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Transformation twinning and deformation twinning of NiTi shape memory alloy

机译：NiTi形状记忆合金的相变孪晶和形变孪晶

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摘要

Transformation twinning and deformation twinning of NiTi shape memory alloy are investigated on the basis of a nominal chemical composition of Ni_(50)Ti_(50) and Ni_(50.9)Ti_(49.1) (atomic percent), respectively. In the case of Ni_(50)Ti_(50) alloy, {111} type Ⅰ twin and <011 > type Ⅱ twin can be observed in the NiTi matrix, but it seems that {111} type Ⅰ twin is dominant. In the case of as-rolled Ni_(50)Ti_(50) alloy subjected to heating for 2 h at 850 ℃ and subsequent quenching into liquid nitrogen, in particular, the primary twin and the secondary twin can be observed. The occurrence of the secondary twin plays a critical role in guaranteeing the compatibility of martensitic transformation. In the Ni_(50.9)Ti_(49.1) samples aged at 600 ℃, the occurrence of martensitic twins is attributed to the local inhomogeneous composition in the micro-structures and the dislocation networks at the interface between the incoherent Ni_4Ti_3 precipitates and the B2 matrix. The (001) martensitic compound twins appear in the Ni_(50.9)Ti_(49.1) sample subjected to local canning compression at room temperature and subsequent annealing at 600 ℃. The phenomenon is attributed to the fact that the lattice distortion along with the dislocation defects frequently occurs in the coarse-grained NiTi sample derived from crystallization of the amorphous phase and thus contributes to the occurrence of the (001) martensitic compound twins. A high density of dislocations is distributed in the B2 austenite matrix and {114} B2 austenitic compound twin can be observed in the Ni_(50.9)Ti_(49.1) sample subjected to local canning compression at 300 ℃, which indicates that dislocation slip and deformation twinning play an important role in local canning compression of Ni_(5.9)Ti_(49.1) alloy at 300 ℃.
机译：基于Ni_（50）Ti_（50）和Ni_（50.9）Ti_（49.1）（原子百分比）的标称化学成分，研究了NiTi形状记忆合金的相变孪生和形变孪生。在Ni_（50）Ti_（50）合金的情况下，在NiTi基体中可以观察到{111}Ⅰ型孪晶和<011>Ⅱ型孪晶，但似乎{111}Ⅰ型孪晶占主导。轧制后的Ni_（50）Ti_（50）合金在850℃下加热2 h，然后淬火成液氮，尤其是可以观察到一次孪晶和二次孪晶。次生孪晶的出现在保证马氏体相变的相容性中起着至关重要的作用。在600℃时效的Ni_（50.9）Ti_（49.1）样品中，马氏体孪晶的出现归因于微观结构中局部的不均匀成分以及不相干的Ni_4Ti_3析出物与B2基体之间界面的位错网络。 Ni_（50.9）Ti_（49.1）样品在室温下进行局部罐头压缩，随后在600℃退火，出现（001）马氏体化合物孪晶。该现象归因于以下事实：由于非晶相的结晶而在粗晶NiTi样品中经常发生晶格畸变和位错缺陷，因此有助于（001）马氏体化合物孪晶的出现。高位错密度分布在B2奥氏体基体中，并且在300℃进行局部罐头压缩的Ni_（50.9）Ti_（49.1）样品中观察到{114} B2奥氏体化合物孪晶，表明位错滑移和变形孪晶在300℃Ni_（5.9）Ti_（49.1）合金的局部罐头压缩中起重要作用。

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  • 来源
    《Materials Science and Engineering》 |2016年第13期|1-10|共10页
  • 作者

    Li Hu; Shuyong Jiang; Siwei Liu; Yanqiu Zhang; Yanan Zhao; Chengzhi Zhao;

  • 作者单位

    College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China ,College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;

    College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China;

    Hubei Water Resources Research Institute, Wuhan 430070, China;

    College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China;

    College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China;

    College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;

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  • 正文语种 eng
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  • 关键词

    Electron microscopy; Shape memory alloys; Phase transformation; Twinning;

    机译：电子显微镜;形状记忆合金;相变;结对;

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