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- Title
The equivalence of titanium alloys defined via β phase decomposition paths.
- Authors
Wang, Cenyang; Zhu, Zhihao; Song, Mengfan; Zhang, Shuang; Wang, Qing; Dong, Chuang
- Abstract
Conventionally, the structural stability of titanium alloys, featuring dual phases α and β, is assessed using empirical [Mo]eq and [Al]eq equivalences. We have attempted explaining the equivalent coefficients using the slopes of the β/α β phase boundaries in titanium-based binary phase diagrams. However, the β stability involves both temperature and composition extensions of the β phase zone; it is also related to kinetic factors, i.e., the β phase can be retained to room temperature only by quenching from above a certain critical temperature. In the present work, two β decomposition points are considered, from pure β to α at 882 °C and from β to a solute-rich phase apart from α, and the specific location of the latter is related to the critical temperature below which β easily decomposes into its low-temperature counterpart. Here, this critical temperature is fixed to 1030 °C for Ti–(Al, Sn, Si) alloys or to 800 °C for alloys containing β-phase stabilizers such as Ti–(Mo, Nb, V, Cr...). The β decomposition vector is defined, linking the former point to the latter one, which approximately extends along the β/(α β) phase boundary and reflects the β expansion behavior in both the temperature and the composition directions. The slope of this vector, supplemented by an α decomposition vector, points to a new form of equivalence, [Mo]eqC = 1Mo 0.7 V 0.6W 0.6Nb 0.2Ta 2.9Fe 1.7Cr 0.6Cu 1.6Ni 1.3Co 1.8Mn 0.6Si 0.01Zr—2.2Al—0.7Sn—15.1O – 38.6N – 75.4C, which generally agrees with the equivalent coefficients of Bania but unifies previously independent [Mo]eq and [Al]eq contributions. Under this new equivalence, the β phase is stable when [Mo]eqC exceeds 9. The feasibility of this β decomposition vector in the evaluation of the structural stability of titanium alloys is verified by analyzing 110 commonly used titanium alloys.
- Subjects
CRITICAL temperature; STRUCTURAL stability; PHASE diagrams; TIN; ALLOYS
- Publication
Journal of Materials Science, 2025, Vol 60, Issue 3, p1736
- ISSN
0022-2461
- Publication type
Academic Journal
- DOI
10.1007/s10853-024-10026-7