京都大学 · 材料科学
Baoqi Guo教授の研究室では、金属材料の微細構造と相変態の動的挙動を、顕微鏡的・回折的・電気的測定を組み合わせたin-situ手法を用いて解明しています。特に、ジルコニウム合金やレーザー粉末床溶融法で製造されたチタン合金における相変態や不純物拡散のメカニズムに注目し、材料の力学的特性と微細構造の関係を定量的に解明しています。熱処理や加工過程における原子の移動や不純物の分配が、材料の強度や延性に与える影響を精密に制御・予測することを目指しています。
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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