Microstructural control of Ti-Al-Mo-Nb alloy system with respect to variation of B |
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| Authors: | Minseok Kim Kwangsoo Choi Jun Zhu Fan Zhang Youngbuem Song Youngwon Kim Seonghoon Yi Joon Sik Park |
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| Affiliation: | 1.Department of Materials Science and Engineering,Hanbat National University,Daejeon,Republic of Korea;2.CompuTerm LCC,Middleton,USA;3.Agency for Defense Development,Daejeon,Republic of Korea;4.Gamteck LLC,Beavercreek,USA;5.Department of Materials Science and Metallurgical Engineering,Kyungpook National University,Daegu,Republic of Korea |
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| Abstract: | In the current study, phase stability of Ti-Al-Mo-Nb alloys was investigated, and the effect of B addition was examined for cast alloys. The fabricated cast alloys were mainly composed of α2 / γ lamellar with a β phase, when they were heat treated at 1100 °C followed by air cooling, the alloy was composed of α2 / γ lamellar with γ+β necklace phase at the colony boundary for the Ti-45Al-3Mo-2Nb-1B alloy, and the colony size was refined to ~ 20 μm. In order to identify the effect of the microstructures on mechanical strength, compressive tests were performed on the fabricated alloys of Ti-45Al-3Mo-2Nb and Ti-45Al-3Mo-2Nb-1B at room temperature and at 800 °C. The microstructural variations and phase stability were discussed in terms of pseudo-binary phase diagram calculated by Pandat software?. |
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