1、Designation:F200417Standard Test Method forTransformation Temperature of Nickel-Titanium Alloys byThermal Analysis1This standard is issued under the fixed designation F2004;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method defines procedures for determining thetransformation temperatures of nickel-titanium shape memoryalloys,pr
3、oduced in accordance with Specification F2063,bydifferential scanning calorimetry.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with
4、its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and todetermine the applicability of regulatory limitations prior touse.1.4 This international standard was developed in accor-dance with internationally recognized princi
5、ples on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2E177 Practice for Use of the Terms Pr
6、ecision and Bias inASTM Test MethodsE473 Terminology Relating to Thermal Analysis and Rhe-ologyE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE967 Test Method for Temperature Calibration of Differen-tial Scanning Calorimeters and Differential Thermal
7、Ana-lyzersE1142 Terminology Relating to Thermophysical PropertiesF2005 Terminology for Nickel-Titanium Shape MemoryAlloysF2063 Specification for Wrought Nickel-Titanium ShapeMemory Alloys for Medical Devices and Surgical Im-plantsF2082 Test Method for Determination of TransformationTemperature of Ni
8、ckel-Titanium Shape Memory Alloysby Bend and Free Recovery3.Terminology3.1 Specific technical terms used in this test method arefound in Terminologies E473,E1142,and F2005.4.Summary of Test Method4.1 This test method involves heating and cooling a testspecimen at a controlled rate in a controlled en
9、vironmentthrough the temperature interval of the phase transformation.The difference in heat flow between the test material and areference material due to energy changes is continuouslymonitored and recorded.Absorption of energy due to a phasetransformation in the specimen results in an endothermic
10、peakon heating.Release of energy due to a phase transformation inthe specimen results in an exothermic peak on cooling.5.Significance and Use5.1 Differential scanning calorimetry provides a rapidmethod for determining the transformation temperature(s)ofnickel-titanium shape memory alloys.5.2 This te
11、st method uses small,stress-free,annealedsamples to determine whether a sample of nickel-titanium alloycontaining nominally 54.5 to 57.0%nickel by weight isaustenitic or martensitic at a particular temperature.Sincechemical analysis of these alloys does not have sufficientprecision to determine the
12、transformation temperature bymeasuring the nickel-to-titanium ratio of the alloy,directmeasurement of the transformation temperature of an annealedsample of known thermal history is recommended.5.3 This test method is useful for quality control,specifica-tion acceptance,and research.5.4 Transformati
13、on temperatures derived from differentialscanning calorimetry(DSC)may not agree with those obtained1This test method is under the jurisdiction ofASTM Committee F04 on Medicaland Surgical Materials and Devices and is the direct responsibility of SubcommitteeF04.15 on Material Test Methods.Current edi
14、tion approved Oct.1,2017.Published October 2017.Originallyapproved in 2000.Last previous edition approved in 2016 as F2004 16.DOI:10.1520/F2004-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards vo
15、lume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardi
16、zation established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 by other test methods due to the effects of strain and load on thetransformation.For example,transformation temperaturesmeasured in accordance with Test Method F2082 will differfrom those measured by the current standard.5.5 The use of this test method for finished or semi-finishedcomponents wi
