京都大学 · Materials Science
Ruixiao Zheng 교수의 연구실은 나노구조 금속 및 마그네슘 합금의 거시적 거동을 제어하기 위해 미세구조 설계에 초점을 맞추고 있습니다. 특히, 입자 재료 공정을 활용한 3차원 코어-쉘 나노구조 형성과 고도로 제어된 다공성 미세구조를 통해 강도와 연성의 상충 관계를 극복하는 데 성공했습니다. 연구는 나노크리스탈린 마그네슘, 구리 및 알루미늄 합금을 대상으로 하며, 고해상도 미세구조 분석과 원자 스케일 시뮬레이션을 융합하여 기계적 거동의 기초 메커니즘을 규명하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Magnesium (Mg) and its alloys usually show relatively low strength and poor ductility at room temperature due to their anisotropic hexagonal close-packed (HCP) crystal structure that provides a limited number of independent slip systems. Here we report that unique combinations of strength and ductility can be realized in bulk polycrystalline pure Mg by tuning the predominant deformation mode. We succeeded in obtaining the fully recrystallized specimens of pure Mg having a wide range of average g
Heterogeneous microstructural design has been proven to be an effective strategy in breaking the strength–ductility dilemma in nanostructured metals. However, the precise control of heterogeneous microstructures to achieve strength–ductility synergy remains challenging. Here, we demonstrate a novel powder metallurgy approach for creating three-dimensional (3D) core–shell nanostructures with highly tunable shell thickness and grain size distributions. These 3D nanostructures enable superior stren
Recently, we have found that fully recrystallized ultrafine-grained (UFG) microstructures could be realized in a commercial precipitation-hardened Magnesium (Mg) alloy. The UFG specimens exhibited high strength and large ductility under tensile test, but underlying mechanisms for good mechanical properties remained unclear. In this study, we have carried out systematic observations of deformation microstructures for revealing the influence of grain size on the change of dominant deformation mode
