SMST 2019 abstract: NiTiHfNb high-temperature shape memory alloys

2019年4月8日
Source: ASM International

Published by

Nickel-rich NiTiHf alloys have recently been investigated to achieve higher transformation temperatures and open new application opportunities in aerospace, automotive, and energy industries. However, many challenging aspects must still be considered to have a viable, robust, economic, and reliable engineered solution. First, depending on the application requirements, tuning of the transformation temperature and transformation behavior through chemistry and processing is desirable.

Another critical factor in determining a new HTSMAs viability is whether or not the alloy can be thermo-mechanically processed for good work output and dimensional stability. In this regard, the poor workability of NiTiHf alloys is a serious problem. Some ternary element additions to binary NiTi, including Hf, increase hardness and decrease cold workability and ductility. Control of the chemistry and improvement of the cold workability of these alloys is crucial for manufacturing them into suitable sizes and shapes and for microstructure tuning.

在这项工作中,我们will present results on NiTiHf alloys with addition of niobium as a suitable element to improve cold workability. The effects of such addition on chemistry as well as on functional shape memory properties will be described. Microstructural features unique to these quaternary alloys will also be discussed.

Abstract ofNiTiHfNb High-Temperature Shape Memory Alloys,byDr. Alberto Coda, Dr. Jannis Lemke, Mr. Alessandro Gallitognotta, Dr. Federico Gallino, SAES Getters S.p.A., Lainate, Italy.

Dr. Weimin Yin, Mr. Frank Sczerzenie, SAES Smart Materials, New Hartford, N.Y.

https://www.saesgetters.com/saes-smart-materials-inc

Presentation is fromSMST 2019, May 13 – 17, Kostanz, Germany

//www.thepushbroom.com/web/smst-2019/registration