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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms >Effect of electron irradiation and heat treatment on the multi-step transformation in a Ni-rich near-equiatomic TiNi alloy
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Effect of electron irradiation and heat treatment on the multi-step transformation in a Ni-rich near-equiatomic TiNi alloy

机译：电子辐照和热处理对富Ni近等原子TiNi合金多步相变的影响

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In this work, Ti-50.6 at.% Ni shape memory alloy were solution annealed at 800℃ for 20 min and quenched in icy water, further annealing were done at 380 ℃ for 1 h, and then irradiated with 1.7 MeV electron at the fluence of 3.2x10~(20)-12.8x10~(20) m~(-2). The evolution of transformation temperatures was studied by differential scanning calorimeter (DSC). Effect of annealing on the evolution of multiple-step transformation temperatures also investigated. Heat treatment and irradiation had a prominent effect on the transformation, but with different characteristics. The M_1 (the first R-phase→martensite transformation) showed little change after irradiation, but the M_2 (the second R-phase→martensite transformation) transformation temperature decreased with increasing electron fluence and disappeared at the fluence of 12.8 x 10~(20) m~2. Heat treatment causes the shift of R-phase transformation start/finish temperature (R_s/R_f) to lower temperature and the shift of M_1 and M_2 transformation temperatures to higher temperature. The peaks of M_1 and M_2 almost merged into one peak with increasing annealing temperature. The effects of irradiation and annealing on the transformation characteristics are not exchangeable, so irradiation is also an important method for the study of condensed matter.
机译：在这项工作中，将Ti-50.6 at。％Ni形状记忆合金在800℃下固溶退火20分钟，然后在冰水中淬火，然后在380℃下进一步退火1 h，然后在通量处用1.7 MeV电子辐照。 3.2x10〜（20）-12.8x10〜（20）m〜（-2）用差示扫描量热仪（DSC）研究了转变温度的变化。还研究了退火对多步转变温度演变的影响。热处理和辐照对转变有显着影响，但具有不同的特性。辐照后，M_1（第一个R相→马氏体转变）的变化很小，但随着电子注量的增加，M_2（第二个R相→马氏体转变）的转变温度降低，在12.8 x 10〜（20 ）m〜2。热处理导致R相转变开始/结束温度（R_s / R_f）向较低温度转变，并且M_1和M_2转变温度向较高温度转变。随着退火温度的升高，M_1和M_2的峰几乎合并为一个峰。辐照和退火对相变特性的影响是不可交换的，因此辐照也是研究凝聚态物质的重要方法。

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