인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Titanium diboride (TiB<sub>2</sub>) and molybdenum diboride (MoB<sub>2</sub>) are known for their excellent mechanical properties such as high hardness, wear resistance and thermal stability, of great interest in advanced engineering applications. This study systematically explored the structural, electronic, thermal, and mechanical properties of Ti-Mo-B<sub>2</sub> solid solutions via first-principles density functional theory (DFT). Mo is substituted into the TiB<sub>2</sub> lattice to investigate its effect on five alloy compositions of key material properties. Our analysis revealed that increasing Mo content enhances ductility while reducing stiffness and hardness, transitioning from a more rigid, covalent structure in TiB<sub>2</sub> to a more ductile, metallic behavior in MoB<sub>2</sub>, as shown by the rise in Poisson's ratio from 0.13 in TiB<sub>2</sub> to 0.26 in MoB<sub>2</sub> and the Pugh's ratio increase from 1.00 to 1.70. Mo substitution reduces Debye temperature as well as melting points. Phonon dispersion calculations show that the Ti<sub>0.5</sub>Mo<sub>0.5</sub>B<sub>2</sub> solid solution exhibits dynamical stability, making it a promising composition for enhanced mechanical and thermal stability. Our studies also demonstrate that the alloys form stable solid solutions across all compositions, with stability reflected by negative mixing energies. These findings provide a key information into designing high-performance Ti-Mo-B<sub>2</sub> composites with specific mechanical and thermal characteristics.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.