TY  - JOUR
A1  - Mishurova, Tatiana
A1  - Cabeza, Sandra
A1  - Artzt, Katia
A1  - Haubrich, Jan
A1  - Klaus, Manuela
A1  - Genzel, Christoph
A1  - Requena, Guillermo
A1  - Bruno, Giovanni
T1  - An Assessment of Subsurface Residual Stress Analysis in SLM Ti-6Al-4V
JF  - Materials
N2  - Ti-6Al-4V bridges were additively fabricated by selective laser melting (SLM) under different scanning speed conditions, to compare the effect of process energy density on the residual stress state. Subsurface lattice strain characterization was conducted by means of synchrotron diffraction in energy dispersive mode. High tensile strain gradients were found at the frontal surface for samples in an as-built condition. The geometry of the samples promotes increasing strains towards the pillar of the bridges. We observed that the higher the laser energy density during fabrication, the lower the lattice strains. A relief of lattice strains takes place after heat treatment.
KW  - selective laser melting
KW  - additive manufacturing
KW  - heat treatment
KW  - Ti-6Al-4V
KW  - synchrotron X-ray diffraction
KW  - residual stress
Y1  - 2017
U6  - https://doi.org/10.3390/ma10040348
SN  - 1996-1944
VL  - 10
PB  - MDPI
CY  - Basel
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  -