Ni_(47)Ti_(44)Nb_9宽滞后合金特征相变温度的影响机制
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摘要
采用真空感应法制备高铌含量Ni47Ti44Nb9形状记忆合金,结合差示扫描量热法、金相显微镜、扫描电镜,探索了热处理制度对马氏体相变温度的影响。结果表明,Ni47Ti44Nb9合金在300℃以前或400℃以后处理,相变温度As、Af、Ms、Mf变化很小,而在300～400℃处理,相变温度As、Af、Ms、Mf呈近似线性上升,即300～400℃是Ni47Ti44Nb9合金相变温度调节工艺敏感温度区间。相变焓的变化与马氏体转变开始温度Ms呈相反趋势,即Ms随热处理温度的升高而递增,相变焓则呈递减趋势。组织分析表明,在300～400℃进行处理,由于发生了动态再结晶,所以马氏体相变及其逆相变温度发生明显变化。因而,300～400℃的特征相变处理温度区间对Ni47Ti44Nb9合金的加工、热处理具有重要的意义。
Ni47Ti44Nb9 shape memory alloy was produced by high frequency vaccum induction furnace.Using DSC,metalloscope,SEM,the influence of differenct heat treatment on martensite temperature(Ms) and its microstructure mechanism were studied.The results show that: in the process of exploring the effect of heat treatment temperature on martensitic phase transformation and reverse transformation,a sensitive temperature can be testified between 300-400 ℃.When the heat treatment sets forth in this sensitive temperature,the phase transformation temperature is increasing obviously.Nevertheless,when the heat treatment temperature is higher or lower than the sensitive temperature,the phase composition of Ni47Ti44Nb9 alloy has nearly no change.On the other hand,it shows a reverse result for phase transforming enthalpy ΔH comparing with the Ms,namely the value of ΔH is decreasing but the Ms increases with the increase of heat treatment temperature.The microstructure analysis shows that because of the increasing of Ni/Ti atomic proportion due to the solution of element Nb,the Ms increases among 300-400℃.The characteristic heat treatment process for Ni47Ti44Nb9 alloy whose phase change temperature can be adjusted only at 300-400℃ has great significance to its engineering application.
Ni47Ti44Nb9 shape memory alloy was produced by high frequency vaccum induction furnace.Using DSC,metalloscope,SEM,the influence of differenct heat treatment on martensite temperature(Ms) and its microstructure mechanism were studied.The results show that: in the process of exploring the effect of heat treatment temperature on martensitic phase transformation and reverse transformation,a sensitive temperature can be testified between 300-400 ℃.When the heat treatment sets forth in this sensitive temperature,the phase transformation temperature is increasing obviously.Nevertheless,when the heat treatment temperature is higher or lower than the sensitive temperature,the phase composition of Ni47Ti44Nb9 alloy has nearly no change.On the other hand,it shows a reverse result for phase transforming enthalpy ΔH comparing with the Ms,namely the value of ΔH is decreasing but the Ms increases with the increase of heat treatment temperature.The microstructure analysis shows that because of the increasing of Ni/Ti atomic proportion due to the solution of element Nb,the Ms increases among 300-400℃.The characteristic heat treatment process for Ni47Ti44Nb9 alloy whose phase change temperature can be adjusted only at 300-400℃ has great significance to its engineering application.
引文
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[14]刘书芹,袁志山,王江波.热变形对TiNi形状记忆合金丝材力学性能以及超弹性的影响[J].热加工工艺,2007,36(22):21-23.
[2]Abramov V Y,Aleksandrova N M,Borovkov D V,et al.Materials Science and Engineering,2006,A438-440:553-557.
[3]He X M,Rong L J,Yan D S,et al.TiNiNb wide hesteresisshape memory alloy with low niobium content[J].MaterialsScience and Engineering,2004,A371:193-197.
[4]陶斌武,刘建华,李松梅.形状记忆合金Ni-(47)Ti-(44)Nb-9的抗高温氧化性能[J].金属学报,2005,41(6):663-637.
[5]蔡伟.Ni-Ti-Nb记忆合金应变恢复特性与形变马氏体的逆转变[D].哈尔滨:哈尔滨工业大学,1994.
[6]Zhang C S,Wang Y Q,Cai W,et al.The study ofconstitutional phases in a Ni47Ti44Nb9 shape memory alloy[J].Mater.Chem.Phys.,1991,28:43-47.
[7]程江辉,夏明六,马立群.形状记忆合金Ni53Ga27Fe17Co3的内耗研究[J].热加工工艺,2011,40(24):84-85.
[8]Zhao L C,Zhang C S,Cai W.Proceedings of the SymposiaH:Shape Memory Materials[A].The 3rd IUMRS InternationalConference on Advanced Materials[C].Tokyo:1993.1081-1084.
[9]Yang J H,Simpson J W,Stress-induced Transformation andSuperelasticity in Ni-Ti-Nb alloys[J].Journal of Physique,1995,5:771-776.
[10]Zheng Y F,Cai W,Wang Y Q,et al.Effect of heat treatmenton the transformation temperature and the microstructure ofNi-Ti-Nb shape memory alloy[J].J.Mater.Sci.Technol.,1998,14:37-40.
[11]肖甫,赵新清,徐惠彬,等.(NiTi)50-0.5xNbx形状记忆合金的阻尼性能及力学性能[J].金属学报,2009,45(1):18-24.
[12]赵飞,秦路平,魏志坚.C-250马氏体时效钢逆变奥氏体再结晶温度的测定[J].热加工工艺,2011,40(12):45-47.
[13]洪起虎,王二敏,刘大博,等.冷却速度对NiTiNb宽滞后记忆合金相变温度的影响[J].南昌航空大学学报(自然科学版),2011,25:13-17.
[14]刘书芹,袁志山,王江波.热变形对TiNi形状记忆合金丝材力学性能以及超弹性的影响[J].热加工工艺,2007,36(22):21-23.