采用弯曲试验和透射电镜分析研究了时效Ti49Ni51合金的显微组织与双程形状记忆效应．结果表明，500 ℃,1 h时效处理试样中Ti3Ni4相呈透镜片状，周围有较强的应变场衬度，而500 ℃,30 h时效试样中，Ti3Ni4相已聚集长大成粗片状，与基体失去共格．500 ℃,1 h时效处理试样在训练后可获得较好的双程形状记忆效应．时效Ti49Ni51合金中Ti3Ni4相粒子周围的共格应变场和训练时位错交互作用可以产生有效内应力场，从而诱发双程形状记忆效应．
参考文献
| [1] | BEYER J;BRAKEL R A;LOYD J R.Precipitation process in TiNi near-equiatemic alloy[A].Nara Japan,1986:703-708. |
| [2] | Gall K;SEHITOGLU H;CHYMLYAKOV Y I et al.The role of coherent precipitates in martensitic transformation in single crystal and polycrystalline Ti-50.8at.%Ni[J].Scripta Materialia,1998,39:699-705. |
| [3] | SABURIO T .Structure and mechanical behavior of Ti-Ni shape memory alloys[J].MRS Int'l Mtg on Adv Mats,1989,9:77-90. |
| [4] | Fukuda T;DEGUCHI A;KAKESHITA et al.Two-way shape memory properties of a Ni-Rich Ti-Ni alloy aged under tensile-stress Mater[J].Transactions of the JIM,1997,38:514-520. |
| [5] | Wu S K;LIN H C;Chou T S .Ti3Ni4 precipitate in aged Ni-rich TiNi alloy[J].Acta Materialia,1990,38:95-103. |
| [6] | 谢超英 .时效Ti-Ni形状记忆合金的相变与力学行为[D].哈尔滨工业大学,1990. |
| [7] | SCHERNGELL H;KNEISSL A C .Training and stability of the intrinsic two-way shape memory effect in NiTi alloys[J].Scripta Materialia,1998,39(02):205. |
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