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Precipitate Phases in Several High Temperature Shape Memory Alloys.

机译：几种高温形状记忆合金中的析出相。

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摘要

Initiated by the aerospace industry, there has been a great interest to develop high temperature shape memory alloys (HTSMAs) for actuator type of application at elevated temperatures. Several NiTi based ternary systems have been shown to be potential candidates for HTSMAs and this work focuses on one or more alloys in the TiNiPt, TiNiPd, NiTiHf, NiPdTiHf systems.;The sheer scope of alloys of varying compositions across all four systems suggests that the questions raised and addressed in this work are just the tip of the iceberg. This work focuses on materials characterization and aims to investigate microstructural evolution of these alloys as a function of heat treatment. The information gained through the study can serve as guidance for future alloy processing.;The emphasis of this work is to describe novel precipitate phases that are formed under aging in the ternary systems and one quaternary system. Employing conventional transmission electron microscopy (TEM), high resolution high angle annular dark field (HAADF) scanning transmission electron microscopy (STEM), 3D atom probe tomography (3D APT), as well as ab initio calculations, the complete description of the unit cell for the new precipitates was determined. The methodology is summarized in the appendix to help elucidate some basics of such a process.
机译：由航空航天工业引起的，人们对于开发高温形状记忆合金（HTSMAs）引起了极大的兴趣，这种形状记忆合金用于高温下的执行器类型应用。已显示几种基于NiTi的三元体系可能是HTSMA的潜在候选者，这项工作着重于TiNiPt，TiNiPd，NiTiHf，NiPdTiHf体系中的一种或多种合金。在这项工作中提出和解决的问题只是冰山一角。这项工作的重点是材料的表征，旨在研究这些合金的微观组织演变与热处理的关系。通过这项研究获得的信息可以为将来的合金加工提供指导。这项工作的重点是描述在三元体系和一个四元体系的时效作用下形成的新型沉淀相。使用常规透射电子显微镜（TEM），高分辨率大角度环形暗场（HAADF）扫描透射电子显微镜（STEM），3D原子探针层析成像（3D APT）以及从头算起，对晶胞进行完整描述确定了新的沉淀。附录中总结了该方法，以帮助阐明该过程的一些基础知识。

著录项

  • 作者

    Yang, Fan.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Physics High Temperature.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 151 p.
  • 总页数 151
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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