The Measurement and Interpretation of Transformation Temperatures in Nitinol

被引：41

作者：

Duerig T.W. ^{[1
]}

Pelton A.R. ^{[2
]}

Bhattacharya K. ^{[3
]}

机构：

[1] Nitinol Devices and Components, 47533 Westinghouse Dr., Fremont, 94539, CA

[2] G.RAU Inc., 3350 Scott Blvd. Bldg. 37B, Santa Clara, 95054, CA

[3] Division of Engineering and Applied Sciences, California Institute of Technology, Pasadena, 91125, CA

来源：

Shape Memory and Superelasticity | 2017年 / 3卷 / 04期

关键词：

Aging; Martensite; NiTi < Materials; Phase diagram; R-phase; Superelasticity;

D O I：

10.1007/s40830-017-0133-0

中图分类号：

学科分类号：

摘要：

A previous paper (Duerig and Bhattacharya in Shap Mem Superelasticity 1:153–161, 2015) introduced several engineering considerations surrounding the R-phase in Nitinol and highlighted a common, if not pervasive, misconception regarding the use of the term Af by the medical device industry. This paper brings additional data to bear on the issue and proposes more accurate terminology. Moreover, a variety of tools are used to establish the forward and reverse stress–temperature phase diagrams for a superelastic wire typical of that used in medical devices. Once established, the two most common methods of measuring transformation temperatures, Differential Scanning Calorimetry and Bend Free Recovery, are tested against the observed behavior. Light is also shed upon the origin of the Clausius–Clapeyron ratio (dσ/dT), the triple point, and why such large variations are reported in superelastic alloys. © 2017, ASM International.

引用

页码：485 / 498

页数：13

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