TY - JOUR
T1 - The investigation of α/β interface structure in Ti-5Al-6Nb(V/Cr) model titanium alloys
AU - Zhu, Wenguang
AU - Yang, Ruifeng
AU - Yang, Jiakun
AU - Xu, Xingge
AU - He, Ye
AU - Zhang, Jin Yu
AU - Fu, Anqing
AU - Zhang, Conghui
AU - Zhang, Hualei
AU - Zhang, Jinyu
N1 - Publisher Copyright:
© 2025 Elsevier Inc.
PY - 2025/7
Y1 - 2025/7
N2 - The structure of the α/β phase interface, which includes component such as interface misfit, dislocations, and step structures, critically influences the mechanical strength and stress distribution in titanium alloys. Pursuing an in-depth understanding of these characteristics, Ti-Al-Nb (V, Cr) ternary alloy system were ingeniously developed utilizing the Exact Muffin-Tin Orbitals (EMTO)-Coherent Potential Approximation (CPA) method to vary interface misfits. The study revealed that Ti-5(at.%)Al-6(at.%)Cr exhibited the highest misfit, followed by Ti-5Al-6 V and Ti-5Al-6Nb demonstrating the lowest. Misfits were experimentally characterized at various aging temperatures through selected area electron diffraction (SAED), aligning closely with theoretical predictions. High-resolution transmission electron microscopy (HRTEM) facilitated a detailed examination of Ti-5Al-6 V and Ti-5Al-6Nb, uncovering a shared broad interface step structure: the broad face of the α precipitate consists of areas of coherent terrace planes on 11¯00α‖112βand ledge planes on 01¯10α‖110β. Besides, the height of the ledges characterized is twice the 112βinterplanar spacing. Upon comparison with the initial phase transition, the equilibrium state α/β interface misfit was observed to increase, with a reduction in coherent regions. Notably, the Ti-5Al-6Nb alloy, with its lower misfit, presents broader terrace widths and reduced step density compared to Ti-5Al-6 V, suggesting an intrinsic link to the distinct transformation strains induced by V and Nb component.
AB - The structure of the α/β phase interface, which includes component such as interface misfit, dislocations, and step structures, critically influences the mechanical strength and stress distribution in titanium alloys. Pursuing an in-depth understanding of these characteristics, Ti-Al-Nb (V, Cr) ternary alloy system were ingeniously developed utilizing the Exact Muffin-Tin Orbitals (EMTO)-Coherent Potential Approximation (CPA) method to vary interface misfits. The study revealed that Ti-5(at.%)Al-6(at.%)Cr exhibited the highest misfit, followed by Ti-5Al-6 V and Ti-5Al-6Nb demonstrating the lowest. Misfits were experimentally characterized at various aging temperatures through selected area electron diffraction (SAED), aligning closely with theoretical predictions. High-resolution transmission electron microscopy (HRTEM) facilitated a detailed examination of Ti-5Al-6 V and Ti-5Al-6Nb, uncovering a shared broad interface step structure: the broad face of the α precipitate consists of areas of coherent terrace planes on 11¯00α‖112βand ledge planes on 01¯10α‖110β. Besides, the height of the ledges characterized is twice the 112βinterplanar spacing. Upon comparison with the initial phase transition, the equilibrium state α/β interface misfit was observed to increase, with a reduction in coherent regions. Notably, the Ti-5Al-6Nb alloy, with its lower misfit, presents broader terrace widths and reduced step density compared to Ti-5Al-6 V, suggesting an intrinsic link to the distinct transformation strains induced by V and Nb component.
KW - Interface structure
KW - Lattice misfit
KW - Microstructure
KW - Precipitate
KW - Titanium alloys
UR - https://www.scopus.com/pages/publications/105005399849
U2 - 10.1016/j.matchar.2025.115161
DO - 10.1016/j.matchar.2025.115161
M3 - 文章
AN - SCOPUS:105005399849
SN - 1044-5803
VL - 225
JO - Materials Characterization
JF - Materials Characterization
M1 - 115161
ER -