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| Variation of microstructure and Ms of Ti44Ni47Nb9 alloy with heat treatment |
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| 东北大学 |
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Cite this article:
. Variation of microstructure and Ms of Ti44Ni47Nb9 alloy with heat treatment. Chin J Mater Res, 2004, 18(2): 199-204.
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Abstract Effect of heat treatment on $M_{\rm s}$ and microstructure of hot rolled Ti$_{44}$Ni$_{47}$Nb$_{9}$ rods has been studied in detail by means of X--Ray, SEM, TEM, DSC. Microstructure of Ti$_{44}$Ni$_{47}$Nb$_{9}$ alloy quenched from 750℃/30 min to 950℃/30 min mainly consists of TiNi matrix phase and $\beta$--Nb phase istributed at TiNi grain boundaries and sub--grain boundaries, and the amount of oxide (Ti, Nb)$_{4}$Ni$_{2}$O is very low, recovery and recrystallization were observed in matrix phase. The amount of $\beta$--Nb at TiNi grain boundaries and inside grains obviously increases, and the oxide amount also rises for the annealed
alloys; $\beta$--Nb mainly distributes at TiNi grain boundaries, the amount of oxide slightly increases for the alloys aged after solution treatment. Slow cooling or aging after solution treatment increases Ni/Ti ratio in matrix phase, decreases $M_{\rm s}$, and stabilizes martensite.
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Received: 21 May 2004
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