简介：Theeffectofthermalcyclingunderloadingonmartensitictransformationandtwo-wayshapememoryeffectwasinvestigatedforTi-49.8at.pctNialloy.ItisshownthatMsandMftemperatureincreasewithincreasingthenumberofcycles,whileAsandAftemperaturedecreaseduringthermalcycling.Thetotalstrainεtandpermanentstrainεpincreasewithincreasingappliedstressandnumberofcycles.Thetwo-wayshapememoryeffectcanbeimprovedbyproperthermalcyclingtrainingunderloading,whileexcessivelyhighappliedstressresultsinthedeteriorationofTWSME.Thereasonforthechangesinmartensitictransformationcharacteristicsandtwo-wayshapememoryeffectduringthermalcyclingunderloadingisdiscussedbasedontheanalysisofmicrostructurebyTEMobservations.
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