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

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.

RAS ID

36890

Document Type

Journal Article

Date of Publication

2021

Volume

225

Funding Information

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

School

School of Engineering

Copyright

subscription content

Publisher

Elsevier

Identifier

L. C. Zhang

ORCID : 0000-0003-0661-2051

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

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Link to publisher version (DOI)

10.1016/j.compositesb.2021.109265