摘要
包含富V相和共晶Ni-Ti化合物的多相V-Ti-Ni合金能够在氢渗透率与氢脆抗性之间达到较好的平衡,在氢气膜分离领域具有广阔的应用前景。但此类合金变形抗力大、易氧化、低温成形困难。本研究对多相V_(60)Ti_(20)Ni_(20)合金进行热处理+电塑性轧制以提高轧制成形性能与效率,降低合金膜制造成本,并利用光学显微镜、扫描电镜、能谱仪、X射线衍射仪及维氏显微硬度计,研究轧制过程中脉冲电流密度对合金显微组织、轧制成形性能和显微硬度的影响规律。研究结果表明:电塑性轧制能够有效提高合金的轧制成形能力,其单道次轧制极限压下量达到13.3%,相较于热处理态合金冷轧成形的增幅达到155%。在电塑性轧制成形过程中,随着脉冲电流密度增加,合金组织变形更加均匀,组织的流变方向一致性较好,而合金的显微硬度随之下降,其原因主要是电致塑性效应在轧制过程中促进了位错运动,从而减少位错的缠结。
Multi-phase V-Ti-Ni alloys containing V-rich phases and eutectic Ni-Ti compounds can achieve a good balance between hydrogen permeability and hydrogen embrittlement resistance,so that they have broad application prospects in the field of hydrogen separation membranes.However,such alloys have large resistance for deformation,easiness to oxidize,and difficulty for low temperature forming.In order to improve the formability and rolling efficiency,and to reduce the manufacturing cost of alloy membranes,heat treatment and electricplastic rolling were carried out for multiphase V60Ti20Ni20 alloy,and then the influence of pulse current density on the microstructure,rollability and microhardness of the alloy during rolling was studied by means of optical microscope,scanning electron microscope,energy spectrometer,X-ray diffractometer and Vickers microhardness tester.The results show that the electricplastic rolling can effectively improve the rollability of the alloy by increasing the single-pass rolling ultimate reduction to 13.3%,which is an increase of 155%compared with that of the cold rolling of heat-treated alloy.During the electroplastic rolling process,as the pulse current density increases,the microstructure of the alloy deforms more uniformly,the rheological direction of the microstructure is more consistent,and the microhardness of the alloy decreases,which is due to the electroplastic effect promotes dislocation movement during rolling process,resulting a reduction of the dislocation entanglement.
作者
黄焕超
刘美娟
孙明
江鹏
Huang Huanchao;Liu Meijuan;Sun Ming;Jiang peng(Changzhou High Technology Research Key Laboratory of Mould Advanced Manufacturing,School of Mechanical Engineeing and Rail Transit,Changzhou University,Changzhou Jiangsu 213164,China;School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2021年第3期153-158,共6页
Heat Treatment of Metals
基金
国家自然科学基金(51705038)
江苏省自然科学基金(BK20150268)
江苏省研究生科研与实践创新计划(KYCX20_2535)
常州市模具先进制造高技术研究重点实验室开放基金(2019-9)。
