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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 3/2015

01.03.2015

Micro-strain Evolution and Toughening Mechanisms in a Trimodal Al-Based Metal Matrix Composite

verfasst von: Yuzheng Zhang, Troy D. Topping, Hanry Yang, Enrique J. Lavernia, Julie M. Schoenung, Steven R. Nutt

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 3/2015

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Abstract

A trimodal metal matrix composite (MMC) based on AA (Al alloy) 5083 (Al-4.4Mg-0.7Mn-0.15Cr wt pct) was synthesized by cryomilling powders followed by compaction of blended powders and ceramic particles using two successive dual mode dynamic forgings. The microstructure consisted of 66.5 vol pct ultrafine grain (UFG) region, 30 vol pct coarse grain (CG) region and 3.5 vol pct reinforcing boron carbide particles. The microstructure imparted high-tensile yield strength (581 MPa) compared to a conventional AA 5083 (242 MPa) and enhanced ductility compared to 100 pct UFG Al MMC. The deformation behavior of the heterogeneous structure and the effects of CG regions on crack propagation were investigated using in situ scanning electron microscopy micro-tensile tests. The micro-strain evolution measured using digital image correlation showed early plastic strain localization in CG regions. Micro-voids due to the strain mismatch at CG/UFG interfaces were responsible for crack initiation. CG region toughening was realized by plasticity-induced crack closure and zone shielding of disconnected micro-cracks. However, these toughening mechanisms did not effectively suppress its brittle behavior. Further optimization of the CG distribution (spacing and morphology) is required to achieve toughness levels required for structural applications.
Vorheriger Artikel Microstructure and Mechanical Properties of Laves Phase-strengthened Fe-Cr-Zr Alloys
Nächster Artikel Application of MIVM for Sn-Zn System in Vacuum Distillation

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Metadaten
Titel
Micro-strain Evolution and Toughening Mechanisms in a Trimodal Al-Based Metal Matrix Composite
verfasst von
Yuzheng Zhang
Troy D. Topping
Hanry Yang
Enrique J. Lavernia
Julie M. Schoenung
Steven R. Nutt
Publikationsdatum
01.03.2015
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 3/2015
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-014-2729-8

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