ASTM F2004-24 PDF

Full title and description

Standard Test Method for Transformation Temperature of Nickel‑Titanium Alloys by Thermal Analysis — ASTM F2004‑24. This test method specifies the use of thermal analysis (principally differential scanning calorimetry, DSC) to determine transformation temperatures and transformation enthalpies of nickel‑titanium (NiTi, Nitinol) shape‑memory alloys for quality control, specification acceptance, and research purposes.

Abstract

ASTM F2004‑24 defines quantitative procedures, sample conditions, and reporting conventions for measuring the martensitic/austenitic transformation temperatures and associated enthalpies in NiTi alloys using DSC. The method is intended for small, stress‑free, annealed or otherwise heat‑treated samples (including aged, shape‑set, or tempered conditions when agreed between purchaser and supplier). Results from DSC may differ from values obtained by alternate test methods due to strain/load effects; the standard notes this potential difference and cross‑references other ASTM test methods.

General information

• Status: Active (current published designation F2004‑24).
• Publication date: April 15, 2024 (published 2024; implementation dates shown by distributors also list 15 April 2024).
• Publisher: ASTM International.
• ICS / categories: 77.120.40 (Nickel, chromium and their alloys); 77.120.50 (Titanium and titanium alloys).
• Edition / version: F2004‑24 (current edition).
• Number of pages: 5 pages.

Scope

This test method provides procedures for quantitatively determining transformation temperatures (such as Ms, Mf, As, Af) and enthalpies of transformation for nickel‑titanium shape‑memory alloys produced in accordance with Specification F2063, using differential scanning calorimetry. It covers annealed and certain heat‑treated sample conditions and states SI units as standard. The standard also reminds users to consider safety and regulatory practices relevant to testing.

Key topics and requirements

• Measurement technique: differential scanning calorimetry (DSC) as the principal thermal analysis method.
• Measured outputs: transformation temperatures (Ms, Mf, As, Af or observer‑defined equivalents) and transformation enthalpies.
• Sample requirements: small, stress‑free specimens; recommended for alloys with nominal Ni content ranges discussed in the standard (example: nominally 54.5–57.0 % Ni is referenced for distinguishing austenitic vs martensitic states).
• Comparability note: results may not match values from other methods (strain/load dependent methods such as those described in other ASTM test methods).
• Reporting: temperatures, enthalpies, heating/cooling rates, sample preparation and heat‑treatment history must be reported per the method.

Typical use and users

Used by materials engineers, metallurgists, test laboratories, NiTi alloy manufacturers, medical device material suppliers, and researchers performing quality control, specification acceptance testing, product development, or regulatory submissions involving NiTi (Nitinol) components. The method is particularly relevant for medical and surgical materials and devices where NiTi transformation behavior affects device performance.

Related standards

Commonly referenced standards include ASTM F2063 (Specification for Nickel‑Titanium Shape Memory Alloys), ASTM F2005 (Terminology related to shape‑memory/heat‑treat conditions), and other ASTM test methods addressing transformation behavior (for example, Test Method F2082 and related documents). Users should consult the normative and informative references listed in the standard for full cross‑references.

Keywords

differential scanning calorimetry; DSC; nickel‑titanium; NiTi; Nitinol; TiNi; shape‑memory alloy; transformation temperature; enthalpy; Ms/Mf/As/Af.

FAQ

Q: What is this standard?

A: ASTM F2004‑24 is a Standard Test Method that specifies procedures for measuring transformation temperatures and transformation enthalpies of nickel‑titanium alloys by thermal analysis (primarily DSC).

Q: What does it cover?

A: It covers sample preparation expectations, DSC test procedures, required reporting (temperatures, enthalpies, rates, sample history), and scope limits (NiTi shape‑memory alloys produced per F2063 and certain heat‑treated conditions). It also notes that DSC results can differ from strain/load‑sensitive test methods.

Q: Who typically uses it?

A: Materials and test laboratories, NiTi producers and converters, medical device material engineers, and researchers who need reproducible transformation temperature and enthalpy data for NiTi alloys.

Q: Is it current or superseded?

A: As published it is the current active designation F2004‑24 (publication in 2024). ASTM lists the F2004‑24 designation as active; a follow‑on ASTM work item (WK92855) for revision has been recorded, indicating ongoing maintenance activity. Users should confirm status with ASTM for any updates after the 2024 edition.

Q: Is it part of a series?

A: It is part of the ASTM F04 committee suite of documents covering shape‑memory alloys and medical materials; it cross‑references related specifications and terminology (for example F2063 and F2005) and is used alongside other ASTM test methods for complete evaluation.

Q: What are the key keywords?

A: DSC, differential scanning calorimeter, NiTi, Nitinol, TiNi, transformation temperature, transformation enthalpy, shape‑memory alloy.