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张由景,程兴旺,周士猛,才鸿年,万明明.Ti2Ni/TiNi微叠层复合材料的制备及表征[J].稀有金属材料与工程(英文),2018,47(1):293~298.[zhangyoujing,chengxingwang,zhoushimeng,caihongnian and wanmingming.Synthesis and Characterization of a Ti2Ni/TiNi Micro-Laminated Composite[J].Rare Metal Materials and Engineering,2018,47(1):293~298.]
Synthesis and Characterization of a Ti2Ni/TiNi Micro-Laminated Composite
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Received:November 16, 2015  Revised:January 25, 2016
DOI:
Key words: micro-laminated composite  Ti2Ni  TiNi  hot pressed sintering
Foundation item:国家自然科学基金资助(项目号51271036)
Author NameAffiliation
zhangyoujing,chengxingwang,zhoushimeng,caihongnian and wanmingming  
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Abstract:
      Using alternatively stacked Ti and Ni foils, a Ti2Ni/TiNi micro-laminated composite was fabricated by hot pressed sintering at 900 oC. The effect of diffusion time on the microstructure and constitutional phases of the composites was investigated. The scanning electron microscope (SEM), electron probe microanalysis (EPMA), X-ray diffraction (XRD) and differential scanning calorimetry (DSC) were employed to analyze the microstructure, constitutional phases, phase structures and phase transition temperatures of the fabricated composites. The results indicate that Ti and Ni foils are gradually consumed with the increase of diffusion time and three intermetallic layers (Ti2Ni, TiNi, Ni3Ti) are produced at the interfaces of Ti/Ni. When Ni foils are completely consumed, Ti atoms diffuse into Ni3Ti layers, tranforming the Ni3Ti layers into TiNi. After Ti foils are completely consumed, only alternatively arranged Ti2Ni and TiNi layers exist. Moreover, there are lots of granular and strip-shaped Ti2Ni phases distributing in the TiNi layers. The As, Af, Ms, Mf and transition hysteresis temperature (ΔT) of the composite fabricated after 8h diffusion are 75.9 oC,99.2 oC,63.6 oC,45.7 oC and 32.5 oC, respectively.