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  - Fernandez, R.
A1  - Cabeza, Sandra
A1  - Mishurova, Tatiana
A1  - Fernandez-Castrillo, P.
A1  - Gonzalez-Doncel, Gaspar
A1  - Bruno, Giovanni
T1  - Residual stress and yield strength evolution with annealing treatments in an age-hardenable aluminum alloy matrix composite
JF  - Materials Science and Engineering: A
N2  - We investigated the possibility of minimizing tensile matrix residual stresses in age hardenable aluminum alloy metal matrix composites without detrimentally affect their mechanical properties (such as yield strength). Specifically, we performed thermal treatments at different temperatures and times in an age-hardenable aluminum matrix composite 2014Al-15vol%Al2O3. Using X-ray synchrotron radiation diffraction and mechanical tests, we show that below a certain treatment temperature (250 degrees C) it is possible to identify an appropriate thermal treatment capable of relaxing residual stress in this composite while even increasing its yield strength, with respect to the as processed conditions.
KW  - Residual stress
KW  - Yield strength
KW  - Annealing treatment
KW  - Metal matrix composite
KW  - Diffraction
Y1  - 2018
U6  - https://doi.org/10.1016/j.msea.2018.06.031
SN  - 0921-5093
SN  - 1873-4936
VL  - 731
SP  - 344
EP  - 350
PB  - Elsevier
CY  - Lausanne
ER  -