skip to main content

SciTech ConnectSciTech Connect

Title: The correlation of local deformation and stress-assisted local phase transformations in MMC foams

Cellular structures are of growing interest for industry, and are of particular importance for lightweight applications. In this paper, a special case of metal matrix composite foams (MMCs) is investigated. The investigated foams are composed of austenitic steel exhibiting transformation induced plasticity (TRIP) and magnesia partially stabilized zirconia (Mg-PSZ). Both components exhibit martensitic phase transformation during deformation, thus generating the potential for improved mechanical properties such as strength, ductility, and energy absorption capability. The aim of these investigations was to show that stress-assisted phase transformations within the ceramic reinforcement correspond to strong local deformation, and to determine whether they can trigger martensitic phase transformations in the steel matrix. To this end, in situ interrupted compression experiments were performed in an X-ray computed tomography device (XCT). By using a recently developed registration algorithm, local deformation could be calculated and regions of interest could be defined. Corresponding cross sections were prepared and used to analyze the local phase composition by electron backscatter diffraction (EBSD). The results show a strong correlation between local deformation and phase transformation. - Graphical abstract: Display Omitted - Highlights: • In situ compressive deformation on MMC foams was performed in an XCT. • Local deformation fields and theirmore » gradient amplitudes were estimated. • Cross sections were manufactured containing defined regions of interest. • Local EBSD phase analysis was performed. • Local deformation and local phase transformation are correlated.« less
Authors:
 [1] ; ;  [1] ; ;  [2]
  1. TU Bergakademie Freiberg, Agricolastraße 17, D-09599 Freiberg (Germany)
  2. Fraunhofer ITWM, Fraunhoferplatz 1, D-67663 Kaiserslautern (Germany)
Publication Date:
OSTI Identifier:
22476161
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 107; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMPLITUDES; AUSTENITIC STEELS; BACKSCATTERING; CERAMICS; COMPRESSION; COMPUTERIZED TOMOGRAPHY; CORRELATIONS; CROSS SECTIONS; DEFORMATION; DUCTILITY; ELECTRON DIFFRACTION; MAGNESIUM OXIDES; MARTENSITIC STEELS; METALS; PHASE STUDIES; PHASE TRANSFORMATIONS; STRESSES; ZIRCONIUM OXIDES