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金属学报  2019, Vol. 55 Issue (6): 701-708    DOI: 10.11900/0412.1961.2018.00347
  本期目录 | 过刊浏览 |
冷轧态Ti-35Nb-2Zr-0.3O合金的异常热膨胀行为
蓝春波1,2,梁家能1,劳远侠1,谭登峰1,黄春艳1,莫羡忠1,庞锦英1()
1. 南宁师范大学化学与材料学院广西天然高分子化学与物理重点实验室 南宁 530001
2. 东南大学材料科学与工程学院 南京 211189
Anomalous Thermal Expansion Behavior of Cold-RolledTi-35Nb-2Zr-0.3O Alloy
Chunbo LAN1,2,Jianeng LIANG1,Yuanxia LAO1,Dengfeng TAN1,Chunyan HUANG1,Xianzhong MO1,Jinying PANG1()
1. Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, College of Chemistry and Materials, Nanning Normal University, Nanning 530001, China
2. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
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摘要: 

采用高真空非自耗电弧熔炼炉对Ti-35Nb-2Zr-0.3O (质量分数,%)合金进行熔炼。运用OM、XRD、SEM、TEM和静态热机械分析仪对Ti-35Nb-2Zr-0.3O合金进行表征,研究冷轧形变对合金显微组织及热膨胀行为的影响。结果表明:Ti-35Nb-2Zr-0.3O合金在冷轧过程中产生应力诱发马氏体α" (stress-induced martensitic α",SIM α")相,并形成平行于轧制方向的强<110>织构。等轴晶组织的Ti-35Nb-2Zr-0.3O合金表现出正常的热膨胀行为。形变后,合金的热膨胀行为出现异常现象,轧制方向表现为负膨胀,负膨胀程度随着形变量的增加而增大,截面方向表现为大于固溶态的正膨胀。30%形变合金的轧制方向在室温到250 ℃具有Invar效应,这一现象归因于SIM α"相变、晶格畸变和<110>织构的形成。冷轧态Ti-35Nb-2Zr-0.3O合金在室温到110 ℃的异常膨胀归因于SIM α"相到β相的晶格转变,而在高于110 ℃的异常膨胀行为归因于ω相和α相的析出。

关键词 Ti-35Nb-2Zr-0.3O合金冷轧显微组织异常热膨胀    
Abstract

Thermal expansion behavior is one of the intrinsic properties of most materials, which is very difficult to control their thermal expansion behavior. Metallic material with ultra-low coefficient of thermal expansion named Invar effect was first found in Fe-Ni alloys. Recently, a multifunctional titanium alloy termed Gum metal (the typical composition is Ti-36Nb-2Ta-3Zr-0.3O, mass fraction, %; three electronic parameters: electron per atom ratio e/a≈4.24, bond order Bo≈2.87 and d electron orbital energy level Md≈2.45 eV) has been developed, and the alloy exhibits Invar effect after severe cold working. It is well known that the Invar effect of Fe-Ni alloys is related to the magnetic transition. However, titanium and its alloys are paramagnetic, and thus this mechanism cannot be used to explain Invar effect of Gum metal. In addition, the Invar effect of Gum metal is related to a dislocation-free plastic deformation mechanism. So far, there is still some controversy about this mechanism. In this study, a new β-type Ti-Nb base alloy Ti-35Nb-2Zr-0.3O (mass fraction, %) was developed whose three electronic parameters are different from those of the above mentioned Gum metal. The alloy was melted under high-purity argon atmosphere in an electric arc furnace, and the effects of cold rolling on microstructures and thermal expansion behaviors were characterized by OM, XRD, SEM, TEM and thermal mechanical analyzer (TMA). Results showed that the stress-induced martensitic α" (SIM α") phase transformation occurs after cold rolling, and the dominant <110> texture forms after severe plastic deformation. The equiaxed grains of Ti-35Nb-2Zr-0.3O alloy exhibit ordinary positive thermal expansion behavior and the thermal expansion rate increases with the increase of temperature. After cold deformation, negative thermal expansion occurs along rolling direction, and normal thermal expansion higher than solution treated sample occurs along transverse direction. The abnormal thermal expansion extent of the alloy increases with the increase of deformation reduction. The 30% cold deformed alloy along rolling direction possesses Invar effect between room temperature to 250 ℃, which is possibly related to SIM α" phase transformation, lattice distortion and <110> texture formation. The anomalous thermal expansion of the cold deformed samples in a temperature range from 25 ℃ to 110 ℃ is attributed to the lattice transition of SIM α" to β phase, while above 110 ℃ is attributed to the precipitation of ω and α phases.

Key wordsTi-35Nb-2Zr-0.3O alloy    cold rolling    microstructure    anomalous thermal expansion
收稿日期: 2018-07-25     
ZTFLH:  TG146  
基金资助:广西自然科学基金项目(Nos.2018GXNSFAA138057);广西自然科学基金项目(2018JJA110055);广西大学广西有色金属及特色材料加工重点实验室开放基金项目(Nos.GXYSOF1802);广西大学广西有色金属及特色材料加工重点实验室开放基金项目(GXYSOF1810)
通讯作者: 庞锦英     E-mail: pangjinying@126.com
Corresponding author: Jinying PANG     E-mail: pangjinying@126.com
作者简介: 蓝春波,男,1985年生,博士

引用本文:

蓝春波,梁家能,劳远侠,谭登峰,黄春艳,莫羡忠,庞锦英. 冷轧态Ti-35Nb-2Zr-0.3O合金的异常热膨胀行为[J]. 金属学报, 2019, 55(6): 701-708.
Chunbo LAN, Jianeng LIANG, Yuanxia LAO, Dengfeng TAN, Chunyan HUANG, Xianzhong MO, Jinying PANG. Anomalous Thermal Expansion Behavior of Cold-RolledTi-35Nb-2Zr-0.3O Alloy. Acta Metall Sin, 2019, 55(6): 701-708.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00347      或      https://www.ams.org.cn/CN/Y2019/V55/I6/701

图1  Ti-35Nb-2Zr-0.3O合金固溶态及不同形变的OM像
图2  固溶态和90%形变Ti-35Nb-2Zr-0.3O合金的反极图
图3  Ti-35Nb-2Zr-0.3O合金在固溶态及不同形变下的XRD谱
图4  固溶态及不同形变量Ti-35Nb-2Zr-0.3O合金的热膨胀曲线
图5  90%形变Ti-35Nb-2Zr-0.3O合金在不同温度下的循环膨胀曲线
图6  90%形变Ti-35Nb-2Zr-0.3O合金在室温至850 ℃的热膨胀曲线和膨胀系数曲线
图7  90%形变Ti-35Nb-2Zr-0.3O合金在300、350和450 ℃时效1 h后显微组织的TEM像及2种不同取向的α相和ω相及[110]β晶带SAED谱的示意图
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