High-strength bulk al-based bimodal ultrafine eutectic composite with enhanced plasticity

Jin Man Park, Norbert Mattern, Uta Kühn, Jürgen Eckert, Ki Buem Kim, Won Tae Kim, Kamanio Chattopadhyay, Do Hyang Kim

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)

Abstract

An in situ bulk ultrafine bimodal eutectic Al-Cu-Si composite was synthesized by solidification. This heterostructured composite with microstructural length scale hierarchy in the eutectic microstructure, which combines an ultrafine-scale binary cellular eutectic (α-Al + Al 2Cu) and a nanometer-sized anomalous ternary eutectic (α-Al + Al2Cu + Si), exhibits high fracture strength (1.1 ±0.1 GPa) and large compressive plastic strain (11 ± 2%) at room temperature. The improved compressive plasticity of the bimodal-nanoeutectic composite originates from homogeneous and uniform distribution of inhomogeneous plastic deformation (localized shear bands), together with strong interaction between shear bands in the spatially heterogeneous structure.

Original languageEnglish
Pages (from-to)2605-2609
Number of pages5
JournalJournal of Materials Research
Volume24
Issue number8
DOIs
Publication statusPublished - 2009 Aug

Bibliographical note

Funding Information:
The authors thank Dr. J. Jayaraj (IFW-Dresden) for valuable discussions. This work was supported by the Global Research Laboratory Program of the Korea Ministry of Education, Science, and Technology. Additional funding was supported under the AFOSR Task: Basic Research for AOARD 084013 (Dr. Kumar V. Jata, Program Manager).

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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