Designation:E2448−11StandardTestMethodforDeterminingtheSuperplasticPropertiesofMetallicSheetMaterials1ThisstandardisissuedunderthefixeddesignationE2448;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribestheprocedurefordetermin-ingthesuperplasticformingproperties(SPF)ofametallicsheetmaterial.ItincludestestsbothforthebasicSPFproper-tiesandalsoforderivedSPFproperties.Thetestforbasicpropertiesencompasseseffectsduetostrainhardeningorsoftening.1.2Thistestmethodcoverssheetmaterialswiththicknessesofatleast0.5mmbutnotgreaterthan6mm.Itcharacterizesthematerialunderauni-axialtensilestresscondition.NOTE1—Mostindustrialapplicationsofsuperplasticforminginvolveamulti-axialstressconditioninasheet;howeveritismoreconvenienttocharacterizeamaterialunderauni-axialtensilestresscondition.Testsshouldbeperformedindifferentorientationstotherollingdirectionofthesheettoascertaininitialanisotropy.1.3Thismethodhasbeenusedsuccessfullybetweenstrainratesof10-5to10-1persecond.1.4ThismethodhasbeenusedsuccessfullyonAluminumandTitaniumalloys.Theuseofthemethodwithothermetalsshouldbeverified.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E4PracticesforForceVerificationofTestingMachinesE6TerminologyRelatingtoMethodsofMechanicalTestingE21TestMethodsforElevatedTemperatureTensionTestsofMetallicMaterialsE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE646TestMethodforTensileStrain-HardeningExponents(n-Values)ofMetallicSheetMat...
