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Additive Manufacturing of NiTiHf High Temperature Shape Memory AlloyAdditive manufacturing of a NiTi-20Hf high temperature shape memory alloy (HTSMA) was investigated. A selective laser melting (SLM) process by Phenix3D Systems was used to develop components from NiTiHf powder (of approximately 25-75 m particle fractions), and the thermomechanical response was compared to the conventionally vacuum induction skull melted counterpart. Transformation temperatures of the SLM material were found to be slightly lower due to the additional oxygen pick up from the gas atomization and melting process. The shape memory response in compression was measured for stresses up to 500 MPa, and transformation strains were found to be very comparable (Up to 1.26 for the as-extruded; up to 1.52 for SLM).
Document ID
20170006032
Document Type
Technical Memorandum (TM)
Authors
Benafan, Othmane
(NASA Glenn Research Center Cleveland, OH United States)
Bigelow, Glen S.
(NASA Glenn Research Center Cleveland, OH United States)
Elahinia, Mohammad
(Toledo Univ. OH, United States)
Moghaddam, Narges Shayesteh
(Toledo Univ. OH, United States)
Amerinatanzi, Amirhesam
(Toledo Univ. OH, United States)
Saedi, Soheil
(Kentucky Univ. Lexington, KY, United States)
Toker, Guher Pelin
(Kentucky Univ. Lexington, KY, United States)
Karaca, Haluk
(Kentucky Univ. Lexington, KY, United States)
Date Acquired
July 3, 2017
Publication Date
June 1, 2017
Subject Category
Mechanical Engineering
Report/Patent Number
NASA/TM-2017-219523
GRC-E-DAA-TN43084
E-19382
Funding Number(s)
CONTRACT_GRANT: NNC16VA75P
WBS: WBS 109492.02.03.02.01
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
NiTiHf; High Temperature Shape Memory Alloys; Additive Manufacturing; Actuators

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