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- Title
Collapse of lamellar structure and stability with the addition of Misch metal (Mm) to the cast Ti-Al-Mo-Nb-(Mm) alloys.
- Authors
Choi, Kwangsu; Kim, Minseok; Zhu, Jun; Zhang, Fan; Song, Youngbuem; Yi, Seonghoon; Park, Joon Sik
- Abstract
Misch metal (Mm), consisting of Ce and La, was added to Ti-45Al-3Mo-2Nb alloys in order to investigate phase transformation and microstructural changes. The pseudo-binary phase diagram was estimated via PANDAT software™. The addition of Mm caused a decrease in both the fractions of α2/γ lamella and the β0 phase, and served as an important factor for a collapse of lamellar structures. In addition, Mm significantly decreased the colony size of the alloy, resulting in an increase in high-temperature tensile yield strength of ~ 40% for the alloys with 0.3 at% Mm at 800 °C. It appears that the addition of Mm affects the phase stability and increase the proportion of the γ phase. The microstructural changes, with respect to Mm additions, were discussed in terms of structural observations during isothermal heat treatments.
- Subjects
MISCHMETAL; PHASE transitions; PHASE diagrams; TENSILE strength; HEAT treatment
- Publication
Journal of Materials Science, 2018, Vol 53, Issue 17, p12504
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-018-2439-5