|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Transformation and Deformation Characterization of NiTiHf and NiTiAu High Temperature Shape Memory Alloys
||Lee Casalena, Daniel Robert Coughlin, Fan Yang, Xiang Chen, Santo A Padula, Glen S Bigelow, Darrell J Gaydosh, Othmane Benafan, Ronald D Noebe, Yunzhi Wang, Peter M Anderson, Michael J Mills
|On-Site Speaker (Planned)
NiTiHf and NiTiAu are potentially viable candidates amongst an emerging class of high temperature shape memory alloys (HTSMAs), exhibiting properties conducive to actuator applications in demanding automotive and aerospace environments. NiTiHf can be tailored to achieve a highly favorable balance of properties, including high strength, stability and work output at temperatures approaching 300C, yet at a reduced cost compared to Pt, Pd, and Au containing counterparts. NiTiAu shows potential for work output at much higher temperatures – where the benefits may offset cost – but additional research is needed. This research focuses on developing a fundamental understanding of the inherent microstructure-property relationships for these NiTi-based HTSMAs. Advanced electron characterization techniques are used to explore the effects of structure, coherency, chemistry, and plasticity on alloy behavior. These insights are incorporated into microstructural modeling frameworks to understand how phase transformations and time-dependent plasticity interact under isothermal deformation and load-biased thermal cycling conditions.
||Planned: A print-only volume