Ti69Zr30Fe1高温形状记忆合金的微观结构和记忆特性

Microstructures and Memory Properties of Ti69Zr30Fe1 High-Temperature Shape Memory Alloy

摘要:

采用金相显微镜、X射线衍射（XRD）、透射电镜（TEM）、示差扫描量热分析（DSC）和力学压缩实验系统研究了Ti69Zr30Fe1高温形状记忆合金的微观结构、相变行为和力学性能。结果表明，Ti69Zr30Fe1合金室温下为单一的针状α￠￠马氏体相（正交结构）孪晶。在加热过程中，合金在580 ℃左右首先析出纳米尺度的ω相，然后在615 ℃到633 ℃之间发生从α￠￠马氏体相到β相的逆相变。冷却时在584 ℃到529 ℃之间发生马氏体相变。合金室温压缩临界应力为550 MPa，最大形状记忆效应达到2.1%

Abstract:

The microstructure, phase transformation and shape memory properties of Ti69Zr30Fe1 high-temperature shape memory alloy were investigated by optical microscopy (OM), X-ray diffraction (XRD), transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and compressive tests. The results show that Ti69Zr30Fe1 alloy is composed of single needle-like a￠￠ martensite with orthorhombic structure at room temperature. During heating process, nano scale ω phases precipitate within the grains at 584 oC, and then reverse martensitic transformation from α￠￠ phase to β phase occurs at 615~633 oC. When cooling, martensitic transformation occurs from 584 to 529 oC. The critical stress of Ti69Zr30Fe1 alloy is about 550 MPa and the maximum shape memory effect (SME) is 2.1%