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納米SiO2顆粒增強(qiáng)NiTi基復(fù)合材料的制備及組織性能研究
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湖南省教育廳重點(diǎn)項(xiàng)目 (09A089)；湘潭大學(xué)研究性創(chuàng)新課題項(xiàng)目 (091053003)


Preparation of Nano-SiO2 Particle Reinforced NiTi-Based Composites and Their Microstructure and Mechanical Properties
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    摘要:

    采用等離子燒結(jié)法 (SPS) 制備不同含量(1%~4%，質(zhì)量分?jǐn)?shù))納米SiO2增強(qiáng)NiTi基復(fù)合材料，研究SiO2添加對NiTi-SiO2復(fù)合材料的顯微組織、相變點(diǎn)、力學(xué)性能及斷裂特征的影響。結(jié)果表明，所制備的NiTi-SiO2復(fù)合材料其顯微組織主要由B2-NiTi相、B19'-NiTi相、Ni3Ti相、Ti2Ni相以及SiO2相組成，SiO2顆粒均勻彌散地分布在NiTi基體中。隨SiO2加入量的增加，合金的相變特征溫度，Mf、As和Af 下降，但SiO2的添加量對Ms溫度影響不大。SiO2顆粒對NiTi合金的強(qiáng)化效果明顯，隨顆粒加入量增加，其斷裂方式由韌性斷裂轉(zhuǎn)變?yōu)榇嘈詳嗔选Ｔ?%變形范圍內(nèi)，添加SiO2顆粒的復(fù)合材料具有更高的回復(fù)率，表現(xiàn)出更好的超彈性

    Abstract:

    The nano-SiO2 particle reinforced NiTi matrix composites (SiO2%=1%~4%, mass fraction) were fabricated by Spark Plasma Sintering (SPS) method, and the effects of the contents of SiO2 nano-particles on the microstructure, the phase transformation points, the mechanical properties and the fracture feature were investigated. The results indicate that the microstructures of the composites mainly consist of the phases of B2-NiTi, B19'-NiTi, Ni3Ti, Ti2Ni and SiO2, and the SiO2 particles are evenly dispersed in NiTi matrix. The addition of SiO2 reduces the phase transformation point of Mf, As and Af, but has no strong influence on Ms. The SiO2 particles can obviously improve the strength of NiTi alloy, but with the increase of SiO2 particles, the fracture mode of the alloy changes from ductile fracture to brittle fracture. More over, the composites containing SiO2 exhibit higher deformation recovery and better superelasticity than that of NiTi alloy in the deformation within 6%

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李傳吉,林建國,張德闖,彭柱根,吳昌義.納米SiO2顆粒增強(qiáng)NiTi基復(fù)合材料的制備及組織性能研究[J].稀有金屬材料與工程,2012,41(8):1385~1389.[Li Chuanji, Lin Jianguo, Zhang Dechuang, Peng Zhugen, Wu Changyi. Preparation of Nano-SiO2 Particle Reinforced NiTi-Based Composites and Their Microstructure and Mechanical Properties[J]. Rare Metal Materials and Engineering,2012,41(8):1385~1389.]
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  • 收稿日期:2011-08-06
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