Unprecedented enhancement in strength-plasticity synergy of (TiC+Al6MoTi+Mo)/Al cermet by multiple length-scale microstructure stimulated synergistic deformation

Author Identifier

L. C. Zhang

ORCID : 0000-0003-0661-2051

Document Type

Journal Article

Publication Title

Composites Part B: Engineering

Volume

225

Publisher

Elsevier

School

School of Engineering

RAS ID

36890

Funders

National Natural Science Foundation of China Postdoctoral Science Foundation of China Science & Technology Research Foundation of Education Bureau of Jilin Province, China

Comments

Yang, H. Y., Yan, Y. F., Liu, T. S., Dong, B. X., Chen, L. Y., Shu, S. L., . . . Zhang, L. C. (2021). Unprecedented enhancement in strength-plasticity synergy of (TiC+ Al6MoTi+ Mo)/Al cermet by multiple length-scale microstructure stimulated synergistic deformation. Composites Part B: Engineering, 225, article 109265. https://doi.org/10.1016/j.compositesb.2021.109265

Abstract

Metal-ceramic composites generally exhibit limited strength-plasticity synergy due to pronounced difference in elastic and plastic deformation between “soft phase” and “hard phase”, bottlenecking their applications. This work proposes a novel microstructure design concept using refractory metals and intermetallics to offer compromises between “soft phase” and “hard phase”. A cost-effective fabrication method was used to produce 70 vol% (TiC + Al6MoTi + Mo)/Al cermet. The cermet is composed of submicron-TiC, micron-Al6MoTi and nano-Mo particles separated by Al in homogeneous microstructure. This multiple length-scale microstructure could delocalize stress concentration, enhance work hardening and deformation compatibility in cermet, resulting in unprecedentedly enhanced strength-plasticity synergy. Ultimate compressive strength, plastic strain and product of strength and plasticity of (TiC + Al6MoTi + Mo)/Al at room temperature and 573 K respectively are 1227 MPa, 6.9%, 7445 MPa·% and 781 MPa, 15.0%, 10021 MPa·%, which are increased by ~30%, ~25%, ~60% and ~37%, ~9%, 41% respectively compared with those for traditional 70 vol% TiC/Al. This work opens new perspectives for the design and application of metal-ceramic composites with high strength and plasticity synergy.

DOI

10.1016/j.compositesb.2021.109265

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