摘要、关键词、研究目的、结论修改稿

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1、Ti-Ni基形状记忆合金相变行为研究李小彬（陕西理工材料科学与工程学院金属材料工程专业09级2班，汉中）指导教师：贺志荣[摘要]用示差扫描量热仪和光学显微镜分别研究了350-700℃退火态Ti-50Ni，Ti-50.1Ni，Ti-45Ni-5Cu，Ti-45Ni-5Cu-0.3Cr形状记忆合金的相变行为和显微组织；用拉伸试验研究了400-600℃退火态Ti-50.8Ni-0.3Cr形状记忆合金的形变行为。结果表明，随退火温度Tan升高，合金的组织从纤维状变成等轴状，再结晶温度在600℃左右。对于Ti-50Ni和Ti-50.1Ni合金，当Tan=350-550℃时，发生A→R→

2、M/M→R→A型相变，相变温度比较稳定；Tan=600-700℃时，发生A→M/M→A型相变，相变温度增加；Ti-50Ni合金的相变温度高于Ti-50.1Ni合金。对于Ti-45Ni-5Cu和Ti-45Ni-5Cu-0.3Cr合金，当Tan=350-700℃时，发生A→M/M→A型相变；随Tan升高，合金的相变升高；Ti-45Ni-5Cu合金的相变温度高于Ti-45Ni-5Cu-0.3Cr合金。室温下，400-600℃退火态Ti-50.8Ni-0.3Cr合金呈超弹性。400℃退火态合金超弹性最稳定，500℃退火态合金应力-应变回线面积最大，600℃退火态合金的超弹性稳定性最差

3、。[关键词]Ti-Ni合金；形状记忆合金；显微组织；相变；形变StudyontransformationbehaviorsofTi-NibasedshapememoryalloysLiXiao-bin(Grade09,Class2,MajorofMetallicMaterialsEngineering,SchoolofMaterialsScienceandEngineering,ShaanxiUniversityofTechnology,Hanzhong)Tutor:HeZhi-rong[Abstract]Thetransformationbehaviorsandthemic

4、rostructureofTi-50Ni,Ti-50.1Ni,Ti-45Ni-5CuandTi-45Ni-5Cu-0.3Crshapememoryalloyswerestudiedbydifferentialscanningcalorimetryandopticalmicroscopy,respectively.ThedeformationbehaviorsofTi-50.8Ni-0.3Crshapememoryalloywereinvestigatedbytensiletesting.Theresultsshowthatwithincreasingannealingtemp

5、eratureTan,themicrostructureofthealloysischangefromfibroustoequiaxialgrain,andtherecrystallizationtemperatureisabout600℃.ForTi-50NiandTi-50.1Nialloys,theA→R→M/M→R→AtypetransformationoccurswhenTan=350-550℃,andthetransformationtemperaturesarestable;theA→M/M→AtypetransformationoccurswhenTan=60

6、0-700℃,andthetransformationtemperaturesareincrease.ThetransformationtemperatureofTi-50NialloyishigherthanthatofTi-50.1Nialloy.ForTi-45Ni-5CuandTi-45Ni-5Cu-0.3Cralloys,theA→M/M→AtypetransformationoccurswhenTan=350-700℃,andwithincreasingTan,thetransformationtemperaturesareincrease.Thetransfor

7、mationtemperatureofTi-45Ni-5CualloyishigherthanthatofTi-45Ni-5Cu-0.3Cralloy.The400-600℃annealedTi-50.8Ni-0.3Cralloyshowssuperelasticityatroomtemperature.Thesuperelasticityismoststablein400℃annealedTi-50.8Ni-0.3Cralloy,theloopareaislargestin400℃annealedal