摘要
针对冷轧技术制备的Ti/Ni叠层材料开展了温度为600~1000℃,保温时间为5~120 min的原位反应试验,利用扫描电镜(SEM),并结合能谱分析(EDS)研究了原位反应温度和保温时间对Ti/Ni叠层材料微观组织和界面成分的影响规律,同时利用电子背散射衍射(EBSD)、X射线衍射(XRD)、透射电镜(TEM)等对Ti/Ni叠层材料原位反应合成的产物进行了微结构和相组成分析。结果表明,Ti/Ni叠层材料经变形量为75%的冷轧后,Ti层与Ni层连续性较好,且Ti/Ni界面未发生扩散反应;当原位反应温度为700℃,保温时间为60 min时,Ti/Ni界面发生了扩散,在界面上形成了Ti_(2)Ni,TiNi和TiNi_(3)相;随着原位反应温度的升高和保温时间的延长,Ti层和Ni层反应加快,Ti_(2)Ni和TiNi_(3)相含量减少,而TiNi相含量增多;当原位反应温度为1000℃,保温时间为60 min时,Ti/Ni叠层材料完全反应生成了单一的TiNi相,原位合成了TiNi合金,其由具有单斜结构的马氏体相(B19′)组成,原子比为51∶49,且晶粒细小,分布均匀。
TiNi shape memory alloy had excellent properties,especially shape memory effect,good corrosion resistance and biocompatibility,making it widely used in aerospace,transportation and bioengineering fields.Recently,the traditional preparation method of TiNi shape memory alloy was casted ingot by vacuum melting,then underwent hot-plastic deformation,and then cold worked and heat treated to achieve the required size and properties.However,the TiNi shape memory alloy had a narrow thermal deformation temperature range and was extremely easy to oxidize.Due to the poor cold rolling performance of TiNi shape memory alloy,the deformation parameters must be strictly controlled,and intermediate annealing treatment must be performed frequently.Traditional preparation methods hindered the further development and application of TiNi shape memory alloy.Pure Ni had a face-centered cubic crystal structure,which had good mechanical and corrosion resistance,and plastic processing performance.While pure Ti had a close-packed hexagonal crystal structure,which had high specific strength and good corrosion resistance.At the same time,the mechanical properties of Ti and Ni were similar.Therefore,the pure Ti plates and pure Ni plates could be stacked sequentially in a certain proportion,and the Ti/Ni laminated materials were formed after plastic deformation,and then the TiNi shape memory alloy were prepared by the solid phase diffusion method.The existing research showed that the TiNi shape memory alloy could be prepared by hot rolling(or hot pressing + cold rolling)combined with heat treatment.Therefore,in this paper,through a multi-pass cold rolling process,the Ti/Ni composite sheet,which was laminated with multiple layers of pure Ti foil and pure Ni foil in sequence,was rolled into a Ti/Ni laminate material.For Ti/Ni laminated material prepared by cold rolling technology,the in-situ reaction experiments were carried out at temperatures of 600~1000 ℃ for holding time of 5~120 min.By using scanning electron microscopy(SEM)and energy dis
作者
张宁
王耀奇
曲海涛
侯红亮
张进涛
Zhang Ning;Wang Yaoqi;Qu Haitao;Hou Hongliang;Zhang Jintao(AVIC Manufacturing Technology Institute,Beijing 100024,China;Aeronautical Key Laboratory for Plastic Forming Technology,Beijing 100024,China;Beijing Key Laboratory of Digital Forming Technology and Equipment,Beijing 100024,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2021年第9期1044-1052,共9页
Chinese Journal of Rare Metals
基金
国家自然科学基金项目(51605457,51334006)
航空科学基金项目(20163625005)资助。
