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Neutron Diffraction Study and Deformation Behavior of a Composite Based Mg Alloy Reinforced by Short Saffil Fibers

100%

Farkas G., Máthis K., Pilch J.

In the present work neutron diffraction has been applied for ex situ investigation of residual stresses in Mg-4%Al-1%Ca (AX41) magnesium alloy reinforced with short Saffil fibers. Samples were deformed in compression at room temperature. Two types of fiber arrangement were investigated. In both samples the fibers were homogeneously distributed and arranged in parallel planes with a random fiber orientation. In the first sample these planes were parallel with the loading axis and in the second one they were perpendicular to the loading direction. Significant dependence of both the mechanical properties and residual strains on the fibers orientation was observed. Sample with parallel fiber arrangement showed higher hardness and lower ductility. Further the increment of residual tensile lattice strain in the matrix with a macroscopic deformation is much higher than in the other case. It was found that the residual strain evolution strongly depends on the orientation of grains in the matrix.

In Situ Neutron Diffraction Characterization of Phases in Co-Re-Based Alloys at High Temperatures

64%

Strunz P., Mukherji D., Gilles R., Gasser U., Beran P., Farkas G., Hofmann M., Karge L., Rösler J.

Acta Physica Polonica A

2015

vol. 128

issue 4

684-688

Co-Re-based alloys strengthened by carbides are promising candidates for new high-temperature alloys for gas turbine applications. The high temperature microstructure and its stability are of utmost importance, e.g. due to strengthening-phase selection. Neutron scattering, providing in situ information at high temperatures, was extensively used in the past for the Co-Re alloys research. The paper focuses on TaC strengthened alloy, particularly on the stability TaC precipitates which were previously shown not to dissolve up to at least 1300°C. Small-angle neutron scattering shows that its finer morphological variant - most suitable for high temperature strengthening - coarsened even at relatively low temperature of 1000°C. This coarsening is faster at higher temperatures and the mean size exceeded 1000 Å (i.e. the size - detection limit of the used facility) after 4 h hold at 1200°C.

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2 Acta Physica Polonica A

2 2015

2 Farkas G.

1 Beran P.

1 Gasser U.

1 Gilles R.

1 Hofmann M.

1 Karge L.

1 Mukherji D.

1 Máthis K.

1 Pilch J.

1 Rösler J.

1 Strunz P.

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Neutron Diffraction Study and Deformation Behavior of a Composite Based Mg Alloy Reinforced by Short Saffil Fibers

In Situ Neutron Diffraction Characterization of Phases in Co-Re-Based Alloys at High Temperatures