A New Prototype Two-Phase (TiNi)-(β-W) SMA System with Tailorable Thermal Hysteresis

被引：29

作者：

Buenconsejo, Pio John S. ^{[1
]}

Zarnetta, Robert ^{[1
]}

Koenig, Dennis ^{[1
]}

Savan, Alan ^{[1
]}

Thienhaus, Sigurd ^{[1
]}

Ludwig, Alfred ^{[1
]}

机构：

[1] Ruhr Univ Bochum, Inst Mat, D-44780 Bochum, Germany

来源：

ADVANCED FUNCTIONAL MATERIALS | 2011年 / 21卷 / 01期

关键词：

SHAPE-MEMORY ALLOYS; MARTENSITIC-TRANSFORMATION; PHASE-TRANSFORMATIONS; THIN-FILMS; BEHAVIOR; STRESS; CU;

D O I：

10.1002/adfm.201001697

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The Ti-Ni-W two-phase shape memory alloy (SMA) thin film system is presented as a prototype for new SMAs with tailorable thermal transformation hysteresis (Delta T). The concept is to combine the SMA TiNi with almost insoluble W to create the two-phase system (TiNi)-(beta-W). This system behaves like a pseudobinary TiNi system. Phase transformation behavior for compositions above the solubility limit of W in TiNi exhibit a B2-R phase transformation with characteristically small Delta T. Moreover, Delta T is dependent on the amount of W and it can be tailored to zero and even negative. This phenomenon is rationalized as being due to the mechanical interaction between the phases B2-TiNi and beta-W. The presented results are very promising for the development of high-speed Ti-Ni-based SMA actuators.

引用

页码：113 / 118

页数：6

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