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Hardness and Second Phase Percentage of Ni-Ti-Hf Compounds After Heat Treatment at 700CThe Vickers hardness and second phase precipitation of three ternary intermetallic Ni-Ti-Hf compounds containing either 1, 3 or 5 at.% Hf were compared to 60-Nitinol (55 at.% Ni - 45 at.% Ti). Heat treatment either at 700 C or with a subsequent aging step, hardened the 3 and 5 at.% Hf-containing ternaries to approximately 620 HV (56 HRC). Heat treatment increased the hardness of the 1 at.% Hf compound by more than 25 percent. Average hardness of the 3 and 5 at.% Hf ternaries, though higher than that of the binary Ni-Ti or the Ni-Ti-Hf compound containing 1 at.% Hf, appeared to be fairly insensitive to the different heat treatments. There was a drastic reduction of fatigue-enhancing second phase precipitates for the 5 at.% Hf ternaries compared to the other compounds. These results should guide materials selection for development of aerospace componentry.
Document ID
20170001793
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Stanford, Malcolm K. (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
February 28, 2017
Publication Date
February 1, 2017
Subject Category
Metals And Metallic Materials
Report/Patent Number
GRC-E-DAA-TN37727
E-19334
NASA/TM-2017-219453
Funding Number(s)
WBS: WBS 109492.02.03.02.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
intermetallics
metallography
Vickers hardness
photomicrography

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