Temperature-Dependent Microstructure and Lattice Distortion in Pure Magnesium Investigated by Neutron and X-ray Diffraction
DOI:
https://doi.org/10.48048/tis.2026.11876Keywords:
Pure magnesium, Accumulative roll bonding, Microstructural evolution, Lattice distortion, Neutron diffraction, Residual stressAbstract
This study investigates the microstructural evolution and residual stress behavior of pure magnesium processed by Accumulative Roll Bonding (ARB) at 250 and 350 °C for up to 4 cycles. Characterization using Optical Microscopy, SEM, XRD, and Neutron Diffraction revealed significant grain refinement, with the smallest grain size of 6.591 μm in the Mg 3A sample (250 °C, 3 cycles). XRD indicated texture evolution with enhanced (002) orientation and increased lattice strain (0.21816%), while neutron diffraction confirmed compressive residual stress, reaching 138.275 MPa in Mg 3A. Lower processing temperature promoted finer grains and higher residual stress, whereas higher temperature facilitated recovery and stress relaxation. The combined use of XRD and neutron diffraction provided complementary insights into surface and bulk changes. Unlike conventional approaches that rely solely on XRD, this study uniquely integrates neutron diffraction to probe bulk stresses, marking a novel contribution in the characterization of ARB-processed pure magnesium. This approach represents a novel contribution in characterizing ARB-processed pure magnesium. ARB at 250 °C for 3 cycles was identified as the optimal condition to enhance microstructure and manage residual stress in pure magnesium.
HIGHLIGHTS
- Significant grain refinement achieved through Accumulative Roll Bonding processing at lower temperature, demonstrating effective microstructural refinement through severe plastic deformation
- Novel integration of neutron diffraction with X-ray diffraction provides complementary insights into both bulk and surface residual stress behavior, marking a significant advancement over conventional approaches
- Lower processing temperature promoted higher compressive residual stress and finer grain structure, while higher temperature facilitated recovery mechanisms and stress relaxation
- Enhanced texture evolution with basal plane orientation and increased lattice strain indicating substantial crystallographic changes that influence mechanical behavior
- Optimal processing conditions identified for simultaneously enhancing microstructure refinement and managing residual stress in pure magnesium for lightweight structural applications
GRAPHICAL ABSTRACT
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