Collapse of lamellar structure and stability with the addition of Misch metal (Mm) to the cast Ti–Al–Mo–Nb–(Mm) alloys
| Autor: | Kwangsu Choi, Seonghoon Yi, Youngbuem Song, Min-Seok Kim, Joon Sik Park, Fan Zhang, Jun Zhu |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Alloy 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Isothermal process Lamella (surface anatomy) Mechanics of Materials Phase (matter) 0103 physical sciences Ultimate tensile strength engineering General Materials Science Lamellar structure Composite material 0210 nano-technology Misch metal Phase diagram |
| Zdroj: | Journal of Materials Science. 53:12504-12511 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-018-2439-5 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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