Microstructural design considerations in Fe-Mn-Al-Ni shape memory alloy wires: Effects of natural aging

abstract

• 2017 Acta Materialia Inc. In this study, FeMnAlNi shape memory alloys are demonstrated to experience room temperature (RT) aging, which manifests itself as a gradual increase in critical transformation stress with time when the sample is kept in a stress-free condition. This effect is sufficient to create superelasticity in the solution treated condition, which does not normally show superelasticity soon after heat treatment. This phenomenon is due to the nucleation and coarsening of nanoprecipitates at room temperature despite the high melting point of the alloy. RT aging also influenced precipitation hardened FeMnAlNi samples by causing an increase in stress hysteresis and hardening rate.

authors

• Karaman, Ibrahim

published proceedings

• SCRIPTA MATERIALIA

author list (cited authors)

• Ozcan, H., Ma, J. i., Karaman, I., Chumlyakov, Y. I., Santamarta, R., Brown, J., & Noebe, R. D.

citation count

• 31

complete list of authors

• Ozcan, H||Ma, Ji||Karaman, I||Chumlyakov, YI||Santamarta, R||Brown, J||Noebe, RD

publication date

• January 2018

publisher

• Elsevier  Publisher

published in

• Scripta Materialia  Journal

keywords

• Iron-based Shape Memory Alloys
• Martensitic Transformation
• Natural Aging
• Stress Induced Martensite
• Superelasticity

Digital Object Identifier (DOI)

• 10.1016/j.scriptamat.2017.07.033

start page

• 153

end page

• 157

volume

• 142

URL

• http://dx.doi.org/10.1016/j.scriptamat.2017.07.033