TY  - JOUR
A1  - Evsevleev, Sergei
A1  - Mishurova, Tatiana
A1  - Cabeza, Sandra
A1  - Koos, R.
A1  - Sevostianov, Igor
A1  - Garcés, Gonzales
A1  - Requena, Guillermo
A1  - Fernandez, R.
A1  - Bruno, Giovanni
T1  - The role of intermetallics in stress partitioning and damage evolution of AlSil2CuMgNi alloy
JF  - Materials Science and Engineering: A-Structural materials: properties, microstructure and processing
N2  - Load partitioning between phases in a cast AlSi12CuMgNi alloy was investigated by in-situ compression test during neutron diffraction experiments. Computed tomography (CT) was used to determine volume fractions of eutectic Si and intermetallic (IM) phases, and to assess internal damage after ex-situ compression tests. The CT reconstructed volumes showed the interconnectivity of IM phases, which build a 3D network together with eutectic Si. Large stresses were found in IMs, revealing their significant role as a reinforcement for the alloy. An existing micromechanical model based on Maxwell scheme was extended to the present case, assuming the alloy as a three-phase composite (Al matrix, eutectic Si, IM phases). The model agrees well with the experimental data. Moreover, it allows predicting the principal stresses in each phase, while experiments can only determine stress differences between the axial and radial sample directions. Finally, we showed that the addition of alloying elements not only allowed developing a 3D interconnected network, but also improved the strength of the Al matrix, and the ability of the alloy constituents to bear mechanical load.
KW  - Aluminum alloys
KW  - Neutron diffraction
KW  - Micromechanical modeling
KW  - Internal stress
KW  - Damage
KW  - Computed tomography
Y1  - 2018
U6  - https://doi.org/10.1016/j.msea.2018.08.070
SN  - 0921-5093
SN  - 1873-4936
VL  - 736
SP  - 453
EP  - 464
PB  - Elsevier
CY  - Lausanne
ER  - 
TY  - JOUR
A1  - Cabeza, Sandra
A1  - Mishurova, Tatiana
A1  - Garcés, Gonzales
A1  - Sevostianov, Igor
A1  - Requena, Guillermo
A1  - Bruno, Giovanni
T1  - Stress-induced damage evolution in cast AlSi12CuMgNi alloy with one- and two-ceramic reinforcements
JF  - Journal of materials science
N2  - Two composites, consisting of an as-cast AlSi12CuMgNi alloy reinforced with 15 vol% Al2O3 short fibres and with 7 vol% Al2O3 short fibres + 15 vol% SiC particles, were studied. Synchrotron computed tomography disclosed distribution, orientation, and volume fraction of the different phases. In-situ compression tests during neutron diffraction in direction parallel to the fibres plane revealed the load partition between phases. Internal damage (fragmentation) of the Si phase and Al2O3 fibres was directly observed in CT reconstructions. Significant debonding between Al matrix and SiC particles was also found. Finally, based on the Maxwell scheme, a micromechanical model was utilized for the new composite with two-ceramic reinforcements; it rationalizes the experimental data and predicts the evolution of all internal stress components in each phase.
Y1  - 2017
U6  - https://doi.org/10.1007/s10853-017-1182-7
SN  - 0022-2461
SN  - 1573-4803
VL  - 52
SP  - 10198
EP  - 10216
PB  - Springer
CY  - New York
ER  -