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1、第43卷第9期今扁學(xué)玻V61.43No.92007年9月第930一936頁ACTAMETALLURGICASINICASePt.2007PP.93于936’一NiTi形狀記憶合金熱壓縮變形行為及本構(gòu)關(guān)系張紅鋼何勇劉雪峰謝建新,(北京科技大學(xué)材料科學(xué)與工程學(xué)院北京10083)、,摘要采用熱模擬實驗在變形溫度為700一900℃應(yīng)變速率為10一“一1015一‘的條件下對Ni一Ti合金的熱壓縮變形.行為,;及變形組織進行了分析采用實測數(shù)據(jù)回歸分析方法得出雙曲正弦函數(shù)形式本構(gòu)方程中的材料參數(shù)將材料參數(shù)對應(yīng)變進行.,、二次擬合建立了Ni一Ti合金熱變形過程的流變應(yīng)力與變形溫度應(yīng)變速率和應(yīng)變的本構(gòu)關(guān)系變形
2、激活能Q和結(jié)構(gòu)因子A隨.應(yīng)變的增加而減小,應(yīng)力指數(shù)n隨應(yīng)變的增加呈線性增加有序一無序間的相互轉(zhuǎn)變以及動態(tài)回復(fù)或動態(tài)再結(jié)晶的綜合作用,是.N卜Ti合金的熱壓縮變形真應(yīng)力一真應(yīng)變曲線變化規(guī)律不同于傳統(tǒng)非金屬間化合物材料的主要原因,,,關(guān)銳詞Ni一Ti合金熱壓縮變形本構(gòu)關(guān)系流變應(yīng)力中圖法分類號TG139文獻標(biāo)識碼A文章編號0412一1961(2007)09一0930一07HOTDEFORMATIONBEHAVIORANDCONSTITUTIVERELATIONSHIPOFNi一TiSHAPEMEMORYALLOYDURINGCOMPRESSIONATELEVATEDTE入IPERATURESoan
3、,,,an。Z月通NGHogg月刀Yo即LIU而el仰尤工召五xiSehoolofMaterialseeneeandEnginri,nirsofSeieneeandehnoogyBeing,Being100083Sie吧UveityTelijij,...Coondent:尤工召五a。蕊。,P,’o.ssor,l:(0,。忍,s忍忍劃oa蔥l:劣。aterostbeoen二sPleTe0)E-J蕊@。du。:eooaaseesea.,虧”tdb夕t‘lB‘Roho夕、二ofCh‘na‘NO忍00‘忍“onalt。、1ScienceNa介朋哪0)NaNaonaon。a05.aodt£ofCh蔥5
4、刀娜?!眃5005本。,0)aodP陽夕二。fora。厲云a仰Sehola。FO(NCha”e.d玩“O”at該”eRsea二hTea。‘n£。e?!畉,。扭oanuseriPtei2007一01一16,inrevisedfo2007一0Un5一21陰Toj7)MrecvedrmABSTRACTThehotdefoationbehaviorofNi一TialloywasstudiedbyeomPressivedemationrm,fortestsinthestralnraterangeof10一3一1015一1andtemperaturerageof700一900℃andtheassoeia
5、tedstrueturalehangeswereinvestigatedbymetallographyandTEM.Byusingregressionanalysismethodsbasedonmeureddata,thematalaetsntherrenus一PeoeneeuationreaseriprameriAhityhyperbli一iqwe.resolved,andenuseoerationstranseontheanass,aconstitutiveequnthdtfitdfomiBasdabovelyiatio,.whiehrelatedthefistresstotemPera
6、turestrainrateandstrainwasestablishedTheactivationow,,,.,,energy,dstrueturefaetorAdecreethestrnnereeserthestresseone。,QanasasaiiasHowvexPntlinearlyinereaseswiththeinereaseofthestrain.Themainreasonsthatleadtothedifereneebetweenthetruestress一truestraineurvesofNi一Tialloyandnon-intermetalliematerialsar
7、etheorder一disorder.reeiproealtransitionandnamiereeryordyniereerystallizationdy,ovearn,,KEYORDSNi一TialloyhoteomPressiondeformationeonstitutiverelationshipflstressWowNi一Ti形狀記憶合金因同時具有優(yōu)良的形狀記憶功有廣泛用途.但是,傳統(tǒng)的制備N一Ti