well as phase transformation induced plasticity. The manufacturing route developed here is versatile, capable of making high performance bio-mimic metallic composites.

Journal Keywords: Bio-mimic materials; Metal-metal composites; Ti-Ta; Microstructure

Subject Areas: Biology and Bio-materials

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing