SYMPOSIA PAPER Published: 01 January 1975

Cryogenic Toughness Through Microstructure Control in an Iron-Nickel-Titanium Alloy


This paper discusses the selection of composition and processing of an iron-nickel-titanium (Fe-Ni-Ti) alloy having a favorable combination of strength and toughness at cryogenic temperatures. Criteria on alloy composition lead to the choice of low interstitial Fe-12Ni-0.25Ti. The alloy has a naturally favorable microstructure, but cryogenic toughness must be imparted through grain refinement. Several alternate procedures are identified; four of these are discussed in detail, along with the resulting tensile properties at 77 K, Charpy impact energies at 77 and 5 K, and behavior in fracture toughness tests at 77 K. Alloys are obtained having yield strengths to 150 ksi with excellent impact toughness to 5K.

Author Information

Jin, S
University of California, Berkeley, Calif.
Whitaker, B
University of California, Berkeley, Calif.
Morris, JW
University of California, Berkeley, Calif.
Zackay, VF
University of California, Berkeley, Calif.
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Developed by Committee: E50
Pages: 348–360
DOI: 10.1520/STP29168S
ISBN-EB: 978-0-8031-4659-4
ISBN-13: 978-0-8031-0538-6