Kyoto University · Materials Science
Professor Baoqi Guo's research lab specializes in the microstructural evolution and phase transformation behavior of advanced metallic materials, particularly zirconium and titanium alloys, under thermomechanical and post-processing conditions. The lab focuses on in-situ characterization techniques such as neutron diffraction and X-ray line profile analysis to investigate dynamic phase transformations, dislocation dynamics, and lattice parameter changes during deformation and heat treatment. Their work bridges fundamental understanding of phase stability with practical applications in improving mechanical properties like ductility and strength in additively manufactured and processed alloys. The lab also explores the role of solute elements (e.g., Sn) and residual stresses in influencing microstructure evolution and material performance.
Figures are computed from collected data and may differ slightly.
Dynamic transformation from alpha (HCP) to beta (BCC) phase in a zirconium alloy was revealed by the use of in-situ neutron diffraction during hot compression. The dynamic transformation was unexpectedly detected during isothermal compression at temperatures of 900°C and 950°C (alpha + beta two-phase region) and strain rates of 0.01 s−1 and 0.001 s−1, even though equilibrium two-phase states were achieved prior to the hot compression. Dynamic transformation was accompanied by diffusion of Sn fro
Post annealing treatment is generally needed for additively manufactured titanium alloy to decompose metastable phases, alleviate residual stress, and improve ductility. In this work, in-situ electrical resistivity and line profile analysis of X-ray diffraction were utilized for monitoring phase transformation behaviors and dislocation evolutions of a laser powder bed fusion-built Ti-6Al-4V alloy under post annealing treatment. Besides, hardness and tensile tests were adopted for revealing the e
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