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Preparation of Ti2AlNb Alloy by Powder Metallurgy and Its Rupture Lifetime |
Jie WU,Lei XU( ),Bin LU,Yuyou CUI,Rui YANG |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Cite this article:
Jie WU,Lei XU,Bin LU,Yuyou CUI,Rui YANG. Preparation of Ti2AlNb Alloy by Powder Metallurgy and Its Rupture Lifetime. Chinese Journal of Materials Research, 2014, 28(5): 387-394.
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Abstract Pre-alloyed powder of Ti-22Al-24Nb-0.5Mo (atomic fraction, %) was prepared by crucibleless induction melting and gas atomization process. Then with the pre-alloyed powder, a powder metallurgical (PM) Ti2AlNb alloy was fabricated by a hot isostatic pressing route. The results show that the hot isostatic pressing temperature affects the metallurgical quality of PM Ti2AlNb alloys; the post heat treatment affects obviously the microstructure and the performance of the PM alloy; a good combination of tensile strength, ductility and rupture lifetime could be obtained through an optimized heat treatment process. It follows that the rupture lifetime of PM Ti2AlNb alloys was controlled by the interaction of multiple factors such as the sizes and volume fractions of α2, O and B2 phases after various heat treatments. With the increase of aging temperature (800~850℃), the size of secondary O phase increased and α2 volume fraction decreased, thereby the rupture lifetime was increased. With the increase of aging temperature (850-900℃), the size of secondary O phase and α2 volume fraction remain nearly constant. It was the increase of B2 volume fraction and α2 size that improve the rupture lifetime of PM Ti2AlNb alloys.
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Received: 31 December 2013
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Fund: *Supported by National High Technology Research and Development Program of China No.2013AA031606. |
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