ASTM F2005-21

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F2005 − 21
Standard Terminology for
1
Nickel-Titanium Shape Memory Alloys
This standard is issued under the fixed designation F2005; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This terminology is a compilation of definitions of terms
active austenite finish temperature, n—term used to denote
used in ASTM documents relating to nickel-titanium shape
the austenite finish temperature of an aged, shape-set or
memory alloys used for medical devices. This terminology
tempered wire, tube, or component as determined by (1)a
includesonlythosetermsforwhichASTMeitherhasstandards
bend and free recovery (BFR) method pursuant to Test
orwhichareusedinASTMstandardsfornickel-titaniumshape
Method F2082,(2) by a uniform prestrain and free recovery
memory alloys. It is not intended to be an all-inclusive list of
(UPFR) method pursuant to Test Method E3098,or(3)
terms related to shape memory alloys.
another method as agreed upon between purchaser and
supplier rather than by calorimetry (DSC) pursuant to Test
1.2 Definitionsthataresimilartothosepublishedbyanother
standards body are identified with abbreviations of the name of Method F2004.
that organization; for example, ICTAC is the International
age, v—to heat treat at a low to intermediate temperature,
Confederation for Thermal Analysis and Calorimetry.
typically in the range of 300 °C to 575 °C, usually for an
1.3 This international standard was developed in accor-
extended period of time, to form precipitates and/or adjust
dance with internationally recognized principles on standard-
transformation temperatures and thermoelastic properties.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- alloy phase, n—in a shape memory alloy, the crystal structure
mendations issued by the World Trade Organization Technical stable at a particular temperature and stress.
Barriers to Trade (TBT) Committee.
anneal, v—to heat treat at a temperature above the recrystal-
lization temperature, typically in the range of 700 °C to
2. Referenced Documents
950 °C, in order to essentially remove the effects of hot
2
2.1 ASTM Standards:
and/or cold working and dissolve precipitates.
E7 Terminology Relating to Metallography
E473 Terminology Relating to Thermal Analysis and Rhe-
austenite,n—the high temperature parent phase in Ni-Ti shape
ology
memory alloys with a B2 crystal structure. This phase
E3098 Test Method for Mechanical Uniaxial Pre-strain and
transforms to R-phase or martensite on cooling.
Thermal Free Recovery of Shape Memory Alloys
austenite finish temperature (A ), n—the temperature at
f
F2004 Test Method for Transformation Temperature of
which the martensite to austenite transformation is com-
Nickel-Titanium Alloys by Thermal Analysis
pleted on heating in a single-stage transformation (Fig. 1)or
F2082 Test Method for Determination of Transformation
the temperature at which the R-phase to austenite transfor-
Temperature of Nickel-Titanium Shape Memory Alloys
mation is completed on heating in a two-stage transforma-
by Bend and Free Recovery
tion (Fig. 2).
F2516 Test Method for Tension Testing of Nickel-Titanium
Superelastic Materials
austenite peak temperature (A ), n—the temperature of the
p
endothermic peak position on the differential scanning
calorimeter (DSC) curve upon heating for the martensite to
1
ThisterminologyisunderthejurisdictionofASTMCommittee F04onMedical
austenite transformation in a single-stage transformation
and Surgical Materials and Devices and is the direct responsibility of Subcommittee
(Fig. 1) or the temperature of the endothermic peak position
F04.12 on Metallurgical Materials.
Current edition approved March 1, 2021. Published March 2021. Originally
on the DSC curve upon heating for the R-phase to austenite
approved in 2000. Last previous edition approved in 2015 as F2005 – 05 (2015).
transformation in a two-stage transformation (Fig. 2).
DOI: 10.1520/F2005-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
austenite start temperature (A ),n—the temperature at which
s
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
the martensite to austenite transformation begins on heating
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. in a single-stage transformation (Fig. 1) or the temperature at
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