ASTM F2005-00
(Terminology)Standard Terminology for Nickel-Titanium Shape Memory Alloys
Standard Terminology for Nickel-Titanium Shape Memory Alloys
SCOPE
1.1 This terminology is a compilation of definitions of terms used in ASTM documents relating to nickel-titanium shape memory alloys used for medical devices. This terminology includes only those terms for which ASTM either has standards or which are used in ASTM standards for nickel-titanium shape memory alloys. It is not intended to be an all-inclusive list of terms related to shape memory alloys.
1.2 Definitions that are similar to those published by another standards body are identified with abbreviations of the name of that organization, for example, ICTAC is the International Confederation for Thermal Analysis and Calorimetry.
1.3 A definition is a single sentence with additional information included in a discussion. This standard is reviewed every five years, and the year of the last revision is appended.
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Designation:F2005–00
Standard Terminology for
Nickel-Titanium Shape Memory Alloys
This standard is issued under the fixed designation F 2005; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This terminology is a compilation of definitions of terms
used in ASTM documents relating to nickel-titanium shape
memory alloys used for medical devices. This terminology
includesonlythosetermsforwhichASTMeitherhasstandards
orwhichareusedinASTMstandardsfornickel-titaniumshape
memory alloys. It is not intended to be an all-inclusive list of
terms related to shape memory alloys.
1.2 Definitionsthataresimilartothosepublishedbyanother
standards body are identified with abbreviations of the name of
that organization, for example, ICTAC is the International
Confederation for Thermal Analysis and Calorimetry.
1.3 A definition is a single sentence with additional infor-
mation included in a discussion. This standard is reviewed
every five years, and the year of the last revision is appended.
2. Referenced Documents
FIG. 1 DSC Graph for Single-Stage Transformation
2.1 ASTM Standards:
E 7 Terminology Relating to Metallography
3 the temperature at which the R-phase to austenite transfor-
E 473 Terminology Relating to Thermal Analysis
mation is completed on heating in a two-stage transforma-
3. Terminology tion (Fig. 2).
austenite peak temperature (A ), n—the temperature of the
p
alloy phase, n—in a shape memory alloy, the crystal structure
endothermic peak position on the differential scanning
stable at a particular temperature and stress.
calorimeter (DSC) curve upon heating for the martensite to
anneal, v—to heat treat in order to remove the effects of
austenite transformation in a single-stage transformation
cold-working or aging heat treatments, or both.
(Fig. 1) or the temperature of the endothermic peak position
DISCUSSION—Annealing shall be at a minimum temperature of 800°C
on the DSC curve upon heating for the R-phase to austenite
for a minimum time of 15 min followed by rapid cooling by water
transformation in a two-stage transformation (Fig. 2).
quenching, gas quenching, or air cooling.
austenite start temperature (A ), n—the temperature at
s
which the martensite to austenite transformation begins on
austenite, n—the highest temperature phase in Ni-Ti shape
heating in a single-stage transformation (Fig. 1) or the
memory alloys.
temperatureatwhichtheR-phasetoaustenitetransformation
DISCUSSION—In Ni-Ti the high-temperature phase has the B2 body-
begins on heating in a two-stage transformation (Fig. 2).
centered cubic crystal structure.
differential scanning calorimeter (DSC), n—a device which
austenite finish temperature (A ), n—the temperature at
is capable of heating a test specimen and a reference at a
f
which the martensite to austenite transformation is com- controlled rate and of automatically measuring the difference
pleted on heating in a single-stage transformation (Fig. 1) or
in heat flow between the specimen and the reference both to
the required sensitivity and precision.
differential scanning calorimetry (DSC), n—a technique in
which the difference in heat flow into or out of a substance
This terminology is under the jurisdiction ofASTM Committee F-4 on Medical
and Surgical Devices and is the direct responsibility of Subcommittee F04.12 on
and an inert reference is measured as a function of tempera-
Metallurgical Materials.
ture while the substance and the reference material are
Current edition approved Jan 10, 2000. Published April 2000.
subjected to a controlled temperature program.
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 14.02. (E 473) (ICTAC) (1993)
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F2005–00
conditions. The crystal lattice of the R-Phase is a rhombohedral
distortion of the cubic austenite crystal lattice structure, hence the name
“R-phase.”
R-phase finish temperature (R ), n—the temperature at
f
which the transformation from austenite to R-phase is
completed on cooling in a two-stage transf
...
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