Residual stresses in novel metal/ceramic composites exhibiting a lamellar microstructure

2009 ◽  
Vol 24 (S1) ◽  
pp. S59-S64 ◽  
Author(s):  
Siddhartha Roy ◽  
Jens Gibmeier ◽  
Alexander Wanner
Keyword(s):  
Residual Stresses ◽  
Porous Ceramic ◽  
Lamellar Microstructure ◽  
Cost Effective ◽  
High Energy ◽  
Ceramic Composites ◽  
Aluminum Silicon Alloy ◽  
Spatially Resolved ◽  
Production Route ◽  
Metal Ceramic

The aim of this study is to analyze the mechanics of a new class of metal/ceramic composites on a mesoscopic length scale. These composites are produced by melt infiltration of porous ceramic preforms produced by freeze casting and subsequent sintering. This production route has a high application potential since it offers a cost-effective way to obtain composites with ceramic content in the 30 to 70 vol.%range. The as-produced material exhibits a hierarchical domain structure with each domain composed of alternating layers of metallic and ceramic lamellae. Residual stresses present in all phases of the composite produced by infiltrating alumina preforms with a eutectic aluminum-silicon alloy have been measured. Integral as well as spatially resolved measurements were carried out on single-domain samples at the high-energy, energy-dispersive diffraction (EDDI) beamline at the synchrotron radiation source BESSY (Berlin, Germany). Results show that strongly fluctuating residual stresses are introduced by the production process, which can be rationalized by taking into account the thermal expansion mismatch of alloy and preform.

Analysis of multiple cracking in metal/ceramic composites with lamellar microstructure

2015 ◽  
Vol 86 (1-2) ◽  
pp. 177-188 ◽  
Author(s):  
M. Kashtalyan ◽  
Y. Sinchuk ◽  
R. Piat ◽  
I. Guz
Keyword(s):  
Lamellar Microstructure ◽  
Ceramic Composites ◽  
Multiple Cracking ◽  
Metal Ceramic

scholarly journals Inelastic behavior of the single domain of metal-ceramic composites with lamellar microstructure

PAMM ◽  
2011 ◽  
Vol 11 (1) ◽  
pp. 285-286 ◽  
Author(s):  
Yuriy Sinchuk ◽  
Romana Piat ◽  
Siddhartha Roy ◽  
Jens Gibmeier ◽  
Alexander Wanner
Keyword(s):  
Lamellar Microstructure ◽  
Ceramic Composites ◽  
Single Domain ◽  
Inelastic Behavior ◽  
Metal Ceramic

Crack Growth in Metal-Ceramic Composites

2000 ◽  
Author(s):  
Parul Agrawal ◽  
C. T. Sun
Keyword(s):  
Residual Stresses ◽  
Crack Growth ◽  
Crack Path ◽  
Ceramic Composites ◽  
Fracture Mechanisms ◽  
Environmental Scanning ◽  
Metal Ceramic ◽  
Bend Tests ◽  
Point Bend

Abstract This research focuses on the fracture mechanisms in various metal-ceramic composites. The objective was to study the effects of volume fractions, residual stresses and other microstructural features like particle size and contiguity of the constituent phases, on fracture. Neutron diffraction tests were performed to measure residual stresses in these composites. In-situ 3-point bend tests were performed inside the ESEM (Environmental scanning electron microscope) chamber to observe crack growth. It was found that residual stresses and contiguity play dominant roles in fracture and defining the crack path. The correlations between residual stresses and other microstructural features with the crack path and failure mechanisms were established based on experimental observations.

scholarly journals Computational analysis of deformation and fracture in composite materials and coatings

2019 ◽  
Vol 221 ◽  
pp. 01017
Author(s):  
Ruslan Balokhonov ◽  
Rustam Bakeev ◽  
Varvara Romanova ◽  
Evgenia Emelianova ◽  
Maksim Sergeev ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Computational Analysis ◽  
Three Dimensional ◽  
Constitutive Models ◽  
Ceramic Composites ◽  
Isotropic Hardening ◽  
Ceramic Particles ◽  
Deformation And Fracture ◽  
Metal Ceramic ◽  
Composite Microstructure

Deformation and fracture of metal-ceramic composites and coatings under quasistatic tension, compression, shear, and during cooling from the melt to room temperatures are numerically investigated. Dynamic and quasistatic boundary-value problems are solved in twoand three-dimensional formulations by the finite-difference and finite-element methods. Constitutive models include the isotropic hardening of aluminum and fracture of ceramic particles. Composite microstructure is taken into account explicitly. Analysis of the fracture in composites is carried out, with the residual stresses being not taken into consideration. Origination of cracks in the near-interface regions of bulk tension and their propagation in ceramic particles are investigated. Residual stresses formed during cooling of the composites are calculated for different volume fractions of particles.

Material Parameter Identification of Interpenetrating Metal-Ceramic Composites

2009 ◽  
Vol 417-418 ◽  
pp. 53-56 ◽  
Author(s):  
Romana Piat ◽  
Siddharta Roy ◽  
Alexander Wanner
Keyword(s):  
Porous Ceramic ◽  
Micromechanical Model ◽  
Polarized Light ◽  
Ceramic Composites ◽  
Material Parameter Identification ◽  
Casting Technique ◽  
New Class ◽  
Ceramic Preform ◽  
Metal Ceramic ◽  
Manufacturing Parameters

A new class of metal/ceramic composites has recently been developed. A porous ceramic preform, the pore structure of which is created via a freeze-casting technique, is melt-infiltrated with metallic alloy via sqzeeze-casting. The microstructure of the composite has lamellar-like domains with geometrical characteristics which are dependent on the manufacturing parameters. The aim of our study is to find a good micromechanical model in order to deduce the mechanical properties of the single domains and of the whole material as a function of the microstructural geometry and the material parameters of the ceramics (alumina) and the alloy (Al-Si eutectic). Firstly, the statistical analysis of polarized light microscopic micrographs of the cross section of the specimen was performed. Domains with the same orientation of lamellae, so-called single domains were detected, selected and measured. The material modeling was performed by a two-step homogenisation procedure using a combination of different micromechanical models. Predicted material properties were compared with ultrasonic measurements for a single domain and for the whole microstructure.

Synthesis of Porous SiC Preform and Squeeze Infiltration Processing of Aluminium-SiC Metal Ceramic Composites

2012 ◽  
Vol 710 ◽  
pp. 371-376 ◽  
Author(s):  
K.M. Sree Manu ◽  
V.G. Resmi ◽  
M. Brahmakumar ◽  
N. Anand ◽  
T.P.D. Rajan ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Porous Ceramic ◽  
Ceramic Composites ◽  
Al Alloy ◽  
Pore Former ◽  
Squeeze Pressure ◽  
Sic Particles ◽  
Squeeze Infiltration ◽  
Ceramic Preform ◽  
Metal Ceramic

Metal-Ceramic Composites with high volume fraction of reinforcement find wide applications in the area of tribology and high temperature resistant components like piston, brake pads, heat shields etc. Most of these components can be made by infiltration processing of porous ceramic preforms. The present investigation is to synthesize porous ceramic preform based on SiC particles using inorganic salt as a pore forming agent and Squeeze infiltration is applied to fabricate the Al-SiC metal-ceramic composites. The direct squeeze infiltration of 6061 aluminum alloy on SiC preform is successfully carried out with the controlled process parameters of initial preform temperature, liquid metal superheat, squeeze pressure and its rate of application, and die temperature. The preform and composites are characterized using XRD, optical microscopy, electron microscopy, and hardness and compression strength. Porous ceramic preform with more than 50% porosity has been fabricated by sodium chloride as pore former. The infiltrated composite have shown uniform and complete infiltration of Aluminium alloy in between SiC particles and posses very high hardness of 147 BHN in as cast condition compared to 57 BHN for the 6061 Al alloy.

Sign in / Sign up

Export Citation Format

Share Document