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논문 기본 정보

자료유형
학술저널
저자정보
M. Farvizi (Materials and Energy Research Center) M. Ghanbariha (Materials and Energy Research Center) A. Faraji (Materials and Energy Research Center)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.12
발행연도
2021.12
수록면
5,407 - 5,424 (18page)
DOI
10.1007/s12540-020-00849-9

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In this study, NiTi-x wt% monoclinic ZrO2(x = 0, 5, and 10) samples were fabricated with spark plasma sintering methodand the role of zirconia microparticles addition on the microstructure, martensitic transformation, and wear behavior ofNiTi?ZrO2 samples was investigated. Microstructural observations using scanning electron microscopy equipped with energydispersive spectroscopy confirmed the formation of Ti?rich regions in NiTi/zirconia interfaces. The evolution of mismatchstress in the composite samples can increase the dislocation density, especially at the interfacial regions. This facilitates thediffusion of titanium from the matrix which leads to the formation of NiTi2phase in the composite samples. According to differentialscanning calorimetry analysis, the martensitic transformation temperatures of zirconia reinforced samples increasesthat shows the higher stability of the martensite phase at room temperature. Rietveld refinement analysis also approved thisfinding. According to wear test results, the wear rate of NiTi sample is 5.74 × 10?3 mm3/N m. However, after the addition of5 wt% ZrO2,the wear rate decreases to 1.49 × 10?3 mm3/N m which confirms the positive effect of zirconia reinforcementson the wear performance of NiTi-based samples. This improvement can be attributed to a better combination of hardnessand pseudoelasticity in this sample.

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