|About this Abstract
||Materials Science & Technology 2019
||Ultra High Performance Metallic Systems for Aerospace, Defense, and Automotive Applications
||Cold Work-Induced Strain Glass States in Ni49.5Ti50.5 SMA Plates
||Neha John, Choongyep Lee, Nathan A. Ley, Jesse Smith, Robert W. Wheeler, Anit K. Giri, Marcus L. Young
|On-Site Speaker (Planned)
Shape memory alloys (SMAs) are characterized by i) the ability to return from large deformations to their original shape upon heating due to a phase transformation from martensite to austenite, i.e. the shape memory effect, and ii) high actuation densities. SMAs can be converted to strain glass alloys (SGAs) via processing-induced or compositionally-induced strain, where SGAs exhibit large amounts of recoverable strain due to a phase transformation from martensite to austenite through mechanical loading. However, unlike SMAs, SGAs do not show any phase transformation behavior from thermal cycling. In this study, the transformation from shape memory to strain glass is explored in Ni49.5Ti50.5 (at. %) plates. SMA samples were cold worked in 5% increments until a strain glass transition occurred. Prominent characteristics, like the grain size, enthalpy peaks, and crystallographic structure between the as-received and the cold worked materials are examined to improve understanding of the SMA to SGA transition.
||Definite: At-meeting proceedings