Synchrotron X-ray diffraction measurements of internal stresses during loading of steel-based metal matrix composites reinforced with TiB2 particles

High-energy synchrotron X-ray diffraction was used to measure the internal strain evolution in the matrix and reinforcement of steel-based metal matrix composites reinforced with particulate titanium diboride (TiB2). Two systems were studied: a 316L matrix with 25% TiB2 by volume and a W1.4418 matrix with 10% reinforcement. In situ loading experiments were performed, where the materials were loaded uniaxially in the X-ray beam. The results show the strain partitioning between the phases in the elastic regime, and the evolution of the strain partitioning once plasticity occurs. The results are compared with results from Eshelby modelling, and very good agreement is seen between the measured and modelled response for elastic loading of the material. Heat treatment of the 316-based material did not affect the elastic internal strain response.

► Synchrotron X-ray diffraction was used to measure internal stresses in Fe–TiB2 MMCs.
► Samples of the MMCs were loaded to failure in situ in the X-ray beam.
► The results show good elastic load transfer from the matrix to the reinforcement.
► There is good agreement with the predicted elastic stresses from Eshelby modeling.
► During plastic deformation there is increasing load transfer to the reinforcement.